LG PX8700 Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Telephone
  5. PX8700
  6. Service manual
LG PX8700 Service Manual

LG PX8700 Service Manual

Tri band cdma pcs/cellular/gps mobile phone
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Features of PX8700
1. Wave Type
• CELLULAR : G7W
• PCS : G7W
2. Frequency Scope
Transmit Frequency (MHz)
CELLULAR
824.82 ~ 848.19
3. Rated Output Power : CELLULAR = 0.20W
4. Output Conversion Method : This is possible by correcting the key board channel.
5. Voltage and Current Value of Termination Part Amplifier (Catalogue included)
MODE
CELLULAR
PCS
6. Functions of Major Semi-Conductors
Classification
MSM6550
Memory MCP
(HYI0UGG0MF1P-6SS0E)
RFR6500
RFT6150
7. Frequency Stability
• CELLULAR : ±0.5PPM
• PCS : ±0.1PPM
LG Electronics Inc.
PCS
1850~1910
PCS = 0.20W
Part Name
Voltage
AWT6310R
AWT6310R
Terminal operation control and digital signal processing
Flash Memory (1Mbit) + SDRAM (512Mbit)
Storing of terminal operation program
Converts Rx RF signal to baseband signal
Converts baseband signal to Tx RF signal
Receive Frequency (MHz)
CELLULAR
869.82~893.19
1930~1990
Current
4.2V
600mA
4.2V
600mA
Function
PCS
GPS
1575.42
Power
0.20W
0.20W

Advertisement

Table of Contents
loading

Related Manuals for LG PX8700

Summary of Contents for LG PX8700

  • Page 1 Features of PX8700 1. Wave Type • CELLULAR : G7W • PCS : G7W 2. Frequency Scope Transmit Frequency (MHz) Receive Frequency (MHz) CELLULAR CELLULAR 824.82 ~ 848.19 1850~1910 869.82~893.19 1930~1990 1575.42 3. Rated Output Power : CELLULAR = 0.20W PCS = 0.20W...
  • Page 2 PX8700 CDMA Mobile Subscriber Unit PX8700 SERVICE MANUAL TRI BAND CDMA [PCS/Cellular/GPS] CDMA MOBILE PHONE - 2 - LG Electronics Inc.

  • Page 3: Table Of Contents

    1. NAM Program Method and Telephone Number Inputting Method ......... 16 CHAPTER 3. Circuit Description 1. RF Transmit/Receive Part......................26 2. Digital/Voice Processing Part.....................33 CHAPTER 4. Trouble Shooting……………………………………………….…………………….37 CHAPTER 5. Safety……………………………………………………………….……………..…..88 CHAPTER 6. Glossary………………………………………………………….………………..…..91 APPENDIX……………………………………………………………………………………….….103 - 3 - LG Electronics Inc.

  • Page 4: General Introduction

    Cellular uses 800MHz and PCS uses 1.9GHz. The PX8700 support GPS Mode, we usually call it tri-band phone. Also, PX8700 works on Advanced Mobile Phone Service (S-GPS). We call it dual-mode phone. If one of the Cellular, PCS base stations is located nearby, Call fail rate of triple-mode phone is less than dual-mode phone or single-mode phone.

  • Page 5: System Introduction

    At this time, the spectrums of other signals that have different codes are not recovered into its original state, and appears as the self-interference of the system. - 5 - LG Electronics Inc.

  • Page 6: Features And Advantages Of Cdma Mobile Phone

    1.25msec (800 times per second). By doing so, the gain tolerance and the different radio propagation loss on the forward/backward link are complemented. - 6 - LG Electronics Inc.
  • Page 7 That is, each mobile station signal - 7 - LG Electronics Inc.
  • Page 8 In addition, in the CDMA system, services and service charges are classified further into different classes so that more transmit power can be allocated to high class service users for easier call set-up; they can also be given higher priority of using hand-off function than the general users. - 8 - LG Electronics Inc.

  • Page 9: Specification

    3.1.10 Battery Type, Capacity and Operating Time. Unit = Hours : Minutes Standard (1,100mAh) CELLULAR About 380 Hours (SCI=2) Standby Time About 380 Hours (SCI=2) CELLULAR 230 Minutes (-92dBm input) Talk time 230 Minutes (-92dBm input) - 9 - LG Electronics Inc.
  • Page 10 2) PCS: 0.224W 3.3.3 Interference Rejection 1) Single Tone : -30dBm at 900 kHz (CELLULAR), -30dBm at 1.25MHz(PCS) 2) Two Tone : -43dBm at 900 kHz & 1700kHz(CELLULAR), -43dBm at 1.25 MHz & 2.05 MHz (PCS) - 10 - LG Electronics Inc.
  • Page 11 3.4.2 PCS mode Ch # Center Freq (MHz) Ch # Center Freq (MHz) Ch # Center Freq (MHz) 1851.25 1871.25 1891.25 1852.50 1872.50 1892.50 1853.75 1873.75 1893.75 1855.00 1875.00 1895.00 1856.25 1876.25 1896.25 1857.50 1877.50 1897.50 - 11 - LG Electronics Inc.
  • Page 12 Ch # Center Freq (MHz) Ch # Center Freq (MHz) 1931.25 1951.25 1971.25 1932.50 1952.50 1972.50 1933.75 1953.75 1973.75 1935.00 1955.00 1975.00 1936.25 1956.25 1976.25 1937.50 1957.50 1977.50 1938.75 1958.75 1978.75 1940.00 1960.00 1000 1980.00 - 12 - LG Electronics Inc.
  • Page 13 3.5.3 GPS mode : 1575.42 MHz 3.5.4 Bluetooth mode : 2400 MHz ~ 2483.5 MHz 3.6 AC Adaptor : See Appendix 3.7 Cigar Lighter Charger : See Appendix 3.7 Hands – Free Kit : See Appendix - 13 - LG Electronics Inc.

