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20" LCD Color Monitor
Service
Service
Service
Description
Table Of Contents..........................................................1
Revision List........................................................2
Important Safety Notice.............................................3
1. Monitor Specification.................................................4
2. LCD Monitor Description........................................5
3. Operation Instruction...............................................6
3.1 General Instructions................................................6
3.2 Control Button.......................................................6
3.3 Adjusting the Picture................................................7
4. Input/Output Specification....................................10
4.1 Input Signal Connector.........................................10
4.2 Factory Preset Display Modes................................11
N
4.3 Panel Specification..............................................12
5. Block Diagram.......................................................14
5.1 Software Flow Chart..........................................14
5.2 Electrical Block Diagram.................................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
R FOR TH
UNIT WHEN S
TABLE OF CONTENTS
Page Description
6.Schematic...............................................................18
6.1 Main Board............................................................18
6.2 Power Board.........................................................22
6.3 Audio Board...................................................24
7.PCB Layout.....................................................25
7.1 Main Board..........................................................25
7.2 Power Board.........................................................28
7.3 Key Board............................................................29
7.4 Audio Board.........................................................30
8. Maintainability......................................................33
8.1 Equipments and Tools Requirement......................33
8.2 Trouble Shooting..................................................33
9. White-Balance, Luminance adjustment....................37
10. Monitor Exploded View.......................................39
11. BOM list.................................................................41
SAFETY NOTICE
1
AOC 203Vwa
Horizontal Frequency
31kHz - 82kHz
Page
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Summary of Contents for AOC 203Vwa
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Page 1: Table Of Contents
20” LCD Color Monitor AOC 203Vwa Service Service Service Horizontal Frequency 31kHz – 82kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……....…....…..1 6.Schematic……………..........…18 6.1 Main Board.…..…...……..........18 Revision List.…........……..2 Important Safety Notice.……..………....……..3 6.2 Power Board..………..……........22 1. Monitor Specification..….......………..4 6.3 Audio Board……………………………………………24 7.PCB Layout..…………........25... -
Page 2: Revision List
20” LCD Color Monitor AOC 203Vwa Revision List Revision Date Revision History TPV Model Oct.-15-07 Initial Release TA7CNADQW3AC6N... -
Page 3: Important Safety Notice
AOC 203Vwa 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 4: Monitor Specification
20” LCD Color Monitor AOC 203Vwa 1. Monitor Specifications... -
Page 5: Lcd Monitor Description
20” LCD Color Monitor AOC 203Vwa 2. LCD Monitor Description The LCD MONITOR will contain a main board, a power board, a key board and an audio board which house the flat panel control logic, brightness control logic and DDC. -
Page 6: Operation Instruction
20” LCD Color Monitor AOC 203Vwa 3. Operating Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the monitor. By changing these settings, the picture can be adjusted to your personal preferences. -
Page 7: Adjusting The Picture
20” LCD Color Monitor AOC 203Vwa 3.3 Adjusting 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-buttonto activate it.If the function selected has a sub-menu, press or again to navigate through the sub-menu functions. Once the desired function is highlighted, press MENU-button to activate it. - Page 8 20” LCD Color Monitor AOC 203Vwa...
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Page 10: Input/Output Specification
20” LCD Color Monitor AOC 203Vwa 4. Input/Output Specification 4.1 Input Signal Connector... -
Page 11: Factory Preset Display Modes
20” LCD Color Monitor AOC 203Vwa 4.2 Factory Preset Display Modes... -
Page 12: Panel Specification
20” LCD Color Monitor AOC 203Vwa 3 Panel Specification 4.3.1 Features CLAA201WA04 is 20.1”(51.11cm) color TFT-LCD (Thin Film Transistor Liquid Crystal Display)module composed of LCD panel, LVDS driver ICs, control circuit and backlight(CCFL, 4 tubes). By applying 8 bit digital data(6bits+Hi-FRC), 1680×1050, drived by 5 voltages,16.7M-color images are is played on the 20.1”... - Page 13 20” LCD Color Monitor AOC 203Vwa 4.3.3 Optical Characteristics The optical characteristics are measured under stable conditions at Ta=25℃，VCC=5.0V...
