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AOC A20S431 Service Manual

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LCD TV A20S431
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS
BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY
OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES,
ERRORS OR OMISSIONS.

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  • Page 1 AOC A20S431 LCD TV A20S431 THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES,...

  • Page 2: Revision List

    AOC A20S431 Revision List Version Release Date Revision Instructions TPV Model Oct.-10-2005 Initial Release EAA5MNNKC3ACTM...

  • Page 3: Table Of Contents

    AOC A20S431 Table Of Contents .....…………....……..........…………......Revision List Table Of Contents .....................…………......1. Specification For LCD ................…………......1.1 General Specifications ....................…………..…. 1.2 LCD TV Description ..............…………...………......1.3 Interface Connector ....................…………..…. 2. Precautions And Notice ..................……………..………… ....................…………..…. 2.1 Assembly Precaution 2.2 Operating Precaution ....................…………..….

  • Page 4: Specification For Lcd

    AOC A20S431 1. Specifications For LCD TV 1.1 General Specifications Items Specification Panel Type 20” CMO V201V1-T01 panel Driver Element a-si TFT active matrix 20” screen Screen Size Aspect Ratio 4: 3 Resolutions 640 x 480(SVGA) Active Display Area H x V...
  • Page 5 AOC A20S431 OPERATING INSTRUCTIONS THE USE OF REMOTE CONTROL POWER MUTE Press to turn on/off the Temporarily interrupt the TV. The TV is never sound or restore it. completely powered off unless it is physically unplugged. DISPLAY Press this button to display Channel 0~9/100 Digit buttons number on the right-top corner.
  • Page 6 AOC A20S431 TO USE THE MENU 1. Press the MENU button to display each menu. 2. Use the cursor up/down to select a menu item. 3. Use the cursor left/right to enter a submenu or enable/disable the function. 4. Press the MENU button to exit the menu.
  • Page 7 AOC A20S431 TV Setup 1. AIR/CATV for different TV input solution, RF and cable. 2. Auto searching is used for searching all TV program channels. After finishing search and exiting, the machine will save the program automatically, you can also press “menu” to break the searching, but only the searched programs are saved when the machine exits searching.
  • Page 8 AOC A20S431 V-CHIP Setup Select V-Chip on OSD then enter 4 digits of pin number. Initial pin number is “0000”. If you enter an incorrect pin number “Error” message will be displayed. It is the parental control function (V-chip). It is used to block program viewing based on the ratings by the broadcaster.
  • Page 9 AOC A20S431 D. CHANGE PIN Personal Identification Number is for change password to control the V-chip setup; it‟s included three steps. ENTER PIN to enable this function, then ENTER NEW PIN to change a new one. After that COMFIRM NEW PIN.
  • Page 10 AOC A20S431 CONNECT PERIPHERAL EQUIPMENT FRONT PANEL CONTROL KNOBS Power Key⑦ : Press to turn on or off the TV. MENU Key⑥ : Press to show the OSD menu and exit OSD menu at the TV. Down / Up Key⑤④ : Press to perform select function and channel.
  • Page 11 AOC A20S431 VIDEO RECORDER How to connect 1. Connect the supplied antenna cable to the RF IN port of your VCR. 2. Connect another RF cable ① from the output RF of your VCR to the Antenna input of your TV. Better quality when playing from your VCR can be obtained if you also connect the Video, Audio LEFT AND right (only for stereo equipment) cables ⑤...
  • Page 12 AOC A20S431 TIPS Care of the screen Do not rub or strike the screen with anything hard as this may scratch, mar, or damage the screen permanently. Unplug the screen before cleaning the screen. Dust the TV by wiping the screen and the cabinet with a soft, clean cloth.

  • Page 13: Lcd Tv Description

    AOC A20S431 1.2 LCD TV Description The LCD TV will contain a main board, a power board, a tuner board, a key board, IR board, and a headphone board. The main board and power board will house the flat panel to control logic I2C bus, 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 14: Precautions And Notice

    AOC A20S431 2. Precautions And Notices 2.1 Assembly Precaution 1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD panel surface by touching with bare hands (Polarize film, surface of LCD panel is easy to be flawed) In the LCD panel, the gap between two glass plates is kept perfectly even to maintain display characteristic and reliability.

