AOC L19WH Service Manual
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AOC L19WH Service Manual

AOC L19WH Service Manual

19" lcd color monitor
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19" LCD Color Monitor
Service
Service
Service
Description
Table Of Contents......................................................1
Revision List........................................................2
1. Monitor Specification...............................................3
2. LCD Monitor Description.....................................4
3. Operation Instruction............................................5
3.1. General Instructions..................................................5
3.2. Control Button......................................................5
3.3 Adjusting the Picture..........................................7
4. Input/Output Specification.......................................9
4.1. Input Signal Connector.........................................9
4.2. Factory Preset Display Modes.................................9
4.3. Panel Specification...............................................10
5. Block Diagram.....................................................12
5.1 Software Flow Chart.........................................12
5.2.Electrical Block Diagram....................................14
6. Schematic................................................................16
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 ELECTRONIC
EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

TABLE OF CONTENTS

Page Description
6.1 Main Board....................................................16
6.2 Power Board...............................................21
6.3 Key Board..............................................23
6.4 Audio Board..............................................24
7. PCB Layout..........................................................25
7.1. Main Board.........................................................25
7.2. Power Board........................................................27
7.3. Key Board..........................................................29
7.4. Audio Board......................................................30
8. Maintainability....................................................31
8.2. Trouble Shooting................................................31
10. Monitor Exploded View.....................................39
11. BOM List..............................................................40
SAFETY NOTICE
1
No Brand L19WH
Horizontal Frequency
30 kHz-80 kHz
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Do you have a question about the L19WH and is the answer not in the manual?

Questions and answers

Audrey
March 16, 2025

I can only listen thru my earphones My monitor has no sound

0
1 comments:
Mr. Anderson
March 16, 2025

The AOC L19WH monitor may have no sound due to the following reasons:

1. Audio Output Issue: The monitor has an audio output rated at 3.0W rms per channel, but if external speakers or headphones are not connected properly, no sound will be heard.

2. Volume Settings: The monitor’s volume settings may be too low or muted. Adjusting the volume settings through the monitor’s menu could resolve the issue.

3. Input Source: The monitor uses a 15-pin D-Sub (VGA) connector, which does not carry audio signals. If the audio source is connected only through VGA without a separate audio cable, no sound will be produced.

4. Audio Connection: If the monitor has an audio input port, ensure that an appropriate cable is connected from the audio source (e.g., computer or media device) to the monitor’s input.

5. Hardware Malfunction: A faulty audio board or internal speaker issue could prevent sound output.

6. Software or Driver Issues: If the monitor is connected to a PC, the audio settings in the operating system should be checked to ensure the correct output device is selected.

By checking these factors, the issue with no sound can be identified and resolved.

This answer is automatically generated

0

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Summary of Contents for AOC L19WH

  • Page 1: Table Of Contents

    19" LCD Color Monitor No Brand L19WH Service Service Service Horizontal Frequency 30 kHz-80 kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……......…..1 6.1 Main Board..………........16 Revision List.…........……..2 6.2 Power Board.….……........21 1. Monitor Specification......………..3 6.3 Key Board………………….……………………23 2. LCD Monitor Description…………………………..4 6.4 Audio Board………………….……………………24...

  • Page 2: Revision List

    19" LCD Color Monitor No Brand L19WH Revision List Version Release Date Revision History TPV Model Name Sep-13-06 Initial release T96HM5HBWJDXAP Nov-07-06 Add new BOM T96AM5HBWJDXAP Mar-24-08 Add new BOM T96AMWHBWJDXBP...

  • Page 3: Monitor Specification

    19" LCD Color Monitor No Brand L19WH 1. Monitor Specification Driving system TFT Color LCD LCD Panel Size 48cm(19.0") Pixel pitch 0.2835mm( H ) × 0.2835mm( V ) Video R,G,B Analog Interface Separate Sync. H/V TTL Input H-Frequency 30kHz – 80kHz...

  • Page 4: Lcd Monitor Description

    19" LCD Color Monitor No Brand L19WH 2. LCD Monitor Description The LCD Monitor will contain main board, power board, key board and an audio board which house the flat panel control logic, brightness control logic and DDC. The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.