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Page 14: Block Diagram
20” LCD Color Monitor AOC 203Vwa 5. Block Diagram 5.1 Software Flow Chart... - Page 15 20” LCD Color Monitor AOC 203Vwa 1) MCU initializes. 2) Is the EPROM blank? 3) Program the EPROM by default values. 4) Get the PWM value of brightness from EPROM. 5) Is the power key pressed? 6) Clear all global flags.
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Page 16: Electrical Block Diagram
20” LCD Color Monitor AOC 203Vwa 5.2 Electrical Block Diagram 5.2.1 Main Board LCD Interface (CN402) (U9) Scalar IC TSUMU58WHJ EEPROM (U1) Crystal 14.318MHZ (Include MCU, ADC, OSD) 24LC16B/SNG (X201) (U203) (U204) (U1) H sync Digital V sync Video Signal... - Page 17 20” LCD Color Monitor AOC 203Vwa 5.2.2 Inverter/Power Board AC input Bridge Rectifier Transformer Rectifier diodes EMI filter and Filter CN902 Start Circuit: R905 Feedback Over Voltage Circuit Control IC Protect ON/OFF Output MOSFET Circuit Transformer Lamp Over ON/OFF Feedback...
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Page 18: Schematic
20” LCD Color Monitor AOC 203Vwa 6. Schematic 6.1 Main Board BAV70 DVI_5V D102 FB101 DVI_VDD 120 OHM DVI_5V FB107 +5V_ESD C106 C107 R106 120 OHM 10R 1/16W 0.1uF 16V 1uF 16V RX2M D103 BAV99 BAV99 BAV99 RX2- RX2- RX2P... - Page 19 0R05 1/16W 0.1uF 16V 0.1uF 16V PANEL_PWR MCU_VDD R210 FB204 LED_R +3.3VCC 120 OHM AVCC KEY _PWR 203Vwa MENU KEY R233 NC/750R OHM 1/16W 5% LED_B/G C206 C207 LF_LED 0.1uF 16V 0.1uF 16V 203Vwa LEFT KEY FB205 120 OHM CVDD18...
- Page 20 20” LCD Color Monitor AOC 203Vwa U303 PANEL_VCC C302 R302 R303 330Ω 1/4W 330Ω 1/4W 10uF/16V C303 0.1uF 16V R305 10K 1/16W Q302 U301 R307 AO3401 AP1117D33LA +3.3VCC C304 51K OHM 1/16W R308 4K7 1/16W Q301 PANEL_PWR 2N3904S-RTK/PS 1uF 16V...
- Page 21 TCLK1P CONN CN401 R407 1K 1/16W TCLK2M KEY 1_PAD KEY 1 TCLK2P KEY 2_PAD Auto/Left/Right key POWER C402 R411 LED_G 203Vwa RIGHT KEY LED_O BRIGHTNESS LF_B 0.1uF 16V LIGHT_SEN R410 5V_FB 1K 1/16W OUT-L+ KEY 2 OUT-L- PANEL_VCC EAR-R C403...
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Page 22: Power Board
20” LCD Color Monitor AOC 203Vwa 6.2 Power Board R951 47Ω 1/4W 0.001uF/500V R952 C920 BD901 47Ω 1/4W 2KBP08M D920 3.5uH SP10150 R909 T901 L921 100KΩ 2W +12V C907 C925 R931 10KΩ 1/4W 100UF/450V 470uF/25V R905 C910 10KΩ 1/4W 1500pF/1KV... - Page 23 3MΩ 1/2W R830 15KΩ 1/8W C832 C827 47pF 270pF BAV99 Q806 R835 C838 AM9945N-T1-PF 560Ω 1/8W 0Ω 1/4W AOC (Top Victory) Electronics Co., Ltd. D804 Title D803 C833 2.INVERTER 100pF R834 3.6KΩ 1/8W BAV70 Size Document Number G1823-C-AO-X-1-070312 Date: Monday , March 12, 2007...