  • Page 14: Installation

    4.3.4. Microphone Installation Install the microphone either by cliiping I onto the sunvisor (driver’s side) or by attaching it to door post (driver’s side), using a velcno adhesive tape (not included). 4.3.5 Cable Connections - 14 - LG Electronics Inc.
  • Page 15 Connect the kit’s power cable connector to the interface box power receptacle. 4.3.5.2 Antenna Cable Connection Connect the antenna coupler cable connector from the cradle to the external antenna connector. ( Antenna is not included.) - 15 - LG Electronics Inc.

  • Page 16: Nam Program Method And Telephone Number Inputting Method

    1. NAM Program Method and Telephone Number Inputting Method 1. Press ‘menu’ + 0 + “000000” Press ‘1’ key for entering ‘Service Prg.’ ● Usually pressing ‘Soft Key 1’ will save the change. ● To exit Service Program, press ‘END’ key. - 16 - LG Electronics Inc.
  • Page 17 Press soft key 2 to edit previous NAM1 items. 2-3) NAM1 Phone Number (MIN) You can edit NAM1 Phone Number(MIN). Press soft key 1 to edit more NAM1 items. Press soft key 2 to edit previous NAM1 items. - 17 - LG Electronics Inc.
  • Page 18 Press ‘Soft Key 2’ to edit previous NAM1 items. 2-6) More NAM1 Programming You can decide to edit more NAM1 items. Press ‘Soft Key 1’ to exit Service Programming. Press ‘Soft Key 2’ to edit more advanced NAM1 items. - 18 - LG Electronics Inc.
  • Page 19 Press ‘Soft Key 2’ to edit previous NAM1 items. 2-9) NAM1 NMSID You can edit NAM1 NMSID. Press ‘Soft Key 1’ to edit more NAM1 items. Press ‘Soft Key 2’ to edit previous NAM1 items. - 19 - LG Electronics Inc.
  • Page 20 Press ‘Soft Key 2’ to edit previous NAM1 items. 2-12) NAM1 PRL Enabled You can see NAM1 PRL Enabled. Press ‘Soft Key 1’ to edit more NAM1 items. Press ‘Soft Key 2’ to edit previous NAM1 items. - 20 - LG Electronics Inc.
  • Page 21 Press ‘Soft Key 2’ to edit previous NAM1 items. 2-15) NAM1 CDMA Sec. CH A You can edit NAM1 CDMA Secondary Channel A. Press ‘Soft Key 1’ to edit more NAM1 items. Press ‘Soft Key 2’ to edit previous NAM1 items. - 21 - LG Electronics Inc.
  • Page 22 Press ‘Soft Key 2’ to edit previous NAM1 items. 2-18) Lockout SID/NID You can edit Lockout SID/NID Pairs. Press ‘Soft Key 1’ to edit more NAM1 items. Press ‘Soft Key 2’ to edit previous NAM1 items. - 22 - LG Electronics Inc.
  • Page 23 You can edit NAM1 Foreign NID Registration. Press ‘Soft Key 1’ to edit more NAM1 items. Press ‘Soft Key 2’ to edit previous NAM1 items. Press Left, Right, Up, Down key to toggle Yes/No. - 23 - LG Electronics Inc.
  • Page 24 Press ‘Soft Key 2’ to edit NAM2 related items. 2-24) Phone Model You can see the Phone Model number. Press ‘Soft Key 1’ to edit more items. Press ‘Soft Key 2’ to edit previous items. - 24 - LG Electronics Inc.
  • Page 25 PX8700 2-25) Slot Cycle Index You can edit Slot Cycle Index Press ‘Soft Key 1’ to save Slot Cycle Index. Press ‘Soft Key 2’ to edit previous items. 2-26) Powering Down Restart. - 25 - LG Electronics Inc.

  • Page 26: Chapter 3. Circuit Description

    After that, the RF signal is amplified by the Power Amp in order to have enough power for radiation. Finally, the RF signal is sent out to the cell site via the antenna after going through the duplexer. - 26 - LG Electronics Inc.
  • Page 27 PX8700 [Figure 1-1] Block Diagram of PX8700 U108 F104 U102 DUAL PAM PCS Tx RF BPF RFT6150 AWT6310R ACPF - 7002 Gain:27dB IL:3.5dB RFT6150 Attn.:35dB Gain Control Tri-band Ant. DP101 PCS Duplexer ACMD-7402 U103 Mobile S/W MS-156NB F105 SBI 1...
  • Page 28 DFM processor CDMA processor MCP MEMORY 1G NAND Flash gpsOne processor 512M SDRAM (TY9000A000AMGP) Memory Controller GPIO KEYPAD RFR6500 Rx ADCs QDPS4000 - VOCODER - MIDI(CMX) etc. EARPIECE CODEC Stereo SPK AUDIO AMP (LM4857) - 28 - LG Electronics Inc.
  • Page 29 The main function of Triplexer is to prohibit the other band signals from flowing into the one band circuit and vice versa. RF designer can use common tri-band antenna regardless of frequency band (800, 1575 and 1900 MHz). The specification of PX8700 Triplexer is described below:...
  • Page 30 The characteristics of Low Noise Amplifier (LNA) are low noise figure, high gain, high intercept point and high reverse isolation. The frequency selectivity characteristic of mobile phone is mostly determined by LNA. The specification of PX8700 GPS LNA is described below Parameter GPS Band...
  • Page 31 Third-order Intercept Point (IIP3) requirements of IS-98D and J-STD-018 specifications for Sensitivity, Two-Tone Inter-modulation, and Single-tone Desensitization. Operation modes and band selection are specially controlled from the Mobile Station Modem MSM6550. The specification of PX8700 Mixers is described below: Parameter Low gain High gain...
  • Page 32 TRK_LO_ADJ from MSM as 0.5 V~2.5 V DC via R and C filter in order to generate the reference frequency of 19.2 MHz and input it into the frequency synthesizer. Frequency stability depending on temperature is ±2.0 ppm. - 32 - LG Electronics Inc.

