Acer AT1945 Service Manual
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Acer AT1945 Service Manual

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Acer AT1945 & AT1946
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Summary of Contents for Acer AT1945

  • Page 1 Acer AT1945 & AT1946 Service Guide...
  • Page 2 Service Guide Version and Revision Version Date Revision History TPV Model Name Apr.-01-08 Initial release E198M2NBWAZEN...
  • Page 3 Any Acer Incorporated software described in this manual is sold or licensed "as is". Should the programs prove defective following their purchase, the buyer (and not Acer Incorporated, its distributor, or its dealer) assumes the entire cost of all necessary servicing, repair, and any incidental or consequential damages resulting from any defect in the software.
  • Page 4 DIFFERENT part number code to those given in the FRU list of this printed Service Guide. You MUST use the list provided by your regional Acer office to order FRU parts for repair and service of customer machines. Warning: (For FCC Certified Models) Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
  • Page 5 Precautions Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool or in a wet basement. Do not place the monitor on an unstable trolley, stand, or table. If the monitor falls, it can injure a person and cause serious damage to the appliance.

  • Page 6: Table Of Contents

    Table Of Contents Monitor Features ……………………………………… General Specifications ……………………………………… LCD TV Description ……………………………………… Precautions And Notices ……………………………………… D-SUB PIN Distribution ……………………………………… Chapter 1 Factory Preset Display Modes ……………………………………… LCD TV Panel Specification ……………………………………… Panel Features ……………………………………… General Specifications ……………………………………… Mechanical Specifications ………………………………………...

  • Page 7: Monitor Features

    Chapter 1 Monitor Features General Specifications...

  • Page 9: Lcd Tv Description

    LCD TV Description The LCD TV will contain a main board (include audio), an I/O board, a switching power board, a function keyboard (include an IR Board) and an Ear phone board. The main board and power board will house the flat panel to control logic I2C bus, DDC, brightness control logic for LCD panel, DC-DC conversion to supply the appropriate power to the whole board and transmitting TTL level signals into LCD Module to drive the LCD display circuit.

  • Page 10: D-Sub Pin Distribution

    D-SUB PIN Distribution This procedure gives you instructions for installing and using the LCD TV display. (1) Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduct ground.

  • Page 11: Factory Preset Display Modes

    Factory Preset Display Modes: Analog RGB Signal Timing Preset Mode Item H.Freq. Mode Resolution V.Freq. (Hz) BW(MHz) (KHz) 31.469 IBM VGA 3H 720x400 70.087 31.469 IBM VGA 12H 640x480 59.94 MACINTOSH 640x480 37.861 VESA 640x480 72.809 37.5 VESA 640x480 35.156 VESA 800x600 56.25...

  • Page 12: Lcd Tv Panel Specification

    LCD TV Panel Specification M190A1-L0A is a 19” wide TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins 2ch-LVDS interface. This module supports 1440 x 900 WXGA+ mode and can display 16.7M colors. The inverter module for Backlight is not built in. Panel Features -Super wide viewing angle - High contrast ratio...

  • Page 13: Optical Specifications

    Optical Specifications Test Conditions Optical Specifications...

  • Page 14: Connecting Peripherals

    Chapter 2 Connecting Peripherals Front panel controls...

  • Page 15: Remote Control & Osd Operating Instructions

    Chapter 3 Remote Control & OSD Operating instructions Using the Remote Control 5 e (Empowering Technology) Press to activate Acer Empowering Technology. See page 25. 6 MENU Press to open or close the Menu. 7 Back Press to back to previous Menu.
  • Page 16 Teletext 1 Color buttons (R/G/Y/B) Operates corresponding button on the teletext page. 2 INDEX Press to go to the index page. 3 SUBTITLE Press to view subtitles on the screen. 4 REVEAL Press to reveal hidden telext information. 5 SUBPAGE Press to access the teletext’s subpages directly.

  • Page 17: Using The Osd Menus

    Using the OSD Menus...

  • Page 25: Logo

    Logo When the monitor is power on, the LOGO will be showed in the center, and disappear slowly. How To Optimize The DOS-Mode Plug And Play Plug & Play DDC2B Feature This monitor is equipped with VESA DDC2B capabilities according to the VESA DDC STANDARD. It allows the monitor to inform the host system of its identity and, depending on the level of DDC used, communicate additional information about its display capabilities.