  • Page 15: Mechanical Instructions

    AOC A20S431 3. Mechanical Instructions 1). Lay TV on a flat, soft and clean surface. 2). Remove the 4 screws to remove stand and base. 3). Remove the 8 screws to remove rear cover.
  • Page 16 AOC A20S431 4). Remove 3 screws to remove BKT-CARD READER. 5). Remove 3 screws to remove shield. 6). After removing the shield, disconnect the connecter wire with BKT- CARD READER and power board.
  • Page 17 AOC A20S431 7). Disconnect the 20-pin header, and remove the 1 screw to remove tuner board. 8). Disconnect the connector wire. 9). Remove the 4 screws, and disconnect the connector wire to remove main board.
  • Page 18 AOC A20S431 10). Remove the 6 screws to remove power board. 11). Remove the 11 screws to remove key board and two speakers.

  • Page 19: Bom List

    AOC A20S431 4. BOM List Location Part NO Description Quantity Unit CBPFAA5KMNACT CONVERSION BOARD PWTV2066CM1 20" POWER BOARD TUPFAAA1 TUNER BOARD FOR 20" TV 15T5930 8 BKT CONNECTOP 15T8024 1 AC-SOCKET 15T8152 7 MAIN FRANE 34T1522 GM L HANDLE 34T1529 GM L...
  • Page 20 AOC A20S431 Q1T 340 12 47 SCREW T4X12 Q1T 930 6128 SCREW T3X6 Q1T1030 12128 SCREW 705G 780 77 04 SW901 ASS'Y FOR ROHS 705GAA5FB34002 BACK COVER ASS'Y 750VVMA1T01 1 CMO 20.1' C4 PANEL SMTFAA5KMNACT MAIN BOARD CN113 33T802420C H...
  • Page 21 AOC A20S431 RP202 61V 125220 8 CHIP ARRAY 22 OHM 1/16W R210 61V0603000 CHIPR 0OHM +-5% 1/10W R311 61V0603000 CHIPR 0OHM +-5% 1/10W R208 61V0603101 CHIPR 100 OHM+-5% 1/10W R313 61V0603101 CHIPR 100 OHM+-5% 1/10W R408 61V0603101 CHIPR 100 OHM+-5% 1/10W...
  • Page 22 AOC A20S431 R418 61V0603202 CHIP 2K OHM 1/16W R419 61V0603202 CHIP 2K OHM 1/16W R420 61V0603202 CHIP 2K OHM 1/16W R421 61V0603202 CHIP 2K OHM 1/16W R207 61V0603220 CHIPR 22 OHM+-5% 1/10W R447 61V0603220 CHIPR 22 OHM+-5% 1/10W R458 61V0603220...
  • Page 23 AOC A20S431 FB409 61V1206000 4 0 OHM 4A 1/4W C207 65T0603100 31 CHIP 10PF 50V NPO C210 65T0603100 31 CHIP 10PF 50V NPO C406 65T0603101 31 CHIP 100PF 50V NPO C407 65T0603101 31 CHIP 100PF 50V NPO C408 65T0603101 31...
  • Page 24 AOC A20S431 C218 65T0603104 32 CHIP 0.1UF 50V X7R C222 65T0603104 32 CHIP 0.1UF 50V X7R C223 65T0603104 32 CHIP 0.1UF 50V X7R C226 65T0603104 32 CHIP 0.1UF 50V X7R C228 65T0603104 32 CHIP 0.1UF 50V X7R C231 65T0603104 32 CHIP 0.1UF 50V X7R...
  • Page 25 AOC A20S431 C109 65T0603221 31 CHIP 220PF 50V NPO C110 65T0603221 31 CHIP 220PF 50V NPO C240 65T0603224 17 CHIP 0.22UF 16V Y5V C241 65T0603224 17 CHIP 0.22UF 16V Y5V C242 65T0603224 17 CHIP 0.22UF 16V Y5V C247 65T0603224 17 CHIP 0.22UF 16V Y5V...
  • Page 26 AOC A20S431 FB402 71T 56G301 EA CHIP BEAD 300 OHM 0805 FB403 71T 56G301 EA CHIP BEAD 300 OHM 0805 FB404 71T 56G301 EA CHIP BEAD 300 OHM 0805 FB102 71T 57G301 EA CHIP BEAD FB103 71T 57G301 EA CHIP BEAD...
