AOC LE20A1140 Service Manual

19.5 led tv

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19.5"LED TV
Service
Service
Service
Description
Table of Contents............................................................1
Important Safety Notice...................................................2
Revision List.........................................................3
1. General Specification..................................................4
2. Operating Instructions............................................5
2.1 The Use of Remote Control...................................5
2.2 To Use the Menus................................................6
2.3 How to Connect................................................11
2.4 Front Panel Control Knobs.................................13
3. Input/ Output Specification....................................14
4. Mechanical Instructions.........................................16
5. Repair Flow Chart ..............................................19
6. PCB Layout ....................................................25
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
Copyright © 2014 by TPV Corporation. All rights reserved. Specifications are subject to change without notice.
No part of this publication may be reproduced in any form or means, without the prior written permission of TPV Corporation.
Otherwise we will reserve the right to investigate the legal responsibility.

TABLE OF CONTENTS

SAFETY NOTICE
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
Page
Description
6.1 Main Board..................................................25
6.2 Power Board..................................................27
6.3 IR Board.......................................................30
7. Adjustment..............................................................31
7.1 WB Adjustment............................................31
7.2 FW Upgrade.................................................32
8. Block Diagram..........................................33
9. Schematic Diagram..........................................35
9.1 Main Board..................................................35
9.2 Power Board..................................................45
9.3 IR Board........................................................47
10. Exploded View..............................................48
11. BOM List.....................................................50
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AOC LE20A1140
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Summary of Contents for AOC LE20A1140

  • Page 1: Table Of Contents

    19.5″LED TV AOC LE20A1140 Service Service Service TABLE OF CONTENTS Description Page Description Page Table of Contents..……........…..1 6.1 Main Board……...…………..….…….………..25 Important Safety Notice........……..2 6.2 Power Board……...…………..….…….………..27 Revision List…………………………………………………3 6.3 IR Board…...……………………………………..30 1. General Specification......……...…..4 7. Adjustment..............31 2. Operating Instructions………………...…….………..5 7.1 WB Adjustment……………………..……...………31 2.1 The Use of Remote Control…….…..……….……..5...
  • Page 2: Important Safety Notice

    Important Safety Notice Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service procedures recommended by AOC and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.
  • Page 3: Revision List

    Revision List Version Release Date Revision Instructions Customer Model TPV Model E20D41NSBTE7NN Feb.24,2014 Initial release LE20A1140 E20D41NSBTE6NN...
  • Page 4: General Specification

    1. General Specification...
  • Page 5: Operating Instructions

    2. Operating Instructions 2.1 The Use of Remote Control...
  • Page 6: To Use The Menus

    2.2 To Use the Menus...
  • Page 11: How To Connect

    2.3 How to Connect...
  • Page 13: Front Panel Control Knobs

    2.4 Front Panel Control Knobs...
  • Page 14: Input/ Output Specification

    3. Input / Output Specification D-Sub and HDMI Pin assignment D-Sub (CN101) HDMI1 (CN501) HDMI2(CN506) Signal Signal Signal TMDS Data2+ TMDS Data2+ Green TMDS Data2 shield TMDS Data2 shield Blue TDMS Data2- TDMS Data2- D/TXDC TMDS Data1+ TMDS Data1+ TMDS Data1 shield TMDS Data1 shield Red GND TMDS Data1-...
  • Page 16: Mechanical Instructions

    4. Mechanical Instructions 1. Remove the screws to remove STAND & BASE. 2. Remove the screws to remove REAR COVER.
  • Page 17 3. Disconnect the PINS marked in yellow .Remove the screws marked in red to remove MAIN BOARD, POWER BOARD and SPEAKERS. 4. Remove the screws to remove DECO and disconnect the pin to remove the IR Board.
  • Page 18 5. Remove the screws to remove BKT . 6. Panel.
  • Page 19: Repair Flow Chart

    5. Repair Flow Chart 1. No power No power (LED “Off”) Check the AC input and Power “On” the power is “ON”? Power board Replace the power board output=5.2V? Check the IR board and LED Replace the IR board Replace the main board...
  • Page 20 2. Can’t start Can’t start (LED Blue) Replace the power board Power board output=16V? Replace the main board Check the power key is under control? Replace the IR board Check the IR receiver is normal? Replace the main board Replace the Power board...
  • Page 21 3. Abnormal display Abnormal Display Reset the source Check the source Enter factory mode to do “EEPROM initial”&“Reset” Replace the main board Check the main board Check the LVDS cable Replace the LVDS cable Check the panel Replace the panel...
  • Page 22 4. No display No display (No LED) Check TV is under control and power Replace the main board on/off by remote control and power key? Check the backlight is “On”? Check the LVDS cable Check the B/L signal is available? Reinsert or replace the LVDS cable Replace main board...
  • Page 23 5. Sound problem No sound or sound abnormal Check the audio source connection and the TV system are correct? Reinsert the audio cable or change the TV system Check the TV is muted, adjust the volume or enter the menu to reset? Enter factory mode to do “Reset”...
  • Page 24 6. Remote control malfunction Remote Control malfunction Check the remote control battery is Replace the battery not properly placed or no power? Use the other remote controls Replace the remote control Whether the IR board is Replace the IR board abnormal? Replace the main board...
  • Page 25: Pcb Layout