  • Page 26: Chapter 4 Machine Disassembly

    Chapter 4 Machine Disassembly This chapter contains step-by-step procedures on how to disassemble the monitor for maintenance. Disassembly Procedure Disassemble The Base 1. Put the monitor on a clean soft cloth with panel facing to the table. (Fig 1) (Fig 1) 2.
  • Page 27 (Fig 3 ) Disassemble the back cover 1. Remove four screws to remove back cover. (Fig 4) ( Fig 4) Remove the main board, power Board, IR board and key board. 1. Remove the rear cover, then the main board ,power board, ir board and key board show as below. (Fig 5-6) 2.
  • Page 28 Key board (Fig 6) Disassemble the speaker. Remove the four screws marked in red to remove the speakers. (Fig 7) ( Fig 8 ) Remove the main frame Remove the four screws marked in red to remove the main frame.
  • Page 29 ( Fig 9 ) (Fig 10) Disassemble the IR board (Fig 11) Disassemble the front panel...
  • Page 30 (Fig 12)

  • Page 31: Chapter 5 Trouble Shooting

    Chapter 5 Trouble Shooting No picture (LED orange) No picture Check key board/IR board Change key board/IR board Check 24V power supply Check IC971 power supply circuit Check main board Standby power supply Change U902 Check U401 Change U401 Check I C communication Check I C bus...

  • Page 32: Abnormal Display

    Abnormal display Reset source Check the source Check signal filter circuit Replace the filter or resistance RF signal Check TV system setup Check input Check LVDS cable Check Tuner Replace LVDS cable Check panel Replace panel Replace Tuner...
  • Page 33 No sound Reset source Check the source Check if mute Check TV Reset TV system Check input signal TV SIF system Check U401 Check TU1 Change TU1 Change U401 Check U601 Change U601 Check speaker Change speaker...
  • Page 34 No Power (No LED indicator) Check CN902 pin10,11 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C905 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901 Check R904, R905 and Change IC901 Check the auxiliary voltage is bigger than 10V and smaller than 20V...
  • Page 35 W / LED, No Backlight Check R803=12V Check adapter or MB Check ON/OFF Check Interface board Check IC801 Change Check IC801 PIN 15 have the output of square wave at short time Change IC801 Check the input of Q80 5, Q806 Change Q805, Q806,D801,D802,D803,Q804 Check the output of PT801, PT802 Change PT801, PT802...
  • Page 36 Key Board OSD is unstable or not working Is Key Pad Board connecting normally? Connect Key Pad Board Replace Button Switch Is Button Switch normally? Is Key Pad Board Normally? Replace Key Pad Board Check Main Board...

  • Page 37: Chapter 6 White-Balance, Luminance Adjustment

    Chapter 6 White-Balance, Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment. First adjust PC mode and then adjust AV mode, before started adjust white balance, please setting the Chroma-7120 MEM. Channel 1 to Cold color, MEM. MEM. channel 3 to standard color, MEM. and MEM. channel 5 to warm color, ( our cold parameter is x = 300 ±...
  • Page 38 1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>350 cd/m2 2. Switch the chroma-7120 to RGB-mode (with press “MODE” button) 3. Switch the MEM. channel to Channel 03 (with up or down arrow on chroma-7120) 4.

  • Page 39: Fru (Field Replaceable Unit) List

    Service Guide. For ACER AUTHORIZED SERVICE PROVIDERS, your Acer office may have a DIFFERENT part number code from those given in the FRU list of this printed Service Guide. You MUST use the local FRU list provided by your regional Acer office to order FRU parts for repair and service of customer machines.

  • Page 40: Exploded Diagram

    Exploded Diagram (Model: AT1945 & AT1946) item DESCRIPTION item DESCRIPTION BEZEL MAIN BOARD PCB DECO-ACER SCREW COVER_FUNC-ACER19 SCREW BUTTON_FUNC SCREW LED_LENS-ACER SCREW STAND SCREW BASE_S1 SCREW REAR COVER 19 SCREW Q36T 806 1 SCREW MAIN FRAME SCREW BKT SIDE EU...

  • Page 41: Edid Data

    EDID Data DDC DATA for VGA Input 00 : 20 : 50 : 60 :...

  • Page 42: Chapter 8 Pcb Layout

    Chapter 8 PCB Layout Main Board Layout...
  • Page 44 Power Board...
  • Page 45 Key Board IR board...