  • Page 33: Digital/Voice Processing Part

    The memory part is made up of a NAND Flash memory and a SDRAM for storing data. 2.2.5 Power Supply Part The power supply part is made up of circuits for generating various types of power, used for the digital/voice processing part. - 33 - LG Electronics Inc.
  • Page 34 When received, I and Q data are demodulated into symbols by the demodulator, and then de-interleaved in reverse to the case of transmission. Then, the errors of data received from viterbi decoder are detected and corrected. They are voice-decoded at the vocoder in order to output digital voice data. - 34 - LG Electronics Inc.
  • Page 35 The Rx part LDO(Out5) is operated by the control signal SLEEP/ from MSM6550 The Tx part LDO(Out7) is operated by the control signal IDLE/ from MSM6550. The TCXO part LDO(U403) is operated by the control signal TCXO_EN/ from MSM6550. - 35 - LG Electronics Inc.
  • Page 36 LCD module contains a controller which will display the information onto the LCD by 16-bit data from the MSM6550. It is also supplied stable +2.8V_LCD by Out3 in U402 for fine view angle and LCD reflects to improve the display efficiency. 4 LEDs is used to display LCD backlight. - 36 - LG Electronics Inc.

  • Page 37: Chapter 4. Trouble Shooting

    2004 - Sector Power: -30 dBm Spectrum Analyzer Setting Oscilloscope Setting 4. Check RF Signal path 1. Check DC Power supply circuit 5. Check 2. Check Rx I/Q data VCTCXO Circuit Redownload SW, CAL - 37 - LG Electronics Inc.
  • Page 38 Check L412 of U303 +2.9V_RX0 is OK? U302, U303 The Problem may be Logic part Refer to Logic troubleshoot DC Power supply Circuit is OK. See next Page to check VCTCXO circuit. Circuit Diagram - 38 - LG Electronics Inc.
  • Page 39 Logic part Refer to Logic troubleshoot Test Point Changing X101 X101 Check R125, R127 C1002 VCTCXO Circuit is OK. See next Page to check Similar? Control signal SW Download Replace Board Waveform Graph Graph - 39 - LG Electronics Inc.
  • Page 40 PX8700 Circuit Diagram - 40 - LG Electronics Inc.
  • Page 41 Pin 50(SBST0) Control Signal is Ok Pin 51(SBDT0) of U105 Similar? See next Page to Check Check if there is RF signal path Any Major Difference ◆ Refer to Graph 4.1 .1(c,d) Replace Board - 41 - LG Electronics Inc.
  • Page 42 PX8700 Waveform SBCK0 SBCK0 SBDT0 SBST0 Graph 4.1.1(c) Graph 4.1.1(d) Circuit Diagram - 42 - LG Electronics Inc.
  • Page 43 Detected Signal? Any Major Difference C1034, L111 ◆ Refer to Graph 4.1.1(g) C173 Check Detected Signal? C1034 & C173 L111 RF Signal Path is OK. See next Page to check RX I/Q data signal. - 43 - LG Electronics Inc.
  • Page 44 PX8700 Waveform U103 Graph 4.1.1(e) U104 Graph 4.1.1(f) DP101 Pin 3 Graph 4.1.1(g) - 44 - LG Electronics Inc.
  • Page 45 PX8700 Circuit - 45 - LG Electronics Inc.
  • Page 46 Pin9 (RX0_IM) Similar? Pin10 (RX0_IP) Replace Board Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(h,i) All DCN RX check is completed if the phone still does not work, change the board. - 46 - LG Electronics Inc.
  • Page 47 PX8700 Waveform RX0_QP RX0_IP RX0_QM RX0_IM Graph 4.1.1(i) Graph 4.1.1(h) Circuit - 47 - LG Electronics Inc.
  • Page 48 4119 - Sector Power: -30 dBm Spectrum Analyzer Setting Oscilloscope Setting 4. Check RF Signal path 1. Check DC Power supply circuit 5. Check 2. Check Rx I/Q data VCTCXO Circuit Re-download SW, CAL - 48 - LG Electronics Inc.
  • Page 49 Refer to Logic troubleshoot Check C318 +2.6V_MSMP2 is OK? of U302 The Problem may be Logic part Refer to Logic troubleshoot DC Power supply Circuit is OK. See next Page to check VCTCXO Circuit. Circuit Diagram - 49 - LG Electronics Inc.
  • Page 50 +2.9V OK? be Logic part Refer to Logic troubleshoot Changing X101 Check C1001, C1002, C1006, R125 VCTCXO Circuit is OK. See next Page to check Similar? Control signal. SW Download Replace Board Waveform Graph Graph - 50 - LG Electronics Inc.
  • Page 51 PX8700 Circuit Diagram - 51 - LG Electronics Inc.
  • Page 52 Check Pin 49(SBCK0), Pin 50(SBST0) Control Signal is Ok Pin 51(SBDT0) of U105 Similar? See next Page to Check Check if there is RF signal path Any Major Difference ◆ Refer to Graph 4.1.2(c,d) Replace Board - 52 - LG Electronics Inc.