    6. PCB Layout 6.1 Main Board 715G5749M03001004K...
  • Page 27: Power Board

    6.2 Power Board 715G5804P01W20001M...
  • Page 30: Ir Board

    6.3 IR Board 715G5772R01000004K...
  • Page 31: Adjustment

    7. Adjustment They only need adjust WB(Ypbpr’s Normal/Warm/Cool). 7.1 White Balance Adjustment 1. Enter into the factory mode:MENU+1+9+9+9+back 2. Take an example of adjust Ypbpr_Normal: a. Select item “Source”: Ypbpr and item “Color Temp”: Normal. b. Adjust gain of RGB to meet spec in the below setting of tim\pat. (COMPONENT mode: TIM = 314;...
  • Page 32: Fw Upgrade

    7.2 Firmware Instruction Step1:Change the software file name to MERGE.bin, Copy F/W to USB root directory Step2:TV Power On Step3:Insert USB to TV,then AC off/on Step4:Presses “Menu+456987+Recall”, click “yes”, TV auto upgrade. After USB F/W update OK, TV will power off. Step5:Power on, press “Menu+1999+recall”,then TV will enter factory menu, Check SW version ,if OK, then do reset .USB F/W update OK.
  • Page 33: Block Diagram

    8. Block Diagram Series TS DTV DEMOD Single terminal silicon tuner MSB1400 (LG TDST-H020F) Analog IF+/- LVDS DEMOD YPbPr MST6931XP AV Audio Headphone AMP APA2176A Headphone CVBS With ARC 5W SPK AUDIO AMP TI 31100 5W SPK KeyPad UART Remote Control...
  • Page 34 Without panel <= 3.5A DC-DC +1.2V_VDDC +5V_standby MST6931 Core Power APW7323 500mA +1V2 Demod Power G9141 115mA 3.3V_STANDBY 3.3V Demod Power AZ1117 P12V 500mA +1.8V_DDR MST6931 DDR Power AZ1117 150mA P24V/16V VDD33 MST6931 Power Use Power Board_G5827P0D, 170mA No 24V/16V 3.3V_TUNER Tuner Power AZ1117...
  • Page 35: Schematic Diagram