  • Page 46: Chapter 9 Schematic Diagram

    Chapter 9 Schematic Diagram Main Board Inverter Audio AMP 3W X 2 PANEL POWER TDA8932BTW POWER 3.3V,2.5V,1.8V,1.2V,1.1V BOARD LVDS PCMCIA ZENTEL Common Interface Controller SCALER MT5335AKU 5V,3.3V A3S56D40ETP DDR MT8295 3.3V,2.5V,1.2V,1.1V 3.3V,1.8V 2.5V MPEG-1 layer I/II decoding,Audio ADC,Audio DAC 3D surround processing with virtual surround Automatic volume control,Audio I/F,USB2.0 2-D Graphic,De-interlace,VADCx4,HDMI In I/F Digital TV Demodulator,Analog TV IF Demodulator...
  • Page 47 CN108 VGA_PLUGPWR NEARLY VGA CON. NEARLY IC R244 U0RX R245 U0TX VGASDA_IN R188 C101 4700pF VGASDA_IN L111 0 OHM 1/10W HSY NC# RED_GND R189 C186 0.01uF/25V VSY NC# 39 OHM +-1% 1/10W GRN_GND 80 OHM VGASCL_IN VGASCL_IN BLU_GND ZD121 C187 DB15 UDZSNP5.6B GRN_GND...
  • Page 48 U401E NEARLY YPBPR CONNECTOR SOY 0 DVDD12_VGA R105 C104 4700pF SOY 0 SOY 0 DVDD12_VGA SOY 1 Y 0P AVSS12_RGBADC L108 0 OHM 1/10W Y 0P Y 0P AVSS12_RGBADC Y 0N AVDD12_RGBADC Y 0N Y 0N AVDD12_RGBADC PB0P AVSS12_RGBFE Y 0_IN Y 0_IN_OUT R106 C105 0.01uF/25V...
  • Page 49 GND_TUNER U401F Close to MT5382p CN103 R179 C117 DVDD25_VADC CVBS0 CVBS0 DVDD25_VADC SC1_IN SY 1_IN 100 OHM 1/10W 0.047uF CVBS1 DVSS25_VADC C118 CVBS1 DVSS25_VADC R182 1uF/16V CVBS2 GND_TUNER GND_CVBS SY 0 SY 0 GD_CVBS GND_SV GND_SV GND_SV SY 1 SY 1 AVDD25_VADC AVDD25_VADC DIN JACK...
  • Page 50 C113 C115 C112 C110 CN102 560pF 560pF 1000pF/25V 1000pF/25V NEARLY CONNECTOR NEARLY IC SCT1_AUR_OUT SCT1_AUR_OUT 17 SCT1_AUR_IN SCT1_AV_IN R142 27 OHM 1/10W R143 C138 0.047uF SY 0 SCT1_AUL_OUT 100 OHM 1/10W SCT1_AUL_OUT 17 ZD105 SCT1_AUL_IN C139 SCT1_B_IN 47pF SCT1_FS_IN R145 C140 1uF/16V GND_SV SCT1_G_IN...
  • Page 51 U401C AV33 FB301 AVDD33_LVDS AVDD33_LVDS AVDD33_LVDSA AVDD33_LVDS BEAD AVDD33_LVDSB AVDD33_LVDS AVDD33_LVDSC AVDD33_VPLL C303 C302 C304 CK1N AVDD33_VPLL 0.1UF16V 1uF/16V 10uF/10V CK1P CK1N CI_POCE1# 20 CK1P AV33 FB302 AVDD33_VPLL BEAD C305 100uF/16V C306 C307 CK2N 1uF/16V 0.1UF16V CK2P CK2N CK2P MT5335PGU LVDS OUT U301 LVDSVDD...
  • Page 52 AV12 FB411 AVDD12_PLL U401D BEAD USB_VRT AVDD12_PLL USB_VRT AVDD12_ADCPLL USB_D- AVDD12_PLL USB_D- USB_DM AVDD12_TVDPLL USB_D+ AVDD12_PLL C502 C503 C504 C505 USB_D+ USB_DP AVDD12_HDMIPLL 1uF/16V 4.7uF/10V 0.1UF16V AVDD33_USB AVDD12_PLL 0.01uF/25V AVDD33_USB AVDD12_APLL AVDD12_USB AVDD12_PLL AVDD12_USB AVDD12_SY SPLL TP409 AVDD12_PLL AVDD12_DMPLL TP410 AVDD12_PLL AVDD12_DTDPLL MT5335PGU...
