Page 1 Internal Use Only Service Manual KF750/KF755c Date: May, 2008 / Issue 1.0...
Page 2: Table Of Contents
12.3 Accessory ..........258 4.12 Charger Trouble Shooting....128 4.13 Checking Bluetooth Block ....131 4.14 RF Component........138 4.15 Procedure to check ......139 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3 - Only for training and service purposes...
Page 4: Introduction
The user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system and may void any remaining warranty. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 5 -...
Page 5 • When returning system boards or parts like EEPROM to the factory, use the protective package as described. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 6 - Only for training and service purposes...
Page 6: Performance
Push Type ( + , - ) Voice Key Push Type External Memory T - Flash Socket I/O Connect 18 Pin Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 7 - Only for training and service purposes...
Page 7: Usable Environment
°C Humidity max. 85 2) Environment (Accessory) Item Spec. Typ. Unit Power Available power * CLA : 12~24V(DC). LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 8 - Only for training and service purposes...
Page 8: Radio Performance
-59dBm 915M~1GHz -57dBm 915M~1GHz -57dBm 1G~1.71GHz -47dBm 1G 1.71GHz -47dBm 1.71G~1.785GHz -53dBm 1.71G~1.785GHz -53dBm 1.785G~4GHz -47dBm 1.785G~4GHz -47dBm Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 9 - Only for training and service purposes...
Page 9 Intermodulation attenuation Frequency offset 800kHz Intermodulation product should be Less than 55dB below the level of Wanted signal LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 10 - Only for training and service purposes...
Page 10 ±4 ±3 ±4 ±5 ±4 ±5 ±4 ±5 ±4 ±5 ±5 ±5 Burst timing Mask IN Mask IN Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 11 - Only for training and service purposes...
Page 11 Occupied Bandwidth(OBW) 5MHz(99%) Spectrum emission Mask -35-15*(∆f-2.5)dBc@∆f=2.5~3.5MHz,30k -35-1*(∆f-3.5)dBc@∆f=3.5~7.5MHz,1M -39- 10*(∆f-7.5)dBc@∆f=7.5~8.5MHz,1M -49dBc@∆f=8.5~12.5MHz,1M Adjacent Channel Leakage Ratio(ACLR) 33dB@5MHz, ACP>-50dBm 43dB@10MHz, ACP>-50dBm LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 12 - Only for training and service purposes...
Page 12 -31dBc@5MHz, Interferer -40dBc -41dBc@10MHz, Interferer -40dBc Error Vector Magnitude (EVM) 17.5%(>-20dBm) (@12.2K, 1DPDCH+1DPCCH) Transmit OFF Power -15dB@SF=4, 768kbps, multi-code transmission Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 13 - Only for training and service purposes...
Page 13 Wanted Signal: -101dBm Wanted Signal: -101dBm (TCH/FS Class II, RBER) Unwanted Signal: Unwanted Signal: Depend on freq. Depend on freq. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 14 - Only for training and service purposes...
Page 14 -46dBm CW@10MHz & -46dBm/3.84MHz@20MHz UE@+20dBm output power(class3) -57dBm@f=9KHz~1GHz, 100k BW Spurious Emissions -47dBm@f=1~12.75GHz, 1M -60dBm@f=1920~1980MHz, 3.84MHz -60dBm@f=2110~2170MHz, 3.84MHz Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 15 - Only for training and service purposes...
Page 15 Out of Band Spurious Emissions Freq.Range Operating Standby 30MHz~1GHz -36dBm -57dBm Above 1GHz~ -30dBm -47dBm 12.75GHz 1.8~1.9GHz -47dBm -47dBm 5.15~5.3GHz -47dBm -47dBm LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 16 - Only for training and service purposes...
Page 16 Intermodluation Performance static sinwave signal at f1=-39dBm a BT modulated signal f2=-39dBm(payload PRBS15) BER ≤ 0.1%@-20dBm Maximum Input Level Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 17 - Only for training and service purposes...
Page 17: Current Consumption
Bar 1 → Icon Blinking 3.40 ± 0.05V Low voltage, warning message 3.40 ± 0.05V Power OFF 3.26 ± 0.05V LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 18 - Only for training and service purposes...
Page 18: Sound Pressure Level
Receiving Distortion (RD) refer to TABLE 30.4 Idle Noise-Sending (INS) -55dBm0p under -45dBPA under Idle Noise-Receiving (INR) -40dBPA under Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 19 - Only for training and service purposes...
Page 19: Charging
(GSM: It should be kept 3.7V in all power level WCDMA: It will not be kept 3.7V in some power level) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 20 - Only for training and service purposes...
Page 20: Technical Brief
Internal Random Access Memory (IRAM) in the EGG core through the AHB. The AHB slave interface allows the CPU and the DMA to access in the program and data RAM residing in the DSPSUB. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 21 -...
Page 21 - External Memory Interface that supports NAND, NOR, PSRAM, SDRAM - JTAG - RTC - ETM (in Prototype Package) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 22 - Only for training and service purposes...
Page 22 + Ant Sw. Transceive r Transceiver < Zoran > To EMP CAM IF Figure 3-1-1 KF750 Block Diagram Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 23 - Only for training and service purposes...
Page 23: External Memory Interface
Er ase speed 1. 5m s 1B l ock=( 128K+4K)Byt es 88M Byt e/ s Figure 3-1-1 KF750 Block Diagram Figure 3- 1- 2. External Memory Configuration of KF750 • Data Communication • Package - IrDA ® (SIR) - 12 by 12 mm 344 balls, 0.5mm pitch...
Page 24: Hardware Architecture
3. TECHNICAL BRIEF 3.1.3 Hardware Architecture A. Block Diagram Figure 3-1-3. Access system of Ericsson DB3150 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 25 - Only for training and service purposes...
Page 25 3. TECHNICAL BRIEF Figure 3-1-4. Application system of Ericsson DB3150 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 26 - Only for training and service purposes...
Page 26 The functional blocks of the Peripheral subsystem connect to the peripheral bus through four separate bridges, which provide a simple interface to support different timing and memory access arrangements. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 27 -...
Page 27 Individual blocks can also be reset and their clocks held inactive by accessing the appropriate control registers. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 28 - Only for training and service purposes...
Page 28 WRX_I_N ADC_I_POS WRX_I_P ADC_Q_NEG WRX_Q_N ADC_Q_POS WRX_Q_P DAC_I_NEG WTX_I_N DAC_I_POS WTX_I_P Figure 3-1-6. Schematic of WCDMA RF Interface Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 29 - Only for training and service purposes...
Page 29: Sim Interface
ACC Transmit Data UART1 APP_GPIO_0 APP_UART_RX APP Receive Data APP_GPIO_1 APP_UART_TX APP Transmit Data Table 3-1-3. UART Interface LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 30 - Only for training and service purposes...