  • Page 27 AOC A20S431 C232 67T215L471 4N GP KY25VB470M-L10*16 C916 67T215L471 4N GP KY25VB470M-L10*16 C905 67T215S10115N GP EC CAP 450V/100 FB901 71T 55 29 BEAD L904 73L 174 26LSG COMMON CHOKE L902 73L 174 50 LH LINE FILTER L903 73T 253 91 LS...
  • Page 28 AOC A20S431 Q211 57T 759 2 RK7002 Q213 57T 759 2 RK7002 Q214 57T 759 2 RK7002 Q215 57T 759 2 RK7002 Q216 57T 759 2 RK7002 Q217 57T 759 2 RK7002 Q203 57T 760 4 DTA144WKA BY ROHM SMT...
  • Page 29 AOC A20S431 R227 61V0603510 2F 51K 1% R224 61V0603513 CHIP 51K OHM 1/10W R217 61V0603680 2F CHIP 68KOHM 1% 1/10W R116 61V0603821 CHIP 820 OHM 1/16W R222 61V0603823 CHIPR 82KOHM +-5% 1/16W R216 61V0603912 CHIP 9.1K OHM 1/16W C103 61V0805000...
  • Page 30 AOC A20S431 R906 61V1206105 CHIP 1MOHM 5% 1/4W R907 61V1206105 CHIP 1MOHM 5% 1/4W R910 61V1206221 CHIP 220 OHM 5% 1/8W R921 61V1206301 CHIP 300 OHM 5% 1/8W R908 61V1206339 CHIP 3.3OHM 1/4W R919 61V1206470 CHIP 47OHM 5% 1/4W R920...
  • Page 31 AOC A20S431 C246 65T0603562 32 CHIP 5600PF 50V X7R C250 65T0603562 32 CHIP 5600PF 50V X7R C230 65T0603682 32 CHIP 0.0068UF 50V X7R 0 C910 65T0805102 31 1000PF 50V NPO C925 65T0805103 22 GP CHIP 0.01UF 25V X7R 080 C102 65T0805104 32 CHIP 0.1U 50V X7R...
  • Page 32 AOC A20S431 D905 93T 6432V LL4148-GSO8 SMD BY VISH D906 93T 6432V LL4148-GSO8 SMD BY VISH ZD901 93T 39S 20 T RLZ22B LLDS ZD201 93T 39S 24 T RLZ 5.6B LLDS ZD202 93T 39S 24 T RLZ 5.6B LLDS ZD204 93T 39S 24 T RLZ 5.6B LLDS...
  • Page 33 AOC A20S431 96G 29 6 SHRINK TUBE UL/CSA 90V 425 5 HEAT SINK D910 93T 60247 FME-220A D911 93T 60247 FME-220A M1T1730 8128 SCREW M3x8 CN901 87G 501 19 RF AC SOCKET 95G 900539 WIRE HARNESS 96G 29 6 SHRINK TUBE UL/CSA...
  • Page 34 AOC A20S431 R662 61V0603103 CHIPR 10K OHM+-5% 1/10W R663 61V0603103 CHIPR 10K OHM+-5% 1/10W R664 61V0603103 CHIPR 10K OHM+-5% 1/10W R665 61V0603103 CHIPR 10K OHM+-5% 1/10W R666 61V0603103 CHIPR 10K OHM+-5% 1/10W R667 61V0603103 CHIPR 10K OHM+-5% 1/10W R668 61V0603103...
  • Page 35 AOC A20S431 C680 65T0603103 32 CHIP 0.01UF 50V X7R C683 65T0603103 32 CHIP 0.01UF 50V X7R C602 65T0603104 32 CHIP 0.1UF 50V X7R C614 65T0603104 32 CHIP 0.1UF 50V X7R C616 65T0603104 32 CHIP 0.1UF 50V X7R C618 65T0603104 32 CHIP 0.1UF 50V X7R...
  • Page 36 AOC A20S431 C678 65T0603220 31 CHIP 22PF 50V NPO C650 65T0603221 31 CHIP 220PF 50V NPO C679 65T0603221 31 CHIP 220PF 50V NPO C646 65T0603331 31 CHIP 330PF 50V NPO C647 65T0603331 31 CHIP 330PF 50V NPO C607 65T0603470 31...
  • Page 37 AOC A20S431 36T 426 KN 4C SPEAKER GRILL IRPFAAA2 LCD TV 20" IR BOARD KEPFAAKA1 KEY BOARD 11T 176 1 RL CABLE MOUNT FTC4 12T 394 3 RUBBER FOOT 15T6184 1 Kensington lock 15T8153 1 BKT-HINGE 15T8154 1 BKT-BASE1 33T4822ARG 1L...
  • Page 38 AOC A20S431 SW106 77G 600 1GCJ TACT SWITCH TSPB-2 SW107 77G 600 1GCJ TACT SWITCH TSPB-2 81T 12 2 GP GP36032ME/50-ZO R101 61V0805221 1F CHIP 22KOHM R103 61V0805221 1F CHIP 22KOHM R102 61V0805511 1F CHIP 51K OHM R104 61V0805511 1F...