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Page 24: Audio Board
20” LCD Color Monitor AOC 203Vwa 6.3 Audio Board OUT_L +12V CN202 MUTE CN204 C201 C202 VOLUME C203 +12V 470uF/25V 470uF/25V 0.1uF C214 OUT_R CONN U201 E-TDA7496L CN201 C205 C204 0.47uF/50V 470uF/16V R201 18KΩ OUTL 0.47uF/50V C206 OUTR R203 18KΩ... -
Page 25: Pcb Layout
20” LCD Color Monitor AOC 203Vwa 7. PCB Layout 7.1 Main Board 715G2186-1... - Page 26 20” LCD Color Monitor AOC 203Vwa...
- Page 27 20” LCD Color Monitor AOC 203Vwa...
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Page 28: Power Board
20” LCD Color Monitor AOC 203Vwa 7.2 Power Board... -
Page 29: Key Board
20” LCD Color Monitor AOC 203Vwa 7.3 Key Board... -
Page 30: Audio Board
20” LCD Color Monitor AOC 203Vwa 7.4 Audio Board... -
Page 31: Maintainability
20” LCD Color Monitor AOC 203Vwa 8. Maintainability 8.1 Equipments And Tools Requirement Voltmeter. Oscilloscope. Pattern Generator. DDC Tool with an IBM Compatible Computer. Alignment Tool. LCD Color Analyzer. Service Manual. User Manual. 8.2 Trouble Shooting 8.2.1 Main Board No power... - Page 32 20” LCD Color Monitor AOC 203Vwa White screen White screen Measure Q301 base X201 oscillate waveform is normal is high level? Replace X201 Check Q301,Q302 are Check reset circuit of broken or CN101 solder? U203 is normal Check Correspondent Check Correspondent component.
- Page 33 20” LCD Color Monitor AOC 203Vwa No picture (LED orange) No picture The button if X201 oscillate Replace X201 under control waveform is normal Check reset circuit of Check Correspondent component U203 is normal Measure U301 PIN2=3.3V U304 PIN2=1.8V Check U203...
- Page 34 20” LCD Color Monitor AOC 203Vwa 8.2.2 Power/Inverter Board No power Check CN902 pin3,4 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C907 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901...
- Page 35 20” LCD Color Monitor AOC 203Vwa W / LED, No Backlight Check R802=12V Check adapter or MB Check ON/OFF signal Check Interface board Check IC801 pin2=5V pin9=12vvoltage of C905(+) change on/off circuit Check IC801 PIN13 have the output of square wave at short time...
- Page 36 20” LCD Color Monitor AOC 203Vwa 8.2.3 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? Replace Key Pad Board Is Key Pad Board normally?
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Page 37: White-Balance, Luminance Adjustment
= 313 ± 25, y = 329 ± 25, Y= 180cd/m 3. Into Factory mode of AOC 203Vwa: Press the MENU button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the left top of the panel. - Page 38 20” LCD Color Monitor AOC 203Vwa 5. Adjust the GREEN of color3 on factory window until chroma 7120 indicator reachedthe value G=100 6. Adjust the BLUE of color3 on factory window until chroma 7120 indicator reached the value B=100 7. Repeat above procedure (item 4,5,6) until chroma 7120 RGB value meet the tolerance =100± 2 C.
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Page 39: Monitor Exploded View
20” LCD Color Monitor AOC 203Vwa 10.Monitor Exploded View... - Page 40 20” LCD Color Monitor AOC 203Vwa Item Description Item Description BEZEL SCREW LED LENS SCREW KEY BUTTON REAR COVER KEY BOARD VESA BKT MAIN FRAME SPEAKER PANEL SCREW SCREW SCREW POWER BOARD STAND FRONT COVER MAIN BOARD HINGE AUDIO BOARD...