Page 30 ACC_GPIO_21 ACC_GP25_BT_SPI_DAT1 Input ACC_GPIO_22 ACC_GP26_BT_SPI_CLK Output low ACC_GPIO_23 ACC_GP27_AMP_SW_EN Output low Table 3-1-4. Asta ACC GPIO Map Table Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 31 - Only for training and service purposes...
Page 31 FLASH_LED_EN Output low GPIO_8 FLASH_LED_TORCH Output low GPIO_9 FLASH_LED_INH Output low Table 3-1-5. MMIC APP GPIO Map Table LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 32 - Only for training and service purposes...
Page 32 USB_CS_PD USB chip select VBUS Power supply for Asta USB block Table 3-1-6. USB Signal Interface of Asta Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 33 - Only for training and service purposes...
Page 33 USB_DAT_VP USB_DAT0 USB_SE0_VM USB_DAT2 USB_OE Figure 3-1-8. Schematic of Asta USB block Figure 3-1-9. Schematic of USB Transceiver LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 34 - Only for training and service purposes...
Page 34 If a magnet is close to the hall-effect switch U101, the voltage at Pin 4 of U101 goes to 0V. Otherwise 1.8V. This SLIDE_DET signal is delivered to Asta ACC_GP15_FLIPSENSE. Figure 3-1-10. Slider On/Off Detector Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 35 - Only for training and service purposes...
Page 35: Bluetooth Interface
3. TECHNICAL BRIEF 3.1.10 Bluetooth Interface KF750 supports Bluetooth operation using STLC2593C Bluetooth module. A. General Description The Bluetooth interface utilizes the SPI interface for control signals going to and from the Bluetooth module. The SPI is also used for data transmissions.
Page 36 - Power Class 2 and Power Class 1.5 (above 4dBm) - Programmable output power - Power Class 1 compatible Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 37 - Only for training and service purposes...
Page 37 ■ Single power supply with internal regulators for core voltage generation ■ Supports 1.65 to 2.85 Volts IO systems ■ Auto calibration (VCO, Filters) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 38 - Only for training and service purposes...
Page 38 - HCI interface between Asta and STLC2593C • PCM - Audio signal interface between Asta/Veronica and STLC2593C • ANT - 2.4GHz, 50 ohm matching Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 39 - Only for training and service purposes...
Page 39: Microsd Interface Card
3. TECHNICAL BRIEF 3.1.11 MicroSD Interface card KF750 supports the MicroSD card interface as external memory card. MicroSD card has 4-data line, so KF750 uses 4-data line. All control and data line is connected to Asta. Cause of the difference between Asta and MicroSD card, a level shifter should be added.
Page 40: Power On Sequence
Power for Asta Press END key PWRRSTn PWRRST RESPOW_N IRQ0_N ONSWAn IRQ0n ONSWA Figure 3-1-13. Power On Sequence Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 41 - Only for training and service purposes...
Page 41 MULTI SEND KEYOUT2 CAMAF KEYOUT3 CAMSHOT KEYOUT4 HOME Table 3-1-8. Key Matrix Mapping Table Figure 3-1-14. KEY CIRCUIT LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 42 - Only for training and service purposes...
Page 42 3. TECHNICAL BRIEF I2C interface Figure 3-1-15. Touch button and Touch screen connector Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 43 - Only for training and service purposes...
Page 43 EL controller AC generator EL driver EL lighing channel output (connected with EL sheet) Figure 3-1-16. Multi EL lighting LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 44 - Only for training and service purposes...
Page 44: Gam Hardware Subsystem
• GRAPHCON : graphics controller. • PDI/SSI : programmable display interface for parallel/serial displays. • CDI : camera data interface. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 45 - Only for training and service purposes...
Page 45: Block Description
I/O ports. It has a 128 byte program memory, programmable by the CPU, which can store up to 64 instructions. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 46 - Only for training and service purposes...
Page 46 In this case, it must have pull-down to ground. The camera module reset signal is an output to the camera module. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 47 -...
Page 47: Vga Camera
Figure 3-2-2. Camera Interface (DB3150 and Zoran) v i t Figure 3-2-3. 5M Camera Connector(34Pin - Main Board) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 48 - Only for training and service purposes...
Page 49 MMP_CAM_HSYNC 5M_CAM_DATA[8] 5M_CAM_DATA[9] MMP_CAM_PWDN 5M_CAM_DATA[10] 5M_CAM_DATA[11] CAM_VDD_AF_2.8V GND 1 Table 3-2-1. Interface between Main board and 5M camera LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 50 - Only for training and service purposes...
Page 50 APP_I2C_SDA CI_D1 VGA_VDD_1.8V CI_D2 CI_HSYNC CI_D3 CI_VSYNC CI_D4 CI_D7 CI_D5 CI_D6 Table 3-2-2. Interface between VGA Camera Module Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 51 - Only for training and service purposes...
Page 51: Camera Regulator
It controlled by I2C (VGA : 2.8V for analog, 1.8V for I/O, digital) VGA Camera POWER Figure 3-2-7. VGA Camera LDO in SUB PMIC LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 52 - Only for training and service purposes...
Page 52: Main Lcd
LCD Module is connected to multi Key PCB with 37-pin Connector in sub PCB. The LCD is controlled by 8-bit PDI(Parallel Data Interface) in DB3150. Table 3-2-4. LCD module Connector Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 53 -...
Page 53 3. TECHNICAL BRIEF 3.2.6 LCD Module Block diagram Figure 3-2-9. LCD Module Block diagram LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 54 - Only for training and service purposes...
Page 54: Lcd Backlight Illumination
There are 2 WHITE LEDs in Main board backlight circuit, which are driven by LEDC port in ABB (Veronica) and light guide is used for luminance Uniformity Figure 3-2-11. Keypad Backlight LED Interface and Backlight Circuit Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 55 -...
Page 55 If Motion is detected, then interrupt is issued to CPU and CPU read its motion value by I2C(SMB_SDA,SMB_SCL) interface. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 56 - Only for training and service purposes...
Page 56: Audio Part
(PGA). The decoder has a receive volume control. The audio inputs and outputs can be switched to normal or auxiliary ports. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 57 - Only for training and service purposes...
Page 57 3. TECHNICAL BRIEF Figure 3-3-2. Audio Interface Detailed Diagram(Veronica) Figure 3-3-3 . Audio Section scheme LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 58 - Only for training and service purposes...
Page 58: Audio Mode
MIDI Only Lo ud Speaker SPKRP/SPKRN Loud Speaker Mode SPKR/SPKN AUXO1/AUXO2 Headse t Mode Table 3-3-1. Audio Mode Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 59 - Only for training and service purposes...
Page 59: Voice Call