  • Page 5: Operation Instruction

    19" LCD Color Monitor No Brand L19WH 3. Operation Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The other control buttons are located at front of the panel. By changing these settings, the picture can be adjusted to your personal performance.
  • Page 6 19" LCD Color Monitor No Brand L19WH FRONT PANEL CONTROL • Power Button / Power Indicator: Press this button to turn the monitor ON or OFF. Blue — Power On mode. Orange — Off mode. • MENU / ENTER : Activate OSD menu when OSD is OFF or activate/de-activate adjustment function when OSD is ON or Exit OSD menu when in Volume Adjust OSD status.

  • Page 7: Adjust The Picture

    19" LCD Color Monitor No Brand L19WH 3.3 Adjust the Picture Press the MENU-button to activate the OSD window. Press < or > to navigate through the functions. Once the desired function is highlighted, press the MENU- button to activate it. If the function selected has a sub-menu, press < or > again to navigate through the sub-menu functions.
  • Page 8 19" LCD Color Monitor No Brand L19WH User / Green Green Gain Digital-register. User / Blue Blue Gain from Digital-register. Main Menu Main Menu Icon Menu Sub Menu Icon Description Item Item Auto Adjust the H/V Position, Focus and Clock of picture.

  • Page 9: Input/Output Specification

    19" LCD Color Monitor No Brand L19WH 4. Input/Output Specification 4.1 Input Signal Connector Signal Signal Green Detect Cable Blue Ground Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B -Ground VGA connector layout PIN 1 PIN 5 PIN 11 4.2 Factory Preset Display Modes...

  • Page 10: Panel Specification

    19" LCD Color Monitor No Brand L19WH 4.3. Panel Specification HSD190MGW1- A00 4.3.1 General Feature...
  • Page 11 19" LCD Color Monitor No Brand L19WH 4.3.2 Optical Characteristics Test Conditions Optical Specification...

  • Page 12: Block Diagram

    19" LCD Color Monitor No Brand L19WH 5. Block Diagram 5.1 Software Flow Chart...
  • Page 13 19" LCD Color Monitor No Brand L19WH REMARK: 1) MCU initialize. 2) Is the EEprom blank? 3) Program the EEprom by default values. 4) Get the PWM value of brightness from EEprom. 5) Is the power key pressed? 6) Clear all global flags.

  • Page 14: Electrical Block Diagram

    19" LCD Color Monitor No Brand L19WH 5.2 Electrical Block Diagram 5.2.1 Scalar Board DSUB CN405 CN404 to Audio Board RGB, H/V SYN SCALAR –TSUM56AK-1 A/D input control U401 SCL, SDA, WP CN403 to Keyboard DDC-DSUB port Brightness control Analog-EDID...
  • Page 15 19" LCD Color Monitor No Brand L19WH 5.2.2 Inverter / Power Board AC inlet Filter Rectifier and Rectifier and 12V/5V Transform filter filter D908, D909 To main board Start circuit R904, R931, R938 OVP/OCP circuit Switching circuit Feedback PWM control circuit IC902, IC&MOSFET...