  • Page 53 +3V3SB DV33 R446 C488 R447 Y401 R448 1K OHM 1/10W ORESET# OXTALI OXTALO R449 U401B Q404 60MHz OSDA0 PWRDET 13,19 OSDA0 OSDA0 OSCL0 13,19 OSCL0 OSCL0 GPIO_3 CI_PDD3 20 C489 C490 L401 OSDA1 OSDA1 GPIO_4 CI_PDD4 20 D401 R450 10pF 10pF 0.82UH OSCL1...
  • Page 54 U401G AIN0_L ASPDIF AIN0_L ASPDIF AOMCLK TP402 AIN0_R AIN0_R AOMCLK AOLRCK AIN1_L AIN1_L AOLRCK AOLRCK AOBCK AIN1_R AOBCK AIN1_R AOBCK MT5133_RESET ADAC_VCM AIN2_L MT5133_RESET 19 AIN2_L AOSDATA0 AIN2_R AL1O AIN2_R AIN3_L AIN3_L AR1O C472 AIN3_R AL2O AIN3_R AVDD33_AADC 10uF/16V C473 AR2O AVDD33_AADC 0.1UF16V...
  • Page 55 U401A +1V3D U402A DDR SDRAM U402B RDQS0 RDQS0 RDQM0 MEM_WE# RN402 8P4R 75 OHM +-5% 1/16W MEM_ADDR12 RDQM0 DDR SDRAM RDQ0 RWE# RES(A12) MEM_CAS# MEM_ADDR11 MEM_DQ0 RDQ0 RWE_ RDQ1 RBA0 (PWR) MEM_RAS# MEM_ADDR10 MEM_DQ1 RDQ1 RBA0 DDRV_BEAD1 RDQ2 MEM_CS# MEM_ADDR9 MEM_DQ2 RDQ2 VDD1...
  • Page 56 U401J U404 POCE0# U0RX SPI FLASH U0RX POCE0_ U0RX POOE# U0TX U0TX POOE_ U0TX 32M bit PDD0 PDD0 PDD1 PDD1 OIRI_MT5335 PDD1 OIRI PDD0 R411 POOE# 0 OHM 1/10W POCE0# JTMS CI_RB PARB_ JTMS FRESET# JTRST# CI_PDD2 PDD2 JTRST_ JTCK HOLD JTCK JTDO...
  • Page 57 +3V3SB_uP D402 NC/RB520S-30 R472 DV33 NC/27K OHM 1/10W Q401 R409 CEC_IRQ 9,14 OSCL0 9,19 NC/100 OHM 1/10W ZD401 NC/UDZW5.6B +3V3SB_uP FB402 DV33 NC/BEAD Q402 C404 C403 OSDA0 9,19 NC/0.1UF16V NC/10uF/16V C402 +3V3SB_uP CN402 +3V3SB_uP 0.1UF16V +3V3SB_uP +3V3SB_uP +3V3SB_uP ISP PORT R405 R429 U406...
  • Page 58 RR1X2- SHELL1 OUT3 Q503 RR1X2+ OUT4 HDMI1_SDA NC/2N7002 SOT-23 DSDA_1 HDMI PORT 1 ㄏノ Acer 88T 340 19 U508 R507 100K OHM 1/10W TS5A3157DCKRE4 CEC_A R529 R501 1K OHM 1/10W +5V_HDMI1 HDMI_SEL 15,20 0 OHM 1/10W R508 100K OHM 1/10W...
  • Page 59 DV33 HDMI_3V3 L501 120 OHM C522 C523 C524 C525 C526 C527 C528 C529 C530 10UF16V 0.1UF16V 0.1UF16V 0.1UF16V 0.1UF16V 0.1UF16V 0.1UF16V 0.1UF16V 0.1UF16V HPD_SINK R509 HPDIN 14,20 0 OHM 1/10W HPD1 DSDA_1 DSCL_1 RR1XC- RR1XC+ RR1X0- RR1X0+ 3/24 Modify RR1X1- RR1X1+ RR1X2- RR1XC-...
  • Page 60 U601 TDA8932BTW R603 4.7K OHM 1/10W C601 1uF/25V SPK_L VSSD/HW VSSD/HW R608 5.1K OHM 1/10W C603 C614 0.1uF/25V IN1P OSCIO 330pF R604 4.7K OHM 1/10W C602 1uF/25V HVP1 IN1N HVP1 To SPK_L AMP_POWER C615 0.1uF/25V DIAG VDDP1 FB609 L602 R668 0 OHM 1/10W C616 0.015uF R622...