• Loud Speaker / Video Telephony Mode : Veronica SPK Amp → SPKR/N → AUDIO AMP(TPA6205) → Speaker(8Ω) • Headset Mode : Auxiliary audio amplifier → AUXO1/2 → AUDIO AMP(TPA4411) → Head Phone LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 60 - Only for training and service purposes...
Page 60 • Headset Mode : Headset MIC → Veronica Input(AUXI1N/1P) When the headset is inserted, EAR_DETECT_n(Circuit Diagram net Name) converted into low state So, the headset icon is displayed on Main LCD. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 61 -...
Page 61 MIDI : Asta → PCM Decoder → Auxiliary audio amplifier → SPKRP/N Port → AUDIO AMP(TPA6205) → Speaker(8Ω) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 62 - Only for training and service purposes...
Page 62 Figure 3-3-7. MP3 Scheme MP3 function supports PCM 44/48KHz sampling rate.The PCM44/48 RX-path is intended to be used as a audio amp and one speaker. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 63 -...
Page 63: Video Telephony
This section provides a description of the Video Telephony functions. Figure 3-3-8. Video Telephony Scheme Video Telephony Mode has same paths with Loud Speaker Mode. 3.3.8 Audio Main Component There are 4 components in KF750 schematic Diagram. Part Number marked on KF750 Schematic Diagram. ITEM PART NUMBER...
Page 64: Gpadc(General Purpose Adc) And Autoadc2
Reference voltage for PAM GPA4 WRFLOOP Lock inform GPA6 GPA6 Headset detect GPA7 VBACKUP Backup battery Table 3-4-1. GPADC channel spec Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 65 - Only for training and service purposes...
Page 65: Charger Control
VBAT Current sensing input positive CHSENSE- Analog VBAT Current sensing input negative Table 3-5-1. Charger Control channel spec LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 66 - Only for training and service purposes...
Page 66: Fuel Gauge
Fuel gauge current sensing input positive FGSENSE- Analog VBAT Fuel gauge current sensing input negative Table 3-5-2. Fuel Gauge channel spec Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 67 - Only for training and service purposes...
Page 67: Battery Temperature Measurement
Fig 3-5-5. Battery Temperature Measurement Name Type Unused Description BDATA Digital Input/Output Unconnected current output Table 3-5-3 BDATA channel spec LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 68 - Only for training and service purposes...
Page 68: Charging Part
3.58 ~3.20 (V) 100~66 (%) 65~44 (%) 43~25 (%) 24~3 (%) 2~0 (%) Fig. 3-5-7 Battery Block Indication Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 69 - Only for training and service purposes...
Page 69 CCCV algorithm. (Fig.3-5-8) shows the charging voltage(a) and charging current change(b). (a) Charging voltage (b) Charging current Fig 3-5-5. Battery Temperature Measurement LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 70 - Only for training and service purposes...
Page 70 • Under 0 °C : Extended temperature From 0 °C to 45 °C : Normal charging temperature Over 45 °C : Extended temperature Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 71 - Only for training and service purposes...
Page 71: Voltage Regulation
VCORE 1.2V 600mA DB3150 Core ABB_SIM LDO (SIMVCC) SIMVCC 2.85V 50mA SIM card Table. 3-6-1. LDO and Buck LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 72 - Only for training and service purposes...
Page 72: Rf Technical Description
WCDMA part, a GSM, and a RF front-end. Different from other general solutions, the RF front-end of KF750 consists of an antenna switch and an EDGE power amplifier module (PAM).
Page 73: Wcdma Part
DC/DC converter regulates the supply voltage and the bias operation point is controlled by a D/A- converter in the W-CDMA radio circuit. These DACs are controlled through the 3-wire-bus LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 74 - Only for training and service purposes...
Page 74 Once filtered, the zero IF I and Q signals are further amplified with provision of 31 x 1 dB steps and DC offset compensation. The zero IF output buffer provides close rail-to-rail outputs signal. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 75 -...
Page 75 .sinks. current from the loop filter capacitor, thus changing the VCO frequency such that the loop finally gets phase-locked. Figure 3-7-4. WCDMA Transceiver schematic LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 76 - Only for training and service purposes...
Page 76 1920-1980 MHz bandwidth into a single compact package. Figure 3-7-5. SKY77174 Functional Block Diagram Figure 3-7-6. WCDMA PAM schematic Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 77 -...
Page 77 Dual Transfer Mode (DTM) class 9 (3+2=5) Zero-IF receiver • Polar modulation transmitter Figure 3-7-7. GSM Transceiver Architecture LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 78 - Only for training and service purposes...
Page 78 The digital output signals are sent over a serial interface to the digital base- band circuit for further processing and detection. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 79 -...
Page 79 W-CDMA circuit. This output is activated by a control signal in the digital bus. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 80 - Only for training and service purposes...
Page 80 The switch is used only for selecting the W-CDMA mode of operation . the split between transmit and receive frequencies is handled by the W-CDMA duplexer. Figure 3-7-8. Front-End Module Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 81 -...
Page 81 (band 1 or band 2) antenna switch-through via a dedicated UMTS port. Figure 3-7-9. SKY77519 Functional Block Diagram Figure 3-7-10. Front End part schematic LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 82 - Only for training and service purposes...
Page 82 RF system is estimated by a voltage measurement performed by the analog baseband controller. The control flow for the RF system is shown in Figure 3-7-11. Figure 3-7-11. RF Control Flow Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 83 -...
Page 83: Trouble Shooting
VDD_H (C507) 2.75V VDD_F VDD_K(C510) 2.75V VDD_G VDD_LP(C511) 1.5V SWBUCK(L500) 1.2V SWBUCK < MAIN PCB > Change main board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 84 - Only for training and service purposes...
Page 84: Usb Trouble
TP03_BB TP02_BB C600 R619 C600 C601 C601 R619 TP04_BB R603 R603 < Main Board ñ Bottom side > Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 85 - Only for training and service purposes...
Page 85: Sim Detect Trouble
< SOCKET PCB - SIM Conne cto r > Change SIM card SIM work well? Finish Change main board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 86 - Only for training and service purposes...
Page 86: Microsd Card Trouble
PDA MicroSD work well? Change the MicroSD FINISH < Socke tPCB side mic roSD Socket > Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 87 - Only for training and service purposes...