  • Page 53 PX8700 Waveform SBCK0 SBCK0 SBDT0 SBST0 Graph 4.1.2(c) Graph 4.1.2(d) Circuit Diagram - 53 - LG Electronics Inc.
  • Page 54 Check if there is Changing DP101 Detected Signal? Any Major Difference ◆ Refer to Graph 4.1.2(g) Check C1055 & Detected Signal? C153 RF Signal Path is OK. See next Page to check RX I/Q data signal. - 54 - LG Electronics Inc.
  • Page 55 PX8700 Waveform U103 Graph 4.1.2(e) U104 Graph 4.1.2(f) DP101 Graph 4.1.2(g) - 55 - LG Electronics Inc.
  • Page 56 PX8700 Circuit - 56 - LG Electronics Inc.
  • Page 57 Pin9 (RX0_IM) Pin10 (RX0_IP) Similar? Replace Board Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(h,i) All PCS RX check is completed if the phone still does not work, change the board. - 57 - LG Electronics Inc.
  • Page 58 PX8700 Waveform RX0_QP RX0_IP RX0_QM RX0_IM Graph 4.1.2(i) Graph 4.1.2(h) Circuit - 58 - LG Electronics Inc.
  • Page 59 PX8700 4.2 TX Part Trouble 4.2.1 DCN TX Trouble Mobile duplexer Triplexer Dual RF TX RFT6150 < PX8700 DCN TX Part > - 59 - LG Electronics Inc.
  • Page 60 VCTCXO Circuit VCTCXO Circuit 3.Check RFT6150 3.Check RFT6150 7.Check Triplexer 7.Check Triplexer Circuit Circuit 4.Check RF SAW 4.Check RF SAW 8.Check Mobile switch 8.Check Mobile switch 5.Check Dual PAM 5.Check Dual PAM Re-download.cal Re-download.cal VCTCXO - 60 - LG Electronics Inc.
  • Page 61 PX8700 4.2.1.1. Check RFT Circuit TEST POINT R102:+2.9V_TX R109:+2.6V_MSMP <RFT6150:+2.9V_TX, +2.6V_MSMP2> C307:+2.9V_TX PMIC C318:+2.6V_MSMP2 < PMIC :+2.9V_TX, +2.6V_MSMP2 > - 61 - LG Electronics Inc.
  • Page 62 PX8700 Circuit Diagram <RFT6150 & PMIC +2.9V_TX, +2.6V_MSMP2 circuit> - 62 - LG Electronics Inc.
  • Page 63 PX8700 Checking Flow U102 START Check R102 Check PMIC Circuit +2.9V_TX ? C307: +2.9V_TX Check R109 Check PMIC Circuit +2.6V_MSMP2 ? C318: +2.6V_MSMP2 RFT Voltage is ok. See next page - 63 - LG Electronics Inc.
  • Page 64 See next page. See next page. VCTCXO VCTCXO Check X101 PIN4 Check X101 PIN4 X101 PIN3 X101 PIN3 +2.9V ? +2.9V ? Check U302 Check U302 Replace X101 Replace X101 Circuit Diagram TCXO Waveform - 64 - LG Electronics Inc.
  • Page 65 4.2.1.4. Check RFT Circuit TEST Point CELL_OUT PIN21 TCXO TX_QP PIN15 PIN 27 TX_QM PIN 28 U102 PIN 29 PIN 30 TX_IP TX_IM PIN 1, 2, 3, 4 TX_ON, SBCK0, SBDT0, SBST0 Circuit Diagram - 65 - LG Electronics Inc.
  • Page 66 Check U102 Pin2, 3,4 22,24,25,31 +2.9V_TX) SBCK0 SBDT0 SBST0 Refer to Graph4.2.1.4 (D) Check PMIC Circuit Check SBI Signal Similar? LINE&MSM Check U102 Pin1 (TX_ON Signal) Replace U102 Check TX_ON ≥2.5 Signal Line &MSM - 66 - LG Electronics Inc.
  • Page 67 PX8700 Waveform Graph 4.2.1.4(A) Graph 4.2.1.4(C) RX_I_P RX_Q_P RX_Q_N RX_I_N Graph 4.2.1.4(B) SBDT SBST SBCK SBCK Graph 4.2.1.4(D) - 67 - LG Electronics Inc.
  • Page 68 Refer to Graph 4.2.1.5 F105 F105 Similar ? Similar ? RF TX SAW is OK. RF TX SAW is OK. Relpace U103 Relpace U103 PIN1 RF IN PIN1 RF IN Circuit Diagram Waveform RF_OUT RF_IN RF_IN RF_OUT - 68 - LG Electronics Inc.
  • Page 69 PIN2 RF IN PIN2 RF IN Check U108 Pin3 Check U108 Pin3 PIN1 VREF CELL PIN1 VREF CELL Check PA_R1 Signal line Check PA_R1 Signal line ≤ 1.8V ? ≤ 1.8V ? Replace U108 Replace U108 - 69 - LG Electronics Inc.
  • Page 70 PX8700 Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.1.6 - 70 - LG Electronics Inc.
  • Page 71 ANT Port ANT Port Start Check DP104 Pin1,6 TX_PORT ANT_PORT DP104 DP104 Refer to Graph4.2.1.8 Duplexer is OK Similar? DP101 TX Port TX Port Replace DP104 Circuit Diagram Waveform TX_Port TX_Port ANT_Port ANT_Port Graph 4.2.1.8 - 71 - LG Electronics Inc.
  • Page 72 Refer to Graph 4.2.12 U104 U104 Triplexer Circuit OK. Triplexer Circuit OK. Similar ? Similar ? See next page. See next page. Relpace U104 Relpace U104 Cell port Cell port Circuit Diagram Waveform CELL_Port CELL_Port ANT_Port ANT_Port - 72 - LG Electronics Inc.
  • Page 73 Mobile Switch Circuit OK. Similar ? Similar ? See next page. See next page. RF IN RF IN Relpace U103 Relpace U103 Circuit Diagram Waveform RF OUT RF IN RF IN RF OUT Graph 4.2.1.9 - 73 - LG Electronics Inc.