  • Page 39: Trouble Shooting

    AOC A20S431 5.Trouble Shooting Defect Mode Failure Analysis Repair Testing Missing Line Abnormal Display Bright Dot Dark Dot Light Leakage Mura Check Panel Panel Change Image Sticking Dot Defect Brightness Spot Dot Defect Particle No display Check Power Board Change Power Board...
  • Page 40 AOC A20S431 Noise Check Single Cable Change Single Cable Flicker Check Main board Change Main board Change Panel Check Panel Abnormal Check Main board Change Main board Gray Check Panel Change Panel Check LVD Cable Change LVDS Cable R\G\B Display...
  • Page 41 AOC A20S431 LED Display Change Keyboard or LED Off Abnormal Main board or wire Change Keyboard or LED Dark Main board Change Keyboard or LED Abnormal Main board or wire Change Keyboard or LED Flicker Main board or wire Abnormal...
  • Page 42 AOC A20S431 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 43: Pcb Layout

    AOC A20S431 6. PCB Layout 6.1 Main Board...
  • Page 44 AOC A20S431...

  • Page 45: Power Board

    AOC A20S431 6.2 Power Board...

  • Page 46: Tuner Board

    AOC A20S431 6.3 Tuner Board...

  • Page 47: Key Board

    AOC A20S431 6.4 Key Board...

  • Page 48: Ir Board

    AOC A20S431 6.5 IR Board...

  • Page 49: Headphone Board

    AOC A20S431 6.6 Headphone Board...

  • Page 50: Block Diagram

    AOC A20S431 20” AOC Main Block Diagram (USA) 7. Block Diagram 7.1 Main board U401 20 inch NT68521-E VIDEO 1 Panel Scaler U201 S-VIDEO VPC 3230 Decoder ANT INT Philips Tuner FQ1236 MK3 U301 V-CHIP POWER Z86129 SDA/SCL AC100 ～240V...

  • Page 51: Power Board

    AOC A20S431 7.2 Power Board 20” AOC TV Power Block...

  • Page 52: Exploded View

    AOC A20S431 7.3 Exploded View...
  • Page 53 33T4832 CLIP CABLE M1V 330 4128 HINGE/CV ST-M 36T426-1 SPEAKER GRIL Q1V 340 12 47 REAR COCER/BEZEL 33V6302 PC PLATE ON TOP FOR AOC ID1_FUN_KEY Q1V 930 6128 BKT CONN/MAIN BRD M1V 330 4128 BKT CARD READER+SLD B1L2340 12120 SPEAKER/BEZEL...