Page 87: Keypad, Touch Button And Touch Screen Trouble
(1) If one of the side key is short with other signal or pressed, some key is not work. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 88 - Only for training and service purposes...
Page 88 RA101 TP05_BB Side key Side key TP07_BB VA101 VA101 ~ VA108 ~ VA108 Main board TP08_BB CN700 CN700 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 89 - Only for training and service purposes...
Page 90 CN702 CN702 FLCD TP09_BB CN106 CN106 TP09_BB CN108 CN108 Multikey TP09_BB CN902 CN902 CN902 TOUCH_SCREEN_SCL TOUCH_SCREEN_SDA TOUCH_SCREEN_INT TOUCH_3.1V Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 91 - Only for training and service purposes...
Page 91 The output must be 3.1V DATA or Clock signal Multikey TOUCH_CONNECTOR TOUCH_3.1V R906 TP12_BB R906 CN901 TP12_BB R907 R907 TOUCH_SCREEN_INT TOUCH_SCREEN_SCL TOUCH_SCREEN_SDA Change Multikey PCB LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 92 - Only for training and service purposes...
Page 92: Multi El Lighting Trouble
4. TROUBLE SHOOTING 4.6 Multi EL lighting Trouble Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 93 - Only for training and service purposes...
Page 93 CN702 CN702 FLCD TP13_BB CN106 CN106 TP13_BB CN108 CN108 Multikey TP13_BB CN902 CN902 CN902 TOUCH_SCREEN_SCL TOUCH_SCREEN_SDA TOUCH_SCREEN_INT TOUCH_3.1V LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 94 - Only for training and service purposes...
Page 94 The output must be 3.1V DATA or Clock signal Main Board U400 TP16_BB U400 output output The output must be 6.1V DC. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 95 - Only for training and service purposes...
Page 95 D1 D2 D3 D4 Q900 SIA450DJ C903 470pF S1 S2 R912 C905 C906 150p 0.1u 100K Replace U900 Replace U900 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 96 - Only for training and service purposes...
Page 96: Camera Trouble
Change U703 or Change U702 C722 = 2.8V? Change 5M Camera 5M Camera Works Change the Main Board Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 97 - Only for training and service purposes...
Page 97 4. TROUBLE SHOOTING CN701 Camera 34pin 5M Camera Connector in Main Board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 98 - Only for training and service purposes...
Page 98 TP19_BB(2.8V) TP 2 Camera Camera 5M Regulator in Main Board (Bottom) 5M Regulator in Main Board (Top) TP19_BB Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 99 - Only for training and service purposes...
Page 99: Vga Camera
Change the Camera&LCD FPCB or Soket PCB VGA Camera Operation OK? VGA Camera Works Change the Main Board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 100 - Only for training and service purposes...
Page 100 4. TROUBLE SHOOTING CN702 CN104 Main Board 80 pin BtoB Connector LCD FPCB 20 pin VGA Connector Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 101 - Only for training and service purposes...
Page 101 4. TROUBLE SHOOTING TP21_BB TP 2 TP20_BB C922 TP20_BB (1.8V) U903 TP21_BB (2.8V) C921 Charge Pump in Socket Board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 102 - Only for training and service purposes...
Page 102: Main Lcd Trouble
Change LCD FPCB or Multikey PCB Change LCD Module The LCD Works LCD Display OK? Change the Main Board Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 103 - Only for training and service purposes...
Page 103 LCD FPCB 44 pin BtoB Connector Main Board 80 pin BtoB Connector CN902 CN900 Multikey PCB 44pin & 37pin LCD Connector LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 104 - Only for training and service purposes...
Page 104: Keypad Backlight Trouble
Keypad Backlight Works? Change Main Board Crack Mainkey PCB to main board Change Mainkey PCB Keypad Backlight Works Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 105 - Only for training and service purposes...
Page 105 4. TROUBLE SHOOTING TP22_BB TP23_BB TP24_BB R102 R101 TP24_BB TP23_BB TP22_BB LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 106 - Only for training and service purposes...
Page 106: Folder On/Off Trouble
Pin 1 of U101 = 2.75V board Crack Mainkey P CB Change Mainkey PCB Slide OK? Change Main board Finish Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 107 - Only for training and service purposes...
Page 107 4. TROUBLE SHOOTING TP25_BB U101 TP25_BB (2.75V) Be sure that magnet is here LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 108 - Only for training and service purposes...
Page 108: Audio Trouble Shooting
Note: It is recommended that engineer should check the soldering of R, L, C along the • corresponding path before every step. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 109 - Only for training and service purposes...
Page 109 LCD FPCB sus Can you hear sine wave Change the Receiver out of the receiver ? LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 110 - Only for training and service purposes...
Page 110 4. TROUBLE SHOOTING TP26_BB R518, R519 TP27_BB Pin 65, 66 CN702 LCD FPCB TP28_BB Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 111 - Only for training and service purposes...
Page 112 TP26_BB R518, R519 TP27_BB Pin 65, 66 Measured 1khz Sine Wave Signal TP28_BB Measured 1khz Sine Wave Signal Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 113 - Only for training and service purposes...
Page 113 Note: It is recommanded that engineer should check the soldering of R, L, C along the • corresponding path before every step. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 114 - Only for training and service purposes...
Page 114 EAR(+) PAD in LCD FPCB? Change the LCD FPCB Can you hear sine wave Change the Speaker out of a speaker ? Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 115 - Only for training and service purposes...
Page 115 4. TROUBLE SHOOTING TP31_BB TP29_BB U501 C531, c532 B SIDE TP30_BB U500 TP32_BB LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 116 - Only for training and service purposes...
Page 116 4. TROUBLE SHOOTING TP30_BB U500 TP31_BB TP29_BB U501 C531, c532 Measured 1khz Sine Wave Signal Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 117 - Only for training and service purposes...
Page 117 - C104 on mainkey PCB → - C106, C108 on mainkey PCB → - R103, R104 on mainkey PCB → - Veronoca → LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 118 - Only for training and service purposes...
Page 118 If fail again, chage the main Bíd Change the MIC Change the main B,d Does it work properly ? Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 119 - Only for training and service purposes...
Page 119 TP33_BB C106, C108 TP32_BB C104 TP32_BB C104 TP33_BB C106, C108 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 120 - Only for training and service purposes...