  • Page 74 PX8700 4.2.2 PCS TX Trouble Test Point Mobile SW Triplexer PCS duplexer DUAL PAM RF SAW VCTCXO RFT 6150 RFT6150 - 74 - LG Electronics Inc.
  • Page 75 HDET 1. Check PMIC(LDO) Circuit 6. Check Duplexer 2. Check VCTCXO Circuit 7. Check Triplexer 3. Check RFT6150 Circuit 8. Check Mobile Switch 4. Check RF SAW Re-download SW, CAL 5 Check Dual PAM - 75 - LG Electronics Inc.
  • Page 76 PX8700 4.2.2.1. Check Regulator Circuit TEST POINT +2.9V_TCXO +VPWR ++VPW OUTPUT +2.9V_TCXO U302 TCXO_EN TX_LDO_EN <+2.9V_TCXO> Circuit Diagram - 76 - LG Electronics Inc.
  • Page 77 PX8700 Checking Flow U302 Check U302 PinC1 Replace U302 +2.9V PMIC Circuit is OK See Next Page - 77 - LG Electronics Inc.
  • Page 78 Checking Flow Start Check X101 Pin3 Refer to Graph 4.2.2.2 +2.9V_TCXO Pin 4 X101 VCTCXO Circuit OK TCXO_OUT Similar? Pin 3 Check X101 Pin4 Check U302 +2.9V? Circuit Diagram Replace X101 Waveform Graph 4.2.2.2 - 78 - LG Electronics Inc.
  • Page 79 4.2.2.3. Check RFT6150 Circuit Test Point PCS_OUT PIN21 PIN15 TCXO TX_QM PIN 27 U102 PIN 28 TX_QP PIN 29 TX_IP PIN 30 TX_IM PIN 1, 2, 3, 4 TX_ON, SBCK0, SBDT0, SBST0 Circuit Diagram - 79 - LG Electronics Inc.
  • Page 80 PIN : 6,9,13,14,17,19,20,22,24,25,31 +2.9V_TX Check U102 Pin2, 3,4 SBCK0 SBDT0 SBST0 Refer to Graph4.2.2.3 (D) Check Regulator Circuit Check SBI Signal Similar? Line&MSM Check U102 Pin1 (TX_ON Signal) Replace U102 Check TX_ON ≥2.5 Signal Line&MSM - 80 - LG Electronics Inc.
  • Page 81 PX8700 Waveform Graph 4.2.2.3(A) Graph 4.2.2.3(C) TX_I_P TX_Q_P TX_Q_N TX_I_N Graph 4.2.2.3(B) SBDT SBST SBCK SBCK Graph 4.2.2.3(D) - 81 - LG Electronics Inc.
  • Page 82 Test Point Checking Flow Start RF_OUT Check F104 Pin1, 3 RF_IN RF_OUT Refer to Graph4.2.2.4 RF TX SAW is OK F 104 Similar? Replace F104 RF_IN Circuit Diagram Waveform RF_OUT RF_IN RF_IN RF_OUT Graph4.2.2.4 - 82 - LG Electronics Inc.
  • Page 83 Similar? PAM Circuit is OK Check U108 Pin 9 PA_R1 RF_IN VREF_PCS ≥3.8V Check VCC Line Check U108 Pin6 Check +2.9V_TX Line ≥2.70V And PA_ON1 Check U108 Pin4 Check PA_R1 Signal ≤1.8V Replace U108 - 83 - LG Electronics Inc.
  • Page 84 PX8700 Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.2.5 - 84 - LG Electronics Inc.
  • Page 85 Test Point Checking Flow ANT_PORT Start Check DP101 Pin1,3 TX_PORT ANT_PORT Refer to Graph4.2.2.6 DP101 Duplexer is OK Similar? TX_PORT RX_PORT Replace DP101 Circuit Diagram Waveform TX_ PORT ANT_PORT RX_PORT TX_PORT ANT_ PORT Graph4.2.2.6 - 85 - LG Electronics Inc.
  • Page 86 Test Point Checking Flow Start Check U104 Pin7,2 PCS_PORT ANT_PORT Refer to Graph4.2.2.7 ANT PORT Triplexer Circuit is Similar? OK See next page U104 Replace U104 Circuit Diagram Waveform RF_IN RF_IN RF_OUT RF_OUT Graph4.2.2.7 - 86 - LG Electronics Inc.
  • Page 87 Test Point Checking Flow Start RF_OUT Check U103 Pin1, 2 RF_IN RF_OUT Refer to Graph4.2.2.8 U103 Mobile Switch is OK Similar? RF_IN Replace U103 Circuit Diagram Waveform RF_OUT RF IN RF_IN RF OUT Graph 4.2.2.8 - 87 - LG Electronics Inc.
  • Page 88 4.3 Logic Part Trouble 4.3.1 Power 4.3.1.1 Power-On Trouble Circuit Diagram Test Point +2.8V_LCD +2.6V_MSMP2 +2.85V_SD +2.9V_TX +3.2V_MOTOR +2.8V_BT +1.5V_CAMD +2.9V_TCXO +2.6V_MSMA...
  • Page 89 Checking Flow START Check Battery Voltage Charge of Change Battery and try again > 3.3V ? Push power-on key and check Check the contact of power-key the level change of or dome switch U302 PWR_ON Check the voltage Level of the following port at 302 +1.4V_MSMC +2.6V_MSMP2 Replace the U302...
  • Page 90 4.3.1.2 Charging Trouble Circuit Diagram Test Points Pin1 CON401 V_BATT U402...
  • Page 91 Checking Flow SETTING : Connect the battery and the charging adaptor (TA) to the phone START The charging adaptor (TA) is out of order. Voltage at +V_CHAR Change the charging adaptor. of D402 = 4.8V? Voltage at C309 = 4.8V? Replace U402, D403 Voltage at +VPWR Replace PMIC [ U302 ]...
  • Page 92 4.3.2 LCD 4.3.2.1 LCD Trouble • LCD Control signals Circuit Diagram From MSM : D2[0:15], LCD_RESET/, SLCD_RESET/, MLCD_IF_MODE, LCD_RS, M_VSYNC, MLCD_CS/, SLCD_CS/, OE2/, WE2, LCD_BL_EN, LCD_BL_FC/ • Check point - The assembly status of the LCD Module - The status of Connector connection - The Soldering of connector Test Points F407 F408...