  • Page 61 R629 10K OHM 1/10W DV33 CN601 R630 HPDET# R601 HPDET# 0 OHM 1/10W 47K OHM 1/10W FB607 300 OHM C623 EarMuteB EarMuteB C625 10uF/10V FB608 300 OHM R632 HP-L R633 R634 0 OHM 1/10W C626 220uF/10V OP_PWRH 36K1/10W PHONEJACK 20 OHM 1/10W C627 C628 C629...
  • Page 62 TUNER_CVBS +5V_TUNER VIDEO OUT AFT OUT DIF2 DIF2 R761 100 OHM 1/10W IFT OUT 2 FAT_IN- DIF1 R758 100 OHM 1/10W L707 FAT_IN+ IF_AGC_OUT DIF1 R762 4.7K OHM 1/10W IFD OUT 1 IF_AGC C770 IF_AGC_OUT IF AGC 0.01uF +5V_TUNER SIF OUT L708 AUDIO OUT NEARLY MT5335...
  • Page 63 C761 22pF C701 FAT_IN- 1000pF L703 C737 NC/0.22uH C736 DV12_DM DVDD12 FAT_IN+ 1000pF FB706 Digital 1.8V Bypass Caps C769 BEAD 22pF C738 10uF/10V TUNER_SCL R750 TUNER_SCL1 18 0 OHM 1/10W TUNER_SDA R751 DV33 Digital 3.3V Bypass Caps DVDD33 TUNER_SDA1 18 0 OHM 1/10W FB707 C744...
  • Page 64 12/11 Modify TH701 CI_VCC CLOSE TO CI CONNECTOR CLOSE TO CI CONNECTOR CI_VPP U705 L702 NC/BEAD 10K OHM/NC 10K OHM/NC VIN1 OUT1 CI_VCC CI_VCC CI_VCC FB702 VIN2 OUT2 CI_VCC CI_VCC Q702 R795 OUT3 C702 C703 ME2301 R704 R705 R706 10uF/10V 0.1UF16V 0 OHM 1/8W R709...
  • Page 65 0.0082uF R915 10K OHM 1/10W U908 AO4449 -7A/-30V C907 0.47uF R7914 47K OHM 1/10W SY NC VOUT C7908 0.1uF/25V COMP ACER:R909,R912,R923 10K ohm ; L901 R7918 5.6K OHM 1/10W R922,R906 NC 10uH DV33 R7919 10K OHM 1/10W DV33 C934 C939...
  • Page 66 Power board R918 100R 1/4W C921 F902 0.001uF R919 +16V T 901 100R 1/4W L904 Jum per POWER X'FM R 3.5uH ZD920 R940 80T L22T 5 N RLZ18B R920 C917 C918 C922 150R 2W C920 100R 1/4W 470uF/25V 1000uF/25V 1000uF/25V 0.1uF R908 R943...
  • Page 67 PT 802 20".22Wㄏノ CN80 1 CONN C819 68p F/3 KV R805 +12V 10 0R 1/10W C820 CN80 2 ON/OFF D801 68p F/3 KV CONN L L414 8 Q80 5 PT 80 1 AO4 616 X'FM R R806 100 R 1 /1 0W L801 C8 16 22p F/6KV...

  • Page 68: Key Board

    Power Source Vol- Vol+ Menu T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL Acer Size 絬 隔 瓜 絪 腹 715T TPV MODEL TV2268W-AED Key Component MT5335 Key Pad PCB NAME 715T28981-B 称爹 <称爹>...
  • Page 69 C104 C102 0.1uF 10uF/10V 100pF/50V T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL Acer TV Size 絬 隔 瓜 絪 腹 <絬隔瓜絪腹> TPV MODEL TV2268W-AED Key Component MT5335 IR/LED PCB NAME 715T2982-D 称爹 <称爹>...

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At1946

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