Page 121 Headset Can you hear sine wave Change the main Bíd out of the receiver ? LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 122 - Only for training and service purposes...
Page 122 4. TROUBLE SHOOTING TP38_BB FB600, FB601 TP39_BB R816, R817 TP35_BB C613, C614 TP37_BB FL601 TP36_BB TP40_BB R620 CN600 TP34_BB R621 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 123 - Only for training and service purposes...
Page 123 TP38_BB FB600, FB601 TP39_BB TP39_BB R816, R817 R816, R817 TP35_BB C613, C614 TP34_BB TP36_BB R621 R620 TP40_BB CN600 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 124 - Only for training and service purposes...
Page 124 Change the main Bíd at U803 ? Change the main Bíd Does it work properly ?? Try again from the start Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 125 - Only for training and service purposes...
Page 127: Charger Trouble Shooting
• - Check the charger connecter - Check the Charging current Path: Red Line( - Check the battery LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 128 - Only for training and service purposes...
Page 128 Is it charging properly Is it charging properly after changing Q500? Change the board Change the board Trouble Shooting - Charging Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 129 - Only for training and service purposes...
Page 129 4. TROUBLE SHOOTING l a i l a i Q501 Main Battery Charging Path LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 130 - Only for training and service purposes...
Page 130: Checking Bluetooth Block
<Bottom view> <Top view> start 1. Check PMIC Block 2. Check BT IC Block ** BT - Bluetooth Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 131 - Only for training and service purposes...
Page 131 BT ANT pad BT IC 2.75V(C810) BT CLK(R803) 2.75V(C809) PMIC <BT IC Block> <Bottom view> 1.8V(C503) 2.75V(C510) <PMIC Block> LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 132 - Only for training and service purposes...
Page 132 4. TROUBLE SHOOTING 4.13.1 Checking BT IC Block TP02_BT TP01_BT 1.8V(C503) 2.75V(C510) TP02_BT 1.8V(C503) TP01_BT 2.75V(C510) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 133 - Only for training and service purposes...
Page 133 Oscilloscope 2.75V? voltage level at C503 Check About Check Veronica (U502) 1.8V? with Oscilloscope Check Next Stage LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 134 - Only for training and service purposes...
Page 134 4.13.2 Checking BT IC Block TP05_BT TP06_BT 1.8V(C804) 2.75V(C808) TP04_BT TP07_BT TP03_BT 2.75V(C810) BT CLK(R803) 2.75V(C809) TP04_BT 2.75V(C810) TP03_BT 2.75V(C809) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 135 - Only for training and service purposes...
Page 135 4. TROUBLE SHOOTING TP05_BT 1.8V(C804) TP06_BT 2.75V(C808) TP07_BT BT CLK(R803) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 136 - Only for training and service purposes...
Page 136 BT IC Output (C803) Change BT Chip (U801) -2 ~ 2dBm ? with Spectrum Analyzer Check Next Stage Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 137 - Only for training and service purposes...
Page 137: Rf Component
RF Test Connector FL200 WCDMA Rx SAW Filter SW101 Antenna Connector FL201 WCDMA Tx SAW Filter FL202 WCDMA Duplexer LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 138 - Only for training and service purposes...
Page 138: Procedure To Check
Agillent 8960 : Test mode(GSM) Ch. 62, P.L. 7 level setting Ch. 62, -60dBm setting 5. Check GSM Block Redownload SW, Cal Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 139 - Only for training and service purposes...
Page 139: Checking Common Power Source Block
GSM PAM Block (Top) Step 4 Checking VCC Step 1 Power Source Block (Bottom) Figure 4-2. Common Source Block LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 140 - Only for training and service purposes...
Page 140 Short? Change Board From CN500 to C517 Soldering Check Component (CN500) In Power Source Block Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 141 - Only for training and service purposes...
Page 141 From C517 to C102, C103 Soldering Check Component (CN500) In Power Source Block LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 142 - Only for training and service purposes...
Page 142 From C517 to C201, C202 Soldering Check Component (CN500) In Power Source Block Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 143 - Only for training and service purposes...
Page 143 Check Point 1.8V OK? Check the AB3000 VDD_E (C503) Common Input Power is OK See The Next Part LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 144 - Only for training and service purposes...
Page 144: Checking Vcxo Block
Figure 4-6. VCXO block Notebook to send TP command Oscilloscope Phone Figure 4-7. Connection for Checking VCXO Block Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 145 - Only for training and service purposes...
Page 145 Figure 4-8-1. Test Point (Crystal Part) TP07_RF R113 Figure 4-8-2. Schematic (Crystal Part) Figure 4-9. 26MHz at R113 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 146 - Only for training and service purposes...
Page 146 Figure 4-10-1. Test point (26MHz at TX part) TP08_RF C229 Figure 4-10-2. Schematic (26MHz at TX part) Figure 4-11. 26MHz at C229 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 147 - Only for training and service purposes...
Page 147 Baseband (DB3150) TP09_RF R114 MCLK MCLK Figure 4-12-2. Schematic (26MHz at BB Part) Figure 4-13. 26MHz at R114 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 148 - Only for training and service purposes...
Page 148 Refer to Figure 4-10 Changing XTAL or U102 26MHz at MCLK VCXO part is O.K. Check next stage Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 149 - Only for training and service purposes...
Page 149: Checking Front End Module Block
(+ GSM/EDGE PA) Figure 4-12. Front End Module Block (Bottom and Top) TP10_RF Antenna Switch Module (+ GSM/EDGE PA) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 150 - Only for training and service purposes...
Page 150: Checking Front End Module Block Input Logic
4. TROUBLE SHOOTING 4.19 Checking Front End Module Block input logic 4.19.1 Mode Logic by TP Command Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 151 - Only for training and service purposes...
Page 151 EGSM Tx DCS Tx PCS Tx EGSM Rx DCS Rx PCS Rx WCDMA Table 4-1. Front End module Logic LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 152 - Only for training and service purposes...
Page 152 Resoldering Check ANTSW0(C104) To check Switch input power source Check each mode Change the Board By TP command Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 153 - Only for training and service purposes...
Page 153: Checking Wcdma Block
PAM Block SW100 RF switch 6. Check RF RX Level (Bottom) Re-download SW, Cal Figure 4-27. WCDMA Block LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 154 - Only for training and service purposes...