  • Page 16: Schematic

    19" LCD Color Monitor No Brand L19WH 6. Schematic 6.1 Main Board TSUM16AWK SCHEMATIC XGA/SXGA LVDS OUTPUT GNDR GNDR GNDG GNDG GNDB GNDB HSY NC HSY NC VCC1.8 VCC3.3 +12V VSY NC VSY NC DDCA_SDA DDCA_SDA DDCA_SCL DDCA_SCL DET_VGA DET_VGA...
  • Page 17 19" LCD Color Monitor No Brand L19WH SOT-223 U701 VCTRL +3V3 NC/LT1117-18 R702 +3V3 　 1/16W C701 C703 C704 VCC1.8 22uF/50V C702 VCC1.8 22uF/50V D701 Q702 SMAL140 R703 PZT2907A BL_ADJ(DC) 　 1/16W 0V ~ 3.3V 4.7K D702 0V ~ 5V 4.7K...
  • Page 18 19" LCD Color Monitor No Brand L19WH CN405 R491 PC5V 　 1/16W FB410 　 1/16W DB15 RED+ R434 　 1/16W C432 0.047uF RED- GREEN+ FB411 　 1/16W R435 　 1/16W C433 0.047uF GREEN- BLUE+ FB412 　 1/16W R436 　 1/16W C434 0.047uF...
  • Page 19 19" LCD Color Monitor No Brand L19WH VDVI VMPLL VPLL AVDD VDDP VDDC VCC1.8 FB401 VDDC VCC3.3 FB402 AVDD VCC1.8 600 OHM VCC3.3 600 OHM C403 C407 VCC3.3 22uF/50V 0.1uF VCTRL VCTRL C404 C405 C406 0.1uF 0.1uF 0.1uF NC/LVACKP/NC R490...
  • Page 20 19" LCD Color Monitor No Brand L19WH PB[0..5] PB[0..5] CN102 CN103 PA[0..7] RB1P PA[0..7] PA[0..7] RB1N PA[0..7] LVACKP RB2P RA3N FB0N RB3N RA1P LVACKM RB2N RA3P FB0P RB3P RA1N LVA2P RB3P RA2P LVA2M RB3N RA2N FB1N RB2N RA2N LVA1P RA2P...

  • Page 21: Power Board

    F901 　 0805 KIA431A-AT/P C913 FUSE R922 R924 　 0805 2.4K 　 0805 1% CN901 AOC (Top Victory) Electronics Co., Ltd. SOCKET Title 1.POWER OUTPUT 12V & 5 V Size Document Number G1899-1-HP-X-1-060720 Date: Friday , July 21, 2006 Sheet...
  • Page 22 C831 C827 BAV99 R824 BAV99 0.0033uF/16V 470pF/50V D805 BAV99 Q805 750Ω 1/8W AM9945 AOC (Top Victory) Electronics Co., Ltd. Title HP W19 series 17" 19'' 4 LAMPS INVERTER R830 R831 82KΩ 1/8W 7.5K 0805 　 Size Document Number G1899-1-HP-X-1-060720 Date:...

  • Page 23: Key Board

    KEY_LEFT POWER_ KEY LED_GRN LED_ORANGE SPKR_R+ SPKR_L+ SW001 SW002 SW003 SW004 SW005 DP101 CONN ESD by jc chen GREEN ORANGE 2006/5/11 GND wire AOC (Top Victory) Electronics Co., Ltd. Title Size Document Number 715G2127-1 Date: Tuesday, June 13, 2006 Sheet...

  • Page 24: Audio Board

    19" LCD Color Monitor No Brand L19WH 6.4 Audio Board OUT_L +12V CN202 MUTE CN204 VOLUME C203 +12V C201 C202 0.1uF 470uF/16V 470uF/16V OUT_R C214 CONN CONN U201 E-TDA7496L CN201 C204 C205 0.47uF/100V 470uF/16V R201 18K　 OUTL OUTR C206 R203 18K　...

  • Page 25: Pcb Layout

    19" LCD Color Monitor No Brand L19WH 7. PCB Layout 7.1 Main Board...
  • Page 26 19" LCD Color Monitor No Brand L19WH...

  • Page 27: Power Board

    19" LCD Color Monitor No Brand L19WH 7.2 Power Board...
  • Page 28 19" LCD Color Monitor No Brand L19WH...

  • Page 29: Key Board

    19" LCD Color Monitor No Brand L19WH 7.3 Key Board...

  • Page 30: Audio Board

    19" LCD Color Monitor No Brand L19WH 7.4 Audio Board...