  • Page 93 Checking Flow START Voltage at +2.8V_LCD Replace U302 of U302 = 2.8V? Check the Control signal ; Check F401, F403, F407, F408, F409, F410 D2[0:15], RESET/, LCD_CS/, WE2/,RS Check CON404 soldering Re-solder CON404 Change the LCD Module...
  • Page 94 4.3.3 Camera 4.3.3.1 Camera Trouble Circuit Diagram Camera 1.5V Digital • Camera Control signals From MSM : CAM_RESET/,CAM_MCLK, CAM_SCL, CAM_SDA, To MSM : CAM_PCLK, CAM_DATA[0:7], CAM_VSYNC, CAM_HSYNC...
  • Page 95 Test Points • Check point - The assembly status of the Camera Module - The Soldering of connector C330 : +1.5VCAMD F410 CON404 F405 U302 F404 X101 F402 F406 F409 U101 U105...
  • Page 96 4.3.4 Audio 4.3.4.1 Speaker Trouble Circuit Diagram Test Points U106 C110 R144 C113 C112 U103 L103...
  • Page 97 Checking Flow SETTING : “Melody on” at sounds of test menu. START Check the Soldering of Voltage at L103 Replace U106 Is about 3.4~4.2V R144 Re-solder R144 Check the audio signal at Check the Soldering of Replace MSM C112, C113 C112, C113 Re-solder C112, C113 Check the audio signal at...
  • Page 98 4.3.4.2 Receiver Trouble Circuit Diagram Test Points R314 R315 U305 C338...
  • Page 99 Checking Flow START Voltage at C338 Check PMIC Is 2.6V Check the audio signal at Check the Soldering of Replace MSM R314, R315 U305 Re-solder U305 Check the audio signal at Check the Soldering of Replace U305 R314, R315 R314, R315 Re-solder R314, R315 Check the state Replace Receiver...
  • Page 100 4.3.4.4 Headset Trouble Circuit Diagram Test Points CON402 R415 R416 C116 C115 R405...
  • Page 101 Checking Flow START Insert the headset to the handset. Headset detect problem Does the audio Profile of the phone change to the headset mode? Set the audio part of the test equipment to echo mode Set the audio part of the test equipment to Headset receiving continuous wave mode...
  • Page 102 Headset detect problem Headset detect problem Level of pin8 of CON402 Check soldering R405 Is 1.65~2.10V? Re-solder R405 Check soldering Re-solder U302 U302 Level of EAR_JACK_SENSE/ Download SW Is low? Headset sending path problem Headset sending path problem Level of pin2 of CON402 Re-solder Is 1.65~2.10V? R415, R416...
  • Page 103 4.3.4.3 Mic Trouble Circuit Diagram Test Points R126 M101...
  • Page 104 Checking Flow SETTING : After initialize 5515C, Test Cellular START Check the voltage level Check the soldering Re-solder R126 at R126 is 1.0~2.0V Of R126 Replace MSM Check the signal level Replace the microphone at each side of MIC. Check the soldering Re-soldering at C209 C209...
  • Page 105 Checking Flow START Check the Camera M_Clock at X101 Replace X101 (24.5454MHz) Check the clock from Camera Replace the Camera module at F405 : CAM_PCLK Check the voltage of the following LDOs : Replace Sub B’d U101, +2.8V_CAMA U105, Main b’d U302 +2.6V_CAMIO +1.5V_CAMD Check the...
  • Page 106 4.3.6 Vibrator, Micro SD Detect, and USB Interface 4.3.6.1 Vibrator Circuit Diagram Test Points LCD Module U302 Motor+ C313 M200...
  • Page 107 Checking Flow SETTING : “Vibrator on” at Sounds of test menu START Change the main board Is the voltage of C313 2.6V ? Check connection Reconnect CON404 Of CON404 Check LCD Module Reconnect FPCB Connector Motor+ Change the LCD Module Check the Level of Motor+ Replace Vibrator The vibrator will...
  • Page 108 4.3.6.2 Micro SD Detect Circuit Diagram < PMIC > Test Points CON105 C141 C140 C138 C139 C142 C137 C313 U302 C136...
  • Page 109 Checking Flow SETTING : Insert the mini SD card into the phone START Level of SD_DETECT at C136 Check the soldering of CON105 of CON105 is ‘Low’ ? Level of +2.85V_SD at C313 Replace U302 is 2.85V ? Levels of SD_CMD(C141) and SD_DATA[0]~DATA[3](C137,138,139,142) Replace the MSM are ‘High’...
  • Page 110 4.3.6.3 USB Interface Circuit Diagram U201 MSM6550 L302 X202 Test Points C314 U302 R307 R306...
  • Page 111 Checking Flow START Level of VBUS at L302 Check the connecting of the data cable is 5.0V ? Re-soldering Check the soldering X202 The Frequency at X202 is 48 MHz? X202 Replace X202 Re-soldering Check the voltage level at C314 Check the soldering U302 U302 Is it almost 3.3V?