Page 154: Checking Control Signal
First of all, control signal should be checked. (data, clk, strobe) PIN14 (STROBE) PIN13 (CLK) PIN12 (DATA) U203 WCDMA Transceiver (RF3100) Figure 4-28-1. Test points (Control Signal) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 155 - Only for training and service purposes...
Page 155 Figure 4-28-2. Schematic (Control Signal) Notebook to send TP command Oscilloscope Phone Figure 4-29. Connection for Checking Control Signal LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 156 - Only for training and service purposes...
Page 156 If signal is not OK even after downloading, Change the U203 Control Signal is O.K. Check next stage Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 157 - Only for training and service purposes...
Page 157: Checking Rf Tx Level
Figure 4-31. Test point (RF TX Level) Notebook to send TP command Spectrum Analyzer Phone Fig. 4-32 Connection for Checking RF TX Level LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 158 - Only for training and service purposes...
Page 158 FEM Output TP14_RF C226 Duplexer Output TP17_RF C207 PAM Input TP16_RF TP15_RF IS200 IS200 Isolator Input Isolator Output Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 159 - Only for training and service purposes...
Page 159 Fig. 4-33-3 Output Level at Duplexer Fig. 4-33-3 Output Level at Duplexer Fig. 4-33-4 Output Level at Isolator (C226) (C226) Output (IS200.2.Out ) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 160 - Only for training and service purposes...
Page 160 Fig. 4-33-6 Output Level at PAM Input (IS200.3. In) (C207) Fig. 4-33-7 Output Level at RF3100(Ylva) Output (C218) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 161 - Only for training and service purposes...
Page 161 Refer to Figure 4-33-6 You have to check PAM block. The U203 will be not operated. Change the board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 162 - Only for training and service purposes...
Page 162: Checking Pam Block
DC/DC converter TP18_RF Duplexer Output Duplexer Output (C226) (C226) Figure 4-34. Test points of WCDMA TX PAM block Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 163 - Only for training and service purposes...
Page 163 4. TROUBLE SHOOTING TP18_RF Duplexer Output (C226) TP20_RF WPA_BIAS (C206) TP19_RF PAM Input (C207) TP21_RF VCC_PA (C212) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 164 - Only for training and service purposes...
Page 164 Check C212 Change 3.2V ? To Check PAM VCC the DC/DC BIAS from DC/DC converter (VCC_PA) Change The PAM Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 165 - Only for training and service purposes...
Page 165 To verify the RX path you have to check the pk-pk level and the shape of the RX I,Q. TP22_RF WRX_Q_ WRX_Q_ WRX_I_N WRX_I_P N(R205) P(R206) (R207) (R208) WCDMA Transceiver (RF3100) Figure 4-35. RF3100, WCDMA Transceiver LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 166 - Only for training and service purposes...
Page 166 4. TROUBLE SHOOTING Figure 4-36-1. RX I,Q signal (CW:2142MHz) Figure 4-36-2. RX I, Q signal Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 167 - Only for training and service purposes...
Page 167 Verify whether the signal was similar as Figure Change RF3100 (U203) Similar? 4-36-2 with Oscilloscope. Check Next Stage LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 168 - Only for training and service purposes...
Page 168: Checking Gsm Block
RF TX Path SW100 RF switch 6. Check RF RX Path (Bottom) Re-download SW, Cal Figure 4-13. GSM Block Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 169 - Only for training and service purposes...
Page 169: Checking Regulator Circuit
Refer to 4.18 Checking Ant. SW Module IF you already check this point while checking Ant. SW module (4.18), You can skip this test. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 170 - Only for training and service purposes...
Page 170 SWTX=1,64,7 RF_CTRL_CLK (PIN8) RF_CTRL_DAT A(PIN7) RF_CTRL_STR B (PIN6) RF3000 Figure 4-14. Test points of RF control signals TP22_RF Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 171 - Only for training and service purposes...
Page 171 Refer to Figure 4-15 Short? Similar? Re-download SW Change the board Control signal is OK. See next page to check LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 172 - Only for training and service purposes...
Page 172: Checking Rf Tx Path
4. TROUBLE SHOOTING 4.21.5 Checking RF Tx Path A. GSM Tx path Level Figure 4-16. GSM/DCS/PCS Tx Path Level Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 173 - Only for training and service purposes...
Page 173 4. TROUBLE SHOOTING U102 RF3000 U100 GSM/EDGE (+Ant. SW) (Top) (Bottom) Figure 4-17. Test Points of GSM/DCS/PCS Tx Path LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 174 - Only for training and service purposes...
Page 174 4. TROUBLE SHOOTING B. GSM Tx Output Level Check TP23_RF SW100 RF test connector (Bottom) TP23_RF SW100 RF test connector Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 175 - Only for training and service purposes...
Page 175 Refer to Figure 4-42. Similar? GSM900>32dBm DCS>29dBm PCS>29dBm GSM900/DCS/PCS Tx path OK. See Chapter 4.8.6 to check Rx path LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 176 - Only for training and service purposes...
Page 176 Check GSM RF Transceiver GSM900/DCS/PCS Redownload SW Output power at >5dBm See Next page to check Tx path Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 177 - Only for training and service purposes...
Page 177 (Bottom) Figure 4-20. Test points of GSM900/DCS/PCS Tx TP25_RF Vapc (U100 pin 25) TP26_RF GSM900/DCFS/PCS PAM Output (C107) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 178 - Only for training and service purposes...
Page 178 Changing GSM PAM GSM900/DCS/PCS PAM DCS: 31.0dBm (U100) output power at GSM Tx path OK. See Next page to check Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 179 - Only for training and service purposes...
Page 179: Checking Rf Rx Path
GSM900 : -51.5dBm GSM900 : -50dBm DCS : -50dBm PCS : -50dBM Figure 4-21. GSM/DCS/PCS Rx Path Level LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 180 - Only for training and service purposes...
Page 180 Agilent 8960 Setting CW Mode GSM900 : -50dBm@Ch65(948MHz) DCS : -50dBm@Ch700(1842.8MHz) PCS : -50dBm@Ch700(1967.8MHz) v Oscilloscope Setting Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 181 - Only for training and service purposes...
Page 181 GSM/EDGE PA U100 Figure 4-23. Test Points of GSM900/DCS/PCS Rx DCS Rx PCS Rx (C112) (C114) GSM Rx (C120) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 182 - Only for training and service purposes...