    9. Schematic Diagram 9.1 Main Board (715G5749M03001004K) From Power Board: System power control 24V : G5508(29"),G5193(39") +5V_Normal +5V_Standby 16V : G5309(19",22",24") TP19 PS_ON R705 100R CN701 BL_EN Q701 C772 AO3401A BL_PWM 470nF 16V R720 P12V +3.3V_Standby R780 47K TP20 C737 C736 TP18 100N 50V...
  • Page 36 Power control PWR_ON PWR_ON Backlight control SERIAL FLASH Sy stem-RST VBL-CTRL VBL_CTRL TP105 ARC_Det 11 HDMI-CEC IRIN R440 NC/0.05R BRI_ADJ-PWM0 TP106 TP104 BRI_ADJ-PWM0 4 HOTPLUGD LED-Red +3.3V_Standby LVDS signal TP107 TP103 +3.3V_Standby HDMID-CLKN RXO0- HDMID-CLKP KEY 1-SAR1 RXO0- +3.3V_Standby RXO0+ TP102 HDMID-RX0N PANEL_ON RXO0+ RXO1- TP101...
  • Page 37 Panel Power RXO0- 12V : G5508(29"),G5193(39") RXO0- TP136 RXO0+ RXO0+ TP137 5V : G5309(19",22",24") RXO1- RXO1- TP138 RXO1+ RXO1+ TP139 RXO2- FB416 300R 4A RXO2- TP140 RXO2+ RXO2+ TP141 RXOC- P12V RXOC- TP142 RXOC+ RXOC+ TP143 RXO3- RXO3- TP144 RXO3+ +5V_Standby TP127 RXO3+...
  • Page 38 YPBPR Video/Audio IN +5V_Normal CVBS Out TP186 Close MST6831(U401) side FB102 C103 C104 NC/60 OHM TP166 R102 C102 NC/100N 16V NC/1uF 10V 47nF 16V CN405 R103 TP167 R104 NC/220R 1% ZD102 ZD103 ZD104 C105 2Vp-p NC/MLVG0402 NC/MLVG0402 NC/MLVG0402 47nF 16V R105 TP168 TP187...
  • Page 39 HDMI_A with ARC function HDMI1_D From Main Chip (V/T H:8.5mm) CN506 HDMIA-RX2P (R/A H:8.4mm) HDMIA_D2+ HDMIA-RX2N HDMIA_D2- HDMID_D0+ HDMIA-RX1P R527 0R05 OHM TMDSD0+ HDMIA_D1+ HDMID_D0- R528 0R05 OHM HDMIA-RX1N CN501 TMDSD0- HDMIA_D1- HDMIA-RX0P HDMIA_D0+ HDMID_D1+ HDMIA-RX0N R525 0R05 OHM SHLD0 TMDSD1+ HDMIA_D0- HDMIA_D2+...
  • Page 40 Keyboard and LED PC AUDIO IN From Main Chip +3.3V_Standby TP234 KEY 1-SAR1 KEY 1-SAR1 R1061 IR_IN_2 IRIN NC/0R05 OHM TP237 IRIN IR_SW_IN Q423 TP238 AO3401 R1060 TP218 TP235 NC 0R05 OHM TP220 CN102 LED-R VGA_L_IN UART-TX UART-TX VGA_R_IN LED-Red IR_OUT UART-RX LED-Red...
  • Page 41 IF_AGC Control Circuit Close Tuner (TU101) side Tuner Power 3.3V_TUNER IF_AGC from Demod R101 100R IF_AGC 300mA To tuner 1K_100MHz/400_400MHz +5V_Normal C141 3.3V_TUNER U166 100N 16V 3.3V_TUNER VOUT TP249 Tuner_GND IF_AGC trace shielding by GND C140 R161 C127 NC 100N 16V C129 10UF 10V C128...
  • Page 42 +3.3V_Standby Detect HDMI ARC C478 R490 NC 100N 16V ARC_Det ARC_Det TP261 R491 HDMIA_CON5V 4.7K HDMIA_CON5V 8 Q411 MMBT3904 Demod_3V3 +3.3V_Standby +1V2 TP285 TP286 TP287 TP288 place close to U101 C460 C465 100N 16V RP401 100N 16V f or DTV 33 OHM +-5% 1/16W f or DTV TS1_SY NC...
  • Page 43 AMP_STB AMP_MUTE +3.3V_Standby TP348 Low: Mute disablde R2903 High: Mute enable NC/10K+-5%1/16W TP289 TP290 TP291 R2904 AMP_MUTE Q2901 AUDIO_EN 0R05 1/16W R2905 MMBT3904 R0402 10K+-5%1/16W Note: AUD_PVDD R628 DC power 24V/16V to audio amp, 16ohm load NC/100 OHM 1/10W L: 47uH_073G253S 83 TP293 R2909 +3.3V_Standby...
  • Page 44 Headphone Amp +5V_Normal TP347 AV_AUOUTR3 FB601 AV_AUOUTR3 5 AV_AUOUTL3 60 OHM AV_AUOUTL3 5 C601 C602 R736 100N 16V 10UF 10V U606 TP346 C605 1.5nF 50V C603 TP332 TP343 TP344 TP345 NC/ 1.5nF 50V C604 R603 AV_AUOUTR3 1uF 10V R602 0R05 OHM C606 APA2176A 1uF 10V...
  • Page 45: Power Board

    9.2 Power Board (715G5804P01W20001M) BD9101 D9109 SR506 HS9104 GBL08-07 HEAT SINK-NC D9108 +16V SR506 D9101 ZD9101 L9101 FMW-2156-NC 2.8A GDZJ18B +5.2V 093G 39A0852T-->18B C9111 093G 39G 7----->15B C9121 330UF 25V R9130 330UF 25V C9112 470R R9129 100N 50V RV9901 470 OHM 1/4W C9110 C9109 100N 50V...
  • Page 46 FB9905 FB9907 SR310-29 BEAD 071G 55 29-->JUMPER 095G 90 23 JUMPER VLED+ L8102 D8101 47uH +16V C8116 47UF 100V-NC 220P 50V-NC C8105 C8101 C8106 C8102 C8113 R8116 100N 50V 330UF 25V Q8101 1NF-NC 47UF 100V 100K 1% C8107 AO4486 220P 50V-NC OVP 68V AO4482L 6A/100V...
  • Page 47: Ir Board