  • Page 31: Maintainability

    19" LCD Color Monitor No Brand L19WH 8. Maintainability 8.1 Equipments and Tools Requirement 1. Multi-meter. 2. Oscilloscope. 3. Pattern Generator. 4. DDC Tool with an IBM Compatible Computer. 5. Alignment Tool. 6. LCD Color Analyzer. 7. Service Manual. 8. User Manual.
  • Page 32 19" LCD Color Monitor No Brand L19WH No Picture (LED orange) No picture The button if under X401 oscillate Replace X401 control waveform is normal Check Correspondent Check reset circuit of component U401 is normal Measure U702 Vout=3.3V Q702 Vc=1.8V...
  • Page 33 19" LCD Color Monitor No Brand L19WH White Screen White screen Checks Q704, Q706, Measure C725 (+) =5V Q708 are broken Replace Q704, Q706, Q708 Check CN101 connector or Check X401 Replace X401 solder normal? Replace CN101 or re-solder Replace U401...
  • Page 34 19" LCD Color Monitor No Brand L19WH 8.2.2 Power Board 1. No Power No power Check to CN902 Pin1, 2 =12V and Pin3, 4 = 5 V Check Interface board Check AC line volt 120V or 220V Change F901, Check BD901, Q903, IC901...
  • Page 35 19" LCD Color Monitor No Brand L19WH 2. W/LED No Backlight Check C811 (+) =12V Check adapter circuit Check ON/OFF signal Check Interface board Check IC801 PIN2=5V Check Q801,Q802,Q803 Check the Pin1, Pin15 of IC801 have square wave Check IC801...
  • Page 36 19" LCD Color Monitor No Brand L19WH 8.2.3 Key Board OSD is unstable or not working Is Keypad board connecting normally? Connect Keypad Board Is Button Switch normally? Replace Button Switch Replace Keypad Board Is Keypad board normally? Check main board...

  • Page 37: White-Balance, Luminance Adjustment

    19" LCD Color Monitor No Brand L19WH 9. White- Balance, Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment. 1. How to do the Chroma-7120 MEM. Channel setting A. Reference to chroma 7120 user guide B.
  • Page 38 19" LCD Color Monitor No Brand L19WH C. Adjust SRGB color-temperature 1. Switch the chroma-7120 to RGB-Mode (with press “MODE” button) 2. Switch the MEM.channel to Channel 9(with up or down arrow on chroma 7120) 3. The LCD-indicator on chroma 7120 will show x = 313 ±20, y = 329 ±20, Y = 180 cd/m 4.

  • Page 39: Monitor Exploded View

    19" LCD Color Monitor No Brand L19WH 10. Monitor Exploded View...