Page 182 PCS : -50dBm@ch700(1967.8MHz) Check GSM900/DCS/PCS Rx signal level at GSM900:-51.5dBm Change Ant. SW module DCS/PCS:-51.7dBm (U100) GSM Rx path OK. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 183 - Only for training and service purposes...
Page 183: Download
Select Model DLL. • Download Configuration Setup DLL configuration. • DLL Information Show DLL configuration information what is selected. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 184 - Only for training and service purposes...
Page 184 Unchcked, use fixed USB port. You should assign port number with USB Address. • Image Files Select Image binary files. • GDFS File Select GDFS files. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 185 - Only for training and service purposes...
Page 185: Download
• Close all preference dialog and select Start Button on main page. • Connect phone and wait until download finished. * Usage fixed USB port LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 186 - Only for training and service purposes...
Page 186 • Check USB Address which is loaded. • Do 2 again. • After assign all ports, press save dialog. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 187 - Only for training and service purposes...
Page 187: Block Diagram
U102(Gimly) U100 Test Conn. SW100 Crystal -26M X100 Bluetooth Antenna STLC2593C Bluetooth U801 Figure 5-1. RF Block Diagram LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 188 - Only for training and service purposes...
Page 188 Filter FL100 SAFEB1G84 FA0F00 Filter U301 DB3150 Modem Bluetooth U801 STLC2593 Blu etooth Table 5-1. RF Block Component Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 189 - Only for training and service purposes...
Page 199 HV_OUT_5 TP906 HVOUT4 HV_OUT_4 TP907 HVOUT3 HV_OUT_3 HVOUT2 HV_OUT_2 TOUCH_BUTTON_SCL HVOUT1 TOUCH_BUTTON_SDA ISSP TOUCH_SCREEN_SCL VBIAS TOUCH_SCREEN_SDA C907 0.1u LGE Internal Use Only - 200 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 202: Bgm Pin Map
8. BGM Pin Map 8. BGM Pin Map DBB IC : DB3150 R3A (top view) Don't Use Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 203 - Only for training and service purposes...
Page 204 8. BGM Pin Map Memory IC : KAL00900BM-DJ55 (top view) Don't Use Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 205 - Only for training and service purposes...
Page 208: Pcb Layout
Check the freq. 27MHz <GSM PA + ASM> <DC/DC for PA> Tx amplifier and antenna WCDMA Tx operation switch operation Copyright © 2008 LG Electronics. Inc. All right reserved. - 209 - LGE Internal Use Only Only for training and service purposes...
Page 209 UART/Charging operation Check output of LDO Check audio path <MiainKey Connector> Numeric Key & SideKey <Battery Connector> Power supply LGE Internal Use Only - 210 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 211 <Motor operating IC> u-SD card level shifter Motor operation <u-SD card socket> <SIM socket> Socket soldering Socket soldering LGE Internal Use Only - 212 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 213 <LCD connector> LCD operation <EL driver IC> EL operation <Touch Connector> Touch operation <EL operating IC> EL operation LGE Internal Use Only - 214 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 214 Number & sidekey operation <Touch&Multi sidekey> <MainKey LED> MainKey backlight <CAM sidekey> Camera operation <Hall IC> Slide detect <Mic> Voice input Copyright © 2007 LG Electronics. Inc. All right reserved. - 215 - LGE Internal Use Only Only for training and service purposes...
Page 216 Speaker operation ALC operation <FPCB Connector> LCD assembly status Connector combination <FPCB connector> LCD assembly status Connector combination Copyright © 2007 LG Electronics. Inc. All right reserved. - 217 - LGE Internal Use Only Only for training and service purposes...
Page 218: Calibration & Rf Auto Test Program (Hot Kimchi)
10. Calibration 10. Calibration 10.1 General Description This document describes the installation and software usage for the calibration of LG°Øs GSM/GPRS/EDGE/WCDMA Multimedia Mobile Phone. The calibration menu and it°Øs result is displayed in PC terminal by Mobile phone. 10.2 Environment 10.2.1 H/W Environment...
Page 219: Calibration Environment
Parameter Unit °C Temperature Relative Humidity Vbatt Supply current Table 10-1. Nominal Environmental Test Conditions LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 220 - Only for training and service purposes...
Page 220: Program Operation
- Calibration of EGSM 900, DCS 1800, PCS1900, and WCDMA - Instrument (Agilent8960, Tektronix PS2521G) control - UART communication with mobile phone Figure 10-2. Hot Kimchi Window Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 221 - Only for training and service purposes...
Page 221 10. Calibration 10.4.2 Setting Select a ezlooks Select Off-line in the EZLOOKS MODE. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 222 - Only for training and service purposes...
Page 222 10. Calibration Select a Line System Select Manual in the RUN MODE. Select your com port appropriately. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 223 - Only for training and service purposes...
Page 223 3. CAL + AUTO Select your com port appropriately. MONitor Port is to communicate with 2.5G mobile phone LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 224 - Only for training and service purposes...
Page 224: Calibration Procedure
10. Calibration 10.4.3 Calibration Procedure Select a model name - KF750. Click the START button. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 225 - Only for training and service purposes...
Page 225: Stand-Alone Test
11. Stand-alone Test 11.1 General Description 1) General Description This document describes the installation and software usage for the stand-alone test of LG’s GSM/GPRS/EDGE/WCDMA Mobile Phone. The test menu and it’s result is displayed in PC terminal by Mobile phone.
Page 226: Program Operation
- Command window which supports interactive ITP commands like Hyper terminal - Calibration tree window - Quick Command mode window Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 227 - Only for training and service purposes...
Page 227 - INSTRUMENT : Control and view instrument connection status. See figure 9-5 - PC SETTING : Control and view UART connection status. See figure 9-6 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 228 - Only for training and service purposes...
Page 228 When it will occur power-on, it automatically start ITP running. XCALMON ITP Starting Window (Using Production Loader) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 229 -...
Page 229: Stand-Alone Test
“KF750_KT520_20080412.prfl” If the ITP will operate normally, you should see the characters “TP, OK” in ITP command window like 12-2 A. Loader downloading LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 230 - Only for training and service purposes...