  • Page 112: Chapter 5. Safety

    If so, use only a manufacture approves antenna. Otherwise, take your phone to a qualifies service center for repair. Use only the supplied or approved antenna. Non-approved antennas, modifications, or attachments, could impair call quality, damage the phone, and violate FCC egulations. ▣ Driving - 88 - LG Electronics Inc.
  • Page 113 Do not transport or store flammable gas, liquid, or explosives in the compartment of your vehicle which contains your phone or accessories. - 89 - LG Electronics Inc.
  • Page 114 One Battery march Park, Quincy, MA 02269, Attn: Publication Sales Division. Rule of Thumb: Using common sense at all times when handling, installing or using the phone. Any questions should be directed to you nearest Service Center or authorized service technician or electrician. - 90 - LG Electronics Inc.

  • Page 115: Chapter 6. Glossary

    A-key. A secret, 64-bit pattern stored in the mobile station. It is used to generate update the mobile station’s Shared Secret Data. The A-key is used in the mobile station authentication process. Analog Access Channel. An analog control channel used by a mobile station to access a system to obtain - 91 - LG Electronics Inc.
  • Page 116 Neighbor Set, and Remaining Set. . See Code Division Multiple Access CDMA Channel. The set of channels transmitted between the base station within a given CDMA frequency assignment. See also Forward CDMA Channel and Reverse CDMA Channel. - 92 - LG Electronics Inc.
  • Page 117 Dim-and-Burst. A frame in which primary traffic is multiplexed with either secondary traffic or signaling traffic. Discontinuous Transmission (DTX). A mode of operation in which a mobile station transmitter - 93 - LG Electronics Inc.
  • Page 118 Channels, and Traffic Channels. The Forward CDMA Channel always carries a Pilot Channel and may carry up to one Sync Channel, up to seven Paging Channels, and up to 63 Traffic Channels, as long as the total number of channels, including the Pilot Channel, is no greater than 64. - 94 - LG Electronics Inc.
  • Page 119 Interleaving. The process of permuting a sequence of symbols. kHz. Kilohertz (10 Hertz). ksps. Kilo-symbols per second (10 symbols per second). Layer 1. See Physical Layer. Layer 2. Layer 2 provides for the correct transmission and reception of signaling messages, including partial - 95 - LG Electronics Inc.
  • Page 120 Mobile station include portable units (e.g., handheld personal units) and units installed in vehicles. Mobile Station Class. Mobile station classes define mobile station characteristics such as slotted operation and - 96 - LG Electronics Inc.
  • Page 121 Traffic Channel data is sent when no service option is active and no signaling message is being sent. Null Traffic Channel data serves to maintain the connectivity between the mobile station and the base station. Number Assignment Module (NAM). A set of MIN-related parameters stored in the mobile station. - 97 - LG Electronics Inc.
  • Page 122 Channel, provides a phase reference for coherent demodulation, and provides a means for signal strength comparisons between base station for determining when to handoff. Pilot PN Sequence. A pair of modified maximal length PN sequences with period 2 used to spread the - 98 - LG Electronics Inc.
  • Page 123 Release. A process that the mobile station and base station use to inform each other of call disconnect. The set of all allowable pilot offsets as determined by PILOT_INC, excluding the pilot offsets of the pilots in - 99 - LG Electronics Inc.
  • Page 124 Slot Cycle. A periodic interval at which a mobile station operating in the slotted monitors the Paging Channel. Slotted Mode. An operation mode of the mobile station in which the mobile station monitors only selected slots - 100 - LG Electronics Inc.
  • Page 125 See also Universal coordinated Time. Timer-Based Registration. A registration method in which the mobile station registers whenever a counter reaches a predetermined value. The counter is incremented an average of once per 80 ms period. - 101 - LG Electronics Inc.
  • Page 126 ‘0’ to 1 and ‘1’ to –1). Zone-Based Registration. An autonomous registration method in which the mobile station registers whenever it enters a zone that is not in the mobile station’s zone list. ㎲. Microsecond - 102 - LG Electronics Inc.