  • Page 40: Bom List

    19" LCD Color Monitor No Brand L19WH 11. BOM List T96HM5HBWJDXAP Location Part No. Description 040G 581 26704 SHIPPING LABEL 041G 68508 A CONTROL CARD 044G6002608 9A PAPER BOARD 044G9003220 CORNER PAPER 045G 77 3 PE PACKING 052G 1150 C...
  • Page 41 19" LCD Color Monitor No Brand L19WH A15G0032 6 MAIN FRAME HS A33G0030 GM 1L 32 CABLE COVER A34G0051 GM 3B REAR COVER AUPC6QA1 AUDIO BOARD 040G 457624 1B LABEL-CPU CN202 033G802414C H 2*7PIN DUAL ROW RIGHT ANGLE H 055G 23524...
  • Page 42 19" LCD Color Monitor No Brand L19WH 055G 100611 TIN STICK W/O PB 055G 100613 TIN THREAD C418 067G215V100 7N KY50VB10-M-CC3 5*11.5MM C717 067G215V100 7N KY50VB10-M-CC3 5*11.5MM C710 067G215V101 4N KY25VB100M-CC3(6.3*11) C712 067G215V101 4N KY25VB100M-CC3(6.3*11) C707 067G215V470 4N KY25VB47-M-CC3.0 5*11MM...
  • Page 43 19" LCD Color Monitor No Brand L19WH R420 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R427 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R428 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R429 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R441...
  • Page 44 19" LCD Color Monitor No Brand L19WH R489 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W R739 061G0603153 RST CHIPR 15KOHM +-5% 1/10W R703 061G0603202 RST CHIPR 2 KOHM +-5% 1/10W R417 061G0603203 RST CHIPR 20 KOHM +-5% 1/10W R449 061G0603222 RST CHIPR 2.2 KOHM +-5% 1/10W...
  • Page 45 19" LCD Color Monitor No Brand L19WH C721 065G0603104 32 CHIP 0.1UF 50V X7R C714 065G0603104 32 CHIP 0.1UF 50V X7R C713 065G0603104 32 CHIP 0.1UF 50V X7R C711 065G0603104 32 CHIP 0.1UF 50V X7R C709 065G0603104 32 CHIP 0.1UF 50V X7R...
  • Page 46 19" LCD Color Monitor No Brand L19WH L703 071G 56K121 CHIP BEAD FB407 071G 56K121 M CHIP BEAD L702 071G 56K121 M CHIP BEAD L701 071G 56K121 M CHIP BEAD FB408 071G 56Z601 CHIP BEAD 600 OHM 0805 FB406 071G 56Z601...
  • Page 47 19" LCD Color Monitor No Brand L19WH CN002 088G 30211K PHONE JACK 5PIN GND1 095G 900633 WIRE HARNESS R102 061G0805750 RST CHIPR 75 OHM +-5% 1/8W R101 061G0805750 RST CHIPR 75 OHM +-5% 1/8W C102 065G0603271 31 CHIP 270PF 50V NPO...
  • Page 48 19" LCD Color Monitor No Brand L19WH C815 067G215D4714KV E.C 105℃ CAP 470UF M 25V ED SERIES C904 067G215D4714KV E.C 105℃ CAP 470UF M 25V ED SERIES C911 067G215D4714KV E.C 105℃ CAP 470UF M 25V ED SERIES C912 067G215D4714KV E.C 105℃ CAP 470UF M 25V ED SERIES...
  • Page 49 19" LCD Color Monitor No Brand L19WH Q810 057G 759 2 RK7002 Q809 057G 759 2 RK7002 Q808 057G 759 2 RK7002 Q807 057G 759 2 RK7002 Q804 057G 759 2 RK7002 Q806 057G 763 6 AO4828L Q805 057G 763 6...
  • Page 50 19" LCD Color Monitor No Brand L19WH R850 061G0805472 RST CHIPR 4.7 KOHM +-5% 1/8W R852 061G0805472 RST CHIPR 4.7 KOHM +-5% 1/8W R853 061G0805472 RST CHIPR 4.7 KOHM +-5% 1/8W R811 061G0805473 RST CHIPR 47K OHM +-5% 1/8W R825...
  • Page 51 19" LCD Color Monitor No Brand L19WH R935 061G1206470 RST CHIPR 47 OHM +-5% 1/4W R805 061G1206471 RST CHIPR 470 OHM +-5% 1/4W R919 061G1206471 RST CHIPR 470 OHM +-5% 1/4W R851 061G1206472 RST CHIPR 4.7K OHM +-5% 1/4W R837 061G1206519 RST CHIPR 5.1 OHM +-5% 1/4W...
  • Page 52 19" LCD Color Monitor No Brand L19WH C823 065G1206332 72 GP CHIP 1206 3300PF K 500V X7R C822 065G1206332 72 GP CHIP 1206 3300PF K 500V X7R C813 065G1206332 72 GP CHIP 1206 3300PF K 500V X7R C812 065G1206332 72 GP...
  • Page 53 19" LCD Color Monitor No Brand L19WH FB901 071G 55 29 FERRITE BEAD D901 093G 6026W52T FR107 D902 093G 6038T52T FR103 715G1899 1 HP POWER BOARD PCB L902 S73G17465VW LINE FILTER ASS'Y L903 S73G25391V CHOKE COIL ASS'Y L904 S73G25391V CHOKE COIL ASS'Y...

  • Page 54: Different Parts List

    19" LCD Color Monitor No Brand L19WH 12. Different Parts List Diversity of T96AM5HBWJDXAP compared with T96HM5HBWJDXAP Location Part No. Description 026G 800504 6 BARCODE LABEL E750L 750GLU90W1012N PANEL M190PW01 V00 SZ AUO A15G0032 4 MAINFRAME AUPC6QA5 AUDIO BOARD CBPC6AM5A8QP...
  • Page 55 19" LCD Color Monitor No Brand L19WH R494 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W R491 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W R480 061G0603150 1F RST CHIPR 1.5 KOHM +-1% 1/10W R741 061G0805222 RST CHIPR 2.2KOHM +-5% 1/8W C421...

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