  • Page 54: Schematic Diagram

    AOC A20S431 8. Schematic Diagram 8.1 Main Board CN103A JACK L201 C201 0.68u VIDEO CVBS1 C202 AGND AUDIO_O_L C203 AUDIO_O_R VD_HS AGND C204 C205 C206 R201 470p 470p C207 +3.3VS AGND L202 C208 0.68u R202 X201 SVIDEO_Y 20.25MHz C209 C210...
  • Page 55 AOC A20S431 +5 VS C 3 0 1 C 3 0 6 1 0 u /1 6 V 0 .1 u FB3 0 1 +5 VS AG N D B0 8 0 5 /6 0 0 R 3 0 1...
  • Page 56 AOC A20S431 FB408 FB409 CN113 TUNER_DET VOLUME IICSCL MUTE IICSDA STANDBY AUDIO_O_R AUDIO_O_L SEL1 SEL2 TUNER_CTRL TUNER_CVBS 8x2PIN/2.0mm DGND...
  • Page 57 AOC A20S431 R 4 0 1 R 4 0 2 R 4 0 3 R 4 0 4 4 .7 k 4 7 k 4 7 k Q 4 0 1 MU TE R 4 0 5 MMBT3 9 0 4...
  • Page 58 AOC A20S431 C N 1 1 5 D G N D D G N D L 2 0 6 3 0 0 O H M PAN EL _ VD D C P2 0 3 2 2 p F C 6 6 4 D ISP_ H S 0 .1 u F...
  • Page 59 AOC A20S431 2 .5 V 3 .3 V FB4 0 1 AD C _ VAA 3 .3 V B0 8 0 5 /6 0 0 C 4 2 0 C 4 2 1 C 4 2 2 4 7 u /1 6 V 0 .1 u...
  • Page 60 AOC A20S431 maybe add power core for EMI U 1 0 4 C N 1 0 2 1 2 V SI8 0 5 0 /( L M2 5 9 6 S- 5 .0 ) 3 .3 VS PO W ER _ J AC K...

  • Page 61: Power Board

    AOC A20S431 8.2 Power Board...
  • Page 62 AOC A20S431...
  • Page 63 AOC A20S431...

  • Page 64: Tuner Board

    AOC A20S431 8.3 Tuner Board TU100 TUNER ANT_Cable TUNER_SIF R640 TUNER_SCL C601 R603 TUNER_SDA R641 0.01u R642 R602 0 1206 NC FB613 600 OHM C665 C666 C668 100uF/16V 0.1u C667 0.1u 100uF/16V Q601 FB612 PMBS3904 600 OHM R604 R605 0£[ 1/16W...
  • Page 65 AOC A20S431 U602 FB603 12VT AZ1117H-ADJ B0805/600 +8VA R607 C612 330u/16V C618 C619 C617 0.1u 0.1u 100u/16V R608 +12V CN115 AMP_VOLUME C613 C614 100u/16V 0.1u TUNER_SCL AMP_MUTE TUNER_SDA AMP_STBY ASEL_O_L ASEL_O_R C615 C616 TUNER_EN TUNER_VIDEO 100u/16V 0.1u 10*2PIN/2.0mm R636 +12V...
  • Page 66 AOC A20S431 PG N D C 6 2 1 C 6 2 2 C 6 8 8 R O U T- 0 .0 0 1 u F 0 .0 0 1 u F L O U T- L O U T+...
  • Page 67 AOC A20S431 C 6 3 3 1 0 0 p TU N ER _ SIF R 6 2 2 C 6 3 7 C 6 5 5 C 6 3 5 C 6 3 6 5 6 p 2 2 p...

  • Page 68: Key Board

    AOC A20S431 8.4 Key Board D101 SW102 SOURCE R101 2.2k SW103 CN102 MENU R102 5.1k SW104 K_AD0 CH_DN K_AD1 K_GND SW105 CH_UP 4PIN/2.0mm R103 2.2k SW106 VOL_UP R104 5.1k SW107 VOL_DN SW101 POWER 715T1453 A K2 Title <Title> Size Document Number <Doc>...

  • Page 69: Ir Board

    AOC A20S431 8.5 IR Board FB101 600 OHM R103 150 OHM C101 C102 D102 0.1uF 0.1uF DATA FB102 C103 CN103 600 OHM 100pF IR_VCC IR_OUT D101 R101 R102 CONN 715T1658 Title <Title> Size Document Number <Doc> <Rev Code> Date: Tuesday , August 02, 2005...

  • Page 70: Headphone Board

    AOC A20S431 8.6 Headphone Board 2.2UF 16V MODE PHONEJACK 4 HEADER 2.2UF 16V 715T1381-1B Title <Title> Size Document Number <Doc> <Rev Code> Date: Tuesday , September 06, 2005 Sheet...

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