    9.3 IR Board (715G5772R01000004K) 3V3SB R301 2K2 1/10W 5% 3V3SB LED301 3V3SB R202 R201 100R 1/10W 5% NC/2K7 1/16W 5% D201 Close to U201 R302 1K 1/10W 5% BAV99 C204 Q301 BC847C U201 1UF16V CN201 LED_R 3V3SB CONN TSOP75436WTT C203 NC/1N 50V C201 D202...
  • Page 48: Exploded View

    10. Exploded View...
  • Page 49 Item Part No Description 750GBV195100B6N000 LCD TPM195WD1-RTN01 000B WH TPV P33T0604ALD01C0100 LENS TV20W9aa51 P34T2050ADTZ1L0100 DECO_BEZEL IRPFDAB1Q IR BOARD 378G0060566HBE 8 OHM 6W 100 x 27 0 UNIT X15T905110100000BL BKT_MID Q52G18010TV18200ZA INSULATING SHEET CBPFD3QSX5Q MAIN BOARD X15T905230100000LH BKT_IO X40G2013020X0700XY SIDE LABEL PLTVDC421XXC1Q POWER BOARD Q15T141110100000ZA...
  • Page 50: Bom List

    MCU ASSY SMTF-U402 100TAMVA001S2X MCU ASSY-356G2233073 U402 356G2233073 FLASH W25Q64FVSSIG 64MB SOIC-8 E750 LCA195RTN01A12AX0W TPM195WD1-RTN01 000B 750GBV195100B6N000 Q11G701017000L00JY PCB-SUPPORT Q40G0004615A19 OTHER LABEL ECO LABEL LE20A1140 Q44GAA0261501A00JA ARTWORK CARTON LE20A1140-30 Q45G88010TV08500WN PROTECT BAG Q45G99010TV06600WN PROTECT BAG Q52G130118600000YY TAPE Q52G1501150523AWBK TAPE_INSULATING Q52G160119100A00YY TAPE...
  • Page 51 WARRANTY CARD SA all region 040G 58162435A MANUAL P/N LABEL Q40G 581689 4B SN LABEL(58x35mm) Q40G0001624 5A CARTON LABEL 60*60mm Q40G020061542A RATING LABEL LE20A1140 EPI X40G0001624 2A Label for screw pe bag X40G0001624 2A Label for screw pe bag CBPFD3QSX5Q CONVERSION BOARD Z40G0002ALL01A...
  • Page 52 R605 061G0402000 JF RST CHIPR MAX0R05 1/16W FENGHUA R601 061G0402000 JF RST CHIPR MAX0R05 1/16W FENGHUA R521 061G0402000 JF RST CHIPR MAX0R05 1/16W FENGHUA R602 061G0402000 JF RST CHIPR MAX0R05 1/16W FENGHUA R532 061G0402000 JF RST CHIPR MAX0R05 1/16W FENGHUA R524 061G0402000 JF RST CHIPR MAX0R05 1/16W FENGHUA...
  • Page 53 R707 061G0402102 JT RST CHIP 1K 1/16W 5% TZAI YUAN R709 061G0402102 JT RST CHIP 1K 1/16W 5% TZAI YUAN R704 061G0402102 JT RST CHIP 1K 1/16W 5% TZAI YUAN R2905 061G0402103 JF RST CHIPR 10KOHM +-5% 1/16W FENGHUA R137 061G0402103 JT RST CHIP 10K 1/16W 5% TZAI YUAN R443...
  • Page 54 R122 061G0402330 JI RST 0402 33R 5% 1/16W R102 061G0402330 JI RST 0402 33R 5% 1/16W R781 061G0402331 JF RST 0402 330R 5% 1/16W R622 061G04023321DF RST CHIPR 0402 3.32K 0.5% 1/16W FENGHUA R439 061G0402333 JT RST CHIP 33K 1/16W 5% TZAI YUAN R424 061G0402472 JT RST CHIP 4K7 1/16W 5% TZAI YUAN...
  • Page 55 R2911 061G0603101 JF RST CHIPR 100 OHM +-5% 1/10W FENGHUA R599 061G0603102 JT RST CHIP 1K 1/10W 5% TZAI YUAN R607 061G0805150 JT RST CHIP 15R 1/8W 5% TZAI YUAN R608 061G0805150 JT RST CHIP 15R 1/8W 5% TZAI YUAN R699 061G1206000 JT RST CHIPR MAX0R05 1/4W TZAI YUAN...