Page 230 D. RF operation You can select Rx or Tx. If you select all item and click test, you can find out result “pass or fail”. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 231 -...
Page 232: Exploded View & Replacement Part List
12. EXPLODED VIEW & REPLACEMENT PART LIST 12.1 EXPLODED VIEW 58 59 60 61 Copyright © 2008 LG Electronics. Inc. All right reserved. - 233 - LGE Internal Use Only Only for training and service purposes...
Page 234: Replacement Parts
COMPLEX, (empty), , , , , Without Color MTAC00 TAPE,SHIELD MTAC0071601 COMPLEX, (empty), , , , , Gold ACGQ00 COVER ASSY,SLIDE ACGQ0023401 Black Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 235 - Only for training and service purposes...
Page 235 MKAG0006201 COMPLEX, (empty), , , , , Black MLAZ00 LABEL MLAZ0038303 PRINTING, (empty), , , , , White LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 236 - Only for training and service purposes...
Page 236 MCBA0027801 PRESS, STS, , , , , Without Color MLAZ00 LABEL MLAZ0038301 PID Label 4 Array Without Color Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 237 - Only for training and service purposes...
Page 237: Main Component
CAP,TANTAL,CHIP ECTH0002201 10 uF,6.3V ,M ,STD ,1608 ,R/TP C105 CAP,CERAMIC,CHIP ECCH0000122 47 pF,50V,J,NP0,TC,1005,R/TP C106 CAP,CERAMIC,CHIP ECCH0000163 47 nF,10V,K,X5R,HD,1005,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 238 - Only for training and service purposes...
Page 238 ECCH0009101 0.1 uF,6.3V ,K ,X5R ,TC ,0603 ,R/TP C902 CAP,CERAMIC,CHIP ECCH0000198 2.2 uF,6.3V ,M ,X5R ,TC ,1005 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 239 - Only for training and service purposes...
Page 239 QFN ,32 ,R/TP ,S/W ic for EL, 5x5x1T ,; ,IC,BiCMOS Cap sense Inputs device ,32 PIN,R/TP ,5*5 Capsense U901 EUSY0277001 TrackPad LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 240 - Only for training and service purposes...
Page 240 VA905 VARISTOR SEVY0004101 5.6 V, ,SMD ,360pF, 1005 VA906 VARISTOR SEVY0004101 5.6 V, ,SMD ,360pF, 1005 FR-4 ,0.5 mm,BUILD-UP 6 ,KF750 MULTIKEY PCB ,; , , , SPJY00 PCB,SUB SPJY0046501 , , , , , , SJMY00 VIBRATOR,MOTOR SJMY0006508 3 V,.08 A,10*3.45 ,17mm , ,3V , , ,12500 , , , ,38...
Page 241 VMN2 ,30 V,100 mA,R/TP ,1.0x0.6 ,; , , , , , , ,[empty] R935 DIODE,SWITCHING EDSY0018101 ,[empty] ,2P ,1 R936 RES,CHIP,MAKER ERHZ0000401 0 ohm,1/16W ,J ,1005 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 242 - Only for training and service purposes...
Page 242 ECCH0004904 1 uF,6.3V ,K ,X5R ,TC ,1005 ,R/TP C303 CAP,CERAMIC,CHIP ECCH0009101 0.1 uF,6.3V ,K ,X5R ,TC ,0603 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 243 - Only for training and service purposes...
Page 243 ECCH0004904 1 uF,6.3V ,K ,X5R ,TC ,1005 ,R/TP C502 CAP,CERAMIC,CHIP ECCH0004904 1 uF,6.3V ,K ,X5R ,TC ,1005 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 244 - Only for training and service purposes...
Page 244 ECCH0007802 4.7 uF,10V ,M ,X5R ,TC ,1608 ,R/TP C602 CAP,CERAMIC,CHIP ECCH0006201 4.7 uF,6.3V ,K ,X5R ,TC ,1608 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 245 - Only for training and service purposes...
Page 245 ECCH0009101 0.1 uF,6.3V ,K ,X5R ,TC ,0603 ,R/TP C808 CAP,CHIP,MAKER ECZH0003103 0.1 uF,10V ,K ,X7R ,HD ,1005 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 246 - Only for training and service purposes...
Page 246 SMD ,SMD ,18 V,4ch. EMI_ESD Filter (10 Ohm,7.5pF) FL800 FILTER,SAW SFSY0027301 2450 MHz,2.0*1.5*1.0 ,SMD ,Pb-free_B/T_SAW L400 INDUCTOR,SMD,POWER ELCP0006703 10 uH,M ,3.2*2.6*1.0 ,R/TP , Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 247 - Only for training and service purposes...
Page 247 5100 ohm,1/16W ,F ,1005 ,R/TP R500 RES,CHIP ERHY0009506 100 Kohm,1/20W(0.05W) ,J ,0603 ,R/TP R501 RES,CHIP ERHY0009503 100 ohm,1/20W(0.05W) ,J ,0603 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 248 - Only for training and service purposes...
Page 248 47 Kohm,1/16W ,J ,1005 ,R/TP R610 RES,CHIP ERHY0009541 470 ohm,1/20W(0.05W) ,F ,0603 ,R/TP R612 RES,CHIP ERHY0009541 470 ohm,1/20W(0.05W) ,F ,0603 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 249 - Only for training and service purposes...
Page 249 2.2 Kohm,1/20W(0.05W) ,J ,0603 ,R/TP ,SMD , dB,H=1.85 ,; ,3.00MM ,STRAIGHT ,RF ADAPTER SW100 CONN,RF SWITCH ENWY0005301 ,SMD ,R/TP ,AU , , LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 250 - Only for training and service purposes...
Page 250 ECCH0009216 22 pF,25V ,J ,X7R ,TC ,0603 ,R/TP C101 CAP,CERAMIC,CHIP ECCH0009106 10 nF,16V ,K ,X7R ,TC ,0603 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 251 - Only for training and service purposes...
Page 251 56 pF,50V ,J ,NP0 ,TC ,1005 ,R/TP C219 CAP,CERAMIC,CHIP ECCH0000161 33 nF,16V,K,X7R,HD,1005,R/TP C224 CAP,CERAMIC,CHIP ECCH0000185 5.6 pF,50V ,C ,NP0 ,TC ,1005 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 252 - Only for training and service purposes...
Page 252 ECCH0004904 1 uF,6.3V ,K ,X5R ,TC ,1005 ,R/TP C723 CAP,CERAMIC,CHIP ECCH0004904 1 uF,6.3V ,K ,X5R ,TC ,1005 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 253 - Only for training and service purposes...
Page 253 18 ohm,1/16W ,J ,1005 ,R/TP R103 RES,CHIP,MAKER ERHZ0000458 300 ohm,1/16W ,J ,1005 ,R/TP R104 RES,CHIP,MAKER ERHZ0000458 300 ohm,1/16W ,J ,1005 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 254 - Only for training and service purposes...
Page 254 R428 RES,CHIP ERHY0009527 47 Kohm,1/20W(0.05W) ,J ,0603 ,R/TP R429 RES,CHIP ERHY0000289 270K ohm,1/16W,J,1005,R/TP PCB ASSY,MAIN,PAD R430 SAFP0000501 SHORT Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 255 - Only for training and service purposes...
Page 255 R815 SAFP0000501 SHORT SC100 FRAME,SHIELD MFEA0021501 PRESS, STS, , , , , Without Color FR-4 ,0.8 mm,LX-BUMP 10 ,KF750 AMP MAIN PCB ,; , , SPFY00 PCB,MAIN SPFY0174201 , , , , , , , U100 RF MODULE,HANDSET SMRH0004201 MHz, MHz,QUAD EDGE 6x6 ,EMP U300 Tx Module...
Page 256 Desciption Part Number Spec Color Remark CMOS ,MEGA ,5M AF [Micron 1/3.2", MI5130, Parallel, SVCY00 CAMERA SVCY0017001 FPCB] Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 257 - Only for training and service purposes...
Page 257: Accessory
100-240V ,5060 Hz,5.1 V,0.7 A,CE ,18pin, UK, Viewty ADAPTOR,AC-DC SSAD0025004 packing ,; , ,5.1V ,0.7A , , ,WALL 2P ,I/O CONNECTOR , LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 258 - Only for training and service purposes...
Page 258 Note...
Page 259 Note...

This manual is also suitable for:

Kf755c

LG KF750 Service Manual

1 Introduction

2 Performance

3 Technical Brief

4 Trouble Shooting

5 Download

6 Block Diagram

7 Circuit Diagram

8 BGM Pin Map

9 Pcb Layout

10 Calibration & RF Auto Test Program (Hot Kimchi)

11 Stand-Alone Test

12 Exploded View & Replacement Part List

Quick Links

Troubleshooting

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Summary of Contents for LG KF750

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Table of Contents