  • Page 127: Appendix

    3. Component List 3.1 Accessories 3.2 Board 3.3 Mechanical Part 3.4 The Top of the Main_PCB 3.5 The Bottom of the Main_PCB 3.6 The Top of the SUB_PCB 3.7 The Bottom of the SUB_PCB - 103 - LG Electronics Inc.
  • Page 132 C130 C101 U105 CON101 R101 C146 C147 C104 Q103 R129 C122 R112 R128 Q102 C128 R115 C120 R110 R146 C127 R114 C119 R109 R147 C126 R113 C118 R108 C125 R117 C117 R107 C144 C121 R111 C124 R118 R116 C152 X101 M101 C134 C114...
  • Page 139 DCN Tx DCN Rx PCS Tx PCS Rx...
  • Page 147 D-1. Accessories...
  • Page 148 D-2. PCB Description LG Part No Q'ty Remarks SPFY0137301 PCB(MAIN:RF,PMIC,MSM) SPJY0034604 PCB(SUB PCB) SPKY0041501 FLEXIBLE PCB(SIDE) SPKY0041401 FLEXIBLE PCB(SIDE) SPCY0091803 FLEXIBLE PCB(LCD)
  • Page 149 D-3. Mechanical Parts Design No LG Part No Description Remarks MTAB0158201 TAPE, PROTECTION (UPPER) MWAF0034401 WINDOW, LCD(SUB) MWAE0021001 WINDOW,CAMERA MDAD0026101 DECO,CAMERA MTAA0125501 TAPE,DECO(CAMERA) MTAZ0153401 TAPE,WINDOW(CAMERA) MCJJ0045501 COVER,FOLDER(UPPER) MPBT0036501 PAD, CAMERA MPBJ0037101 PAD,MOTOR(UPPER) MPBZ0173301 PAD,CAMERA CONNECTOR MSAZ0045901 SHEET (BTM) MSAZ0047601 SHEET (UP)
  • Page 150 MLAB0000601 LABEL. A/S MCJA0036701 COVER,BATTERY MIDZ0129101 INSULATOR (B) MIDZ0129001 INSULATOR (A) MFEA0013301 FRAME, SHIELD MTAC0045101 TAPE, FRAME SHIELD MFCA0008201 FINGER, GROUND(4PIN)
  • Page 151 D-4. MAIN PCB BOT Ref No LG Part No Value Description C201 ECCH0000161 33 nF,16V,K,X7R,HD,1005,R/TP CAP,CERAMIC,CHIP C203 ECCH0002001 100000 pF,6.3V ,K ,B ,HD ,1005 ,R/TP CAP,CERAMIC,CHIP C204 ECZH0000830 33 pF,50V ,J ,NP0 ,TC ,1005 ,R/TP CAP,CHIP,MAKER C205 ECZH0000826 27 pF,50V ,J ,NP0 ,TC ,1005 ,R/TP...
  • Page 152 CON401 ENZY0018201 4 PIN,3.0 mm,ETC , ,Hard Pack Vertical CONNECTOR,ETC CON402 ENRY0006001 18 PIN,0.4 mm,ETC , ,H=2.5 CONNECTOR,I/O CON403 ENBY0040901 50 PIN, mm,ETC , , ,; , ,0.40MM ,STRAIGHT ,FEMALE ,SMD ,R/TP ,3.5 , CONNECTOR,BOARD T 1 CON404 ENBY0020402 60 PIN,0.4 mm,STRAIGHT ,AU ,STACKING HEIGHT 0.9 / SOCKET FOR KEYPAD TOCONNECTOR,BOARD T 1 D402 EDSY0010701 3.6*1.6*1.1 ,30 V,12 A,R/TP ,Schottky Barrier Diode...
  • Page 153 D-5. MAIN PCB TOP Ref No LG Part No Value Description ANT301 SNMF0014501 2.5 ,-1.5 dB,B/T Chip_6x2 ANTENNA,MOBILE,FIXED C1001 ECCH0000155 10 nF,16V,K,X7R,HD,1005,R/TP CAP,CERAMIC,CHIP C1002 ECCH0000155 10 nF,16V,K,X7R,HD,1005,R/TP CAP,CERAMIC,CHIP C1003 ECCH0000155 10 nF,16V,K,X7R,HD,1005,R/TP CAP,CERAMIC,CHIP C1004 ECCH0002002 47000 pF,10V ,K ,B ,HD ,1005 ,R/TP...
  • Page 154 C170 ECCH0002001 100000 pF,6.3V ,K ,B ,HD ,1005 ,R/TP CAP,CERAMIC,CHIP C171 ECCH0002001 100000 pF,6.3V ,K ,B ,HD ,1005 ,R/TP CAP,CERAMIC,CHIP C172 ECZH0000813 100 pF,50V ,J ,NP0 ,TC ,1005 ,R/TP CAP,CHIP,MAKER C173 ECZH0000813 100 pF,50V ,J ,NP0 ,TC ,1005 ,R/TP CAP,CHIP,MAKER C174 ECCH0002001 100000 pF,6.3V ,K ,B ,HD ,1005 ,R/TP CAP,CERAMIC,CHIP...
  • Page 155 L111 ELCH0004718 5.6 nH,S ,1005 ,R/TP , INDUCTOR,CHIP L113 ELCH0004729 56 nH,J ,1005 ,R/TP , INDUCTOR,CHIP L114 ELCH0004706 10 nH,J ,1005 ,R/TP , INDUCTOR,CHIP L115 ELCH0004705 8.2 nH,J ,1005 ,R/TP , INDUCTOR,CHIP L116 ELCH0004713 6.8 nH,J ,1005 ,R/TP , INDUCTOR,CHIP L118 ELCH0004729 56 nH,J ,1005 ,R/TP , INDUCTOR,CHIP...
  • Page 156 R310 ERHZ0000443 2200 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP,MAKER R314 ERHZ0000410 12 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP,MAKER R315 ERHZ0000410 12 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP,MAKER R319 ERHZ0000401 0 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP,MAKER R320 ERHZ0000406 100 Kohm,1/16W ,J ,1005 ,R/TP RES,CHIP,MAKER R401 ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP...
  • Page 157 D-6. KEY PCB TOP Ref No LG Part No Value Description LED103 EDLH0013403 WHITE ,ETC ,R/TP ,3.8*1.2*0.6T ,; DIODE,LED,CHIP LED104 EDLH0013403 WHITE ,ETC ,R/TP ,3.8*1.2*0.6T ,; DIODE,LED,CHIP...
  • Page 158 D-7. KEY PCB BOT Ref No LG Part No Value Description C101 ECCH0000198 2.2 uF,6.3V ,M ,X5R ,TC ,1005 ,R/TP CAP,CERAMIC,CHIP C102 ECCH0000155 10 nF,16V,K,X7R,HD,1005,R/TP CAP,CERAMIC,CHIP C103 ECCH0002001 100000 pF,6.3V ,K ,B ,HD ,1005 ,R/TP CAP,CERAMIC,CHIP C104 ECZH0000813 100 pF,50V ,J ,NP0 ,TC ,1005 ,R/TP...
  • Page 159 R105 ERHZ0000405 10 Kohm,1/16W ,J ,1005 ,R/TP RES,CHIP,MAKER R107 ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP R108 ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP R109 ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP R110 ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP RES,CHIP R111 ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP...

Table of Contents