  • Page 56 C718 065G0402105A5K CAP 0402 1uF 10% 10V X5R LMK105 BJ105KV C604 065G0402105A5K CAP 0402 1uF 10% 10V X5R LMK105 BJ105KV C443 065G0402105A5K CAP 0402 1uF 10% 10V X5R LMK105 BJ105KV C607 065G0402105A5K CAP 0402 1uF 10% 10V X5R LMK105 BJ105KV C725 065G0402105A5K CAP 0402 1uF 10% 10V X5R LMK105 BJ105KV...
  • Page 57 C111 065G0603225A5K CAP MLCC 0603 2.2uF K 10V X5R C116 065G0603225A5K CAP MLCC 0603 2.2uF K 10V X5R C610 065G0603225A5K CAP MLCC 0603 2.2uF K 10V X5R C439 065G060333412K CAP 0603 330NF 10% 16V X7R C772 065G060347412K CAP 0603 470NF 10% 16V X7R C774 065G0603475A5K CAP CHIP 0603 4.7UF K 10V X5R...
  • Page 58 L703 073G 12610010M CHIP IND 10UH 10% 0.025A 1R MGFI3216D10 L701 073G253S 68 H SMD CHOKE 2.2UH 30% 2.04A 0.031R SPI530L L602 073G253S 89 M SMD CHOKE 22uH 20% 0.0723R 2.6A L603 073G253S 89 M SMD CHOKE 22uH 20% 0.0723R 2.6A L604 073G253S 89 M SMD CHOKE 22uH 20% 0.0723R 2.6A...
  • Page 59 E715 715G5772R01000004S IR BOARD PCB 2nd Source PLTVDC421XXC1Q ADAPTER BOARD Z40G0002ALL01A OTHER LABEL CN8102 033G8021 2E L INVERT CONN 3.5mm 2P CN8102 033G8021 2E XY CONNECTOR IC9102 056G 139 8 Photo-Coupler PS2561DL1-1 CTR Q100~200% IC9102 056G 139 9 IC EL817M(X) photocoupler DIP-4 C9901 063G107M47410M CAP X2 470NF 20% 275V R46KI3470HAP1M...
  • Page 60 R9142 061G0805000 JF RST CHIPR 0 OHM +-5% 1/8W FENGHUA R8131 061G0805000 JT RST 0805 0.05R MAX 1/8W R9142 061G0805000 JT RST 0805 0.05R MAX 1/8W R8129 061G0805000 JT RST 0805 0.05R MAX 1/8W R8130 061G0805000 JT RST 0805 0.05R MAX 1/8W R9143 061G0805000 JT RST 0805 0.05R MAX 1/8W...
  • Page 61 R8110 061G12061003FF RST CHIPR 100KOHM +-1% 1/4W FENGHUA R8110 061G12061003FT RST 1206 100K 1% 1/4W SMD1206100KF R8116 061G12061003FY RST CHIPR 100KOHM +-1% 1/4W YAGEO R8113 061G12061809FI RST 1206 18R 1% 1/4W R8113 061G12061809FT RST 1206 18R 1% 1/4W R9140 061G1206220 JF RST CHIPR 22 OHM +-5% 1/4W FENGHUA R9117 061G1206220 JF...
  • Page 62 C9104 065G080510432K CAP CHIP 0805 0.1UF K 50V X7R C9106 065G080522131J CAP CHIP 0805 220PF J 50V NPO C9106 065G080522131J CAP CHIP 0805 220P 50V NP0 +/-5% C9107 065G080522232K CAP 0805 2.2NF 10% 50V X7R C9123 065G080522232K CAP 0805 2.2NF 10% 50V X7R C9107 065G080522232K CAP CHIP 0805 2N2 50V X7R +/-10%...
  • Page 63 J924 095G 90 23 JUMP WIRE - - C9906 065G306K10123R CAP Y1 100PF 10% 250V Y5P J916 095G 90 23 JUMP WIRE - - C9105 067G 5154707KB EC 47UF 20% 50V 6.3*11 J925 095G 90 23 JUMP WIRE - - C9902 065G306K47123R CAP Y1 470PF 10% 250V Y5P...
  • Page 64 D9103 093G 60964 RECTIFIER PS1010R T/B 1A 1000V DO-41 ZD9101 093G 39G 5 ZENER MTZJ15B 15V 0.5W DO-35 C9906 065G306K1012WR CAP Y1 100PF 10% 250V Y5P CT7-Y1-250V-06 C9907 065G306K1012WR CAP Y1 100PF 10% 250V Y5P CT7-Y1-250V-06 P33T0604ALD01C0100 LENS TV20W9aa51 P34T1027ADT01L0100 STAND TV20W9aa51 NA NA P34T1028ADT01L0100 BASE TV20W9aa51 NA NA...

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