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Page 41: Bom List
20” LCD Color Monitor AOC 203Vwa 11. BOM List TA7CNADQW3AC6N Location Part No. Description 007G 5 10 1 COMPOUND PALLET 040G 154501 1 HI-POT GND LABEL 040G 581 26646 EANCODE LABEL 044G3231 15 EVA WASHER 044G6000 4E CARTON 045G 77500... - Page 42 20” LCD Color Monitor AOC 203Vwa A34G0130ABJA2B REAR COVER (20") A33G0091 2 1C LENS A33G0092ABJ 1L KEY PAD A34G0129ABJE1B BEZEL (20") A34G0132ABJ 1B STAND REAR COVER A34G0133ABJ 1B BASE AUPC7QC8 AUDIO BOARD CN203 033G3802 4 WAFER EH-4 CN202 033G8027 10 WAFER 2*5P 2.0MM R/A...
- Page 43 20” LCD Color Monitor AOC 203Vwa CN101 088G 35315F H D-SUB 15PIN CN102 088G 35424F N DVI 24PIN CONN X201 093G 2251B CRYSTAL MXS12.000AC20F-KAB5 HC-49/US U301 056G 563 52 IC AP1117D33LA TO252-3L ATC U304 056G 56327A IC AP1117E18LA SOT223-3L ANACHIP...
- Page 44 20” LCD Color Monitor AOC 203Vwa R122 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R144 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R301 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R311 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R312 061G0402102...
- Page 45 20” LCD Color Monitor AOC 203Vwa R139 061G0402750 RST CHIPR 75 OHM +-5% 1/16W R140 061G0402750 RST CHIPR 75 OHM +-5% 1/16W FB105 061G0805000 0 OHM 1/10W R302 061G1206331 RST CHIPR 330 OHM +-5% 1/4W R303 061G1206331 RST CHIPR 330 OHM +-5% 1/4W...
- Page 46 20” LCD Color Monitor AOC 203Vwa C103 065G0402104 12 CAP CHIP 0402 0.1UF 16V X7R C102 065G0402104 12 CAP CHIP 0402 0.1UF 16V X7R C101 065G0402104 12 CAP CHIP 0402 0.1UF 16V X7R C219 065G0402220 31 CHIP 22PF 50V NPO...
- Page 47 20” LCD Color Monitor AOC 203Vwa D111 093G 6433S DIODE BAV99 SEMTECH D109 093G 6433S DIODE BAV99 SEMTECH D108 093G 6433S DIODE BAV99 SEMTECH D107 093G 6433S DIODE BAV99 SEMTECH D101 093G 6433S DIODE BAV99 SEMTECH D103 093G 6433S DIODE BAV99 SEMTECH...
- Page 48 20” LCD Color Monitor AOC 203Vwa R909 061G152M10458F 100K OHM 5% 2W R916 061G152M438 64 RST MOFR 0.43OHM +-5% 2WS C909 063G 10747410V 0.47UF 275VAC ARCO C816 065G 3J1506ET 15PF 5% CC45SL 3KV TDK C825 065G 3J1506ET 15PF 5% CC45SL 3KV TDK...
- Page 49 20” LCD Color Monitor AOC 203Vwa 0M1G1730 8120 SCREW 705GQV93001 D920 ASS'Y D920 093G 60281 DIODE SP20150R ITO-220 SECOS 0M1G1730 10120 SCREW Q90G0062 1 HEAT SINK IC901 056G 379 61 LD7575PS SOP-8 IC801 056G 608 10 IC OZ9938GN-B SOIC-16 Q803...
- Page 50 20” LCD Color Monitor AOC 203Vwa R924 061G0805360 1F RST CHIPR 3.6KOHM +-1% 1/8W R817 061G0805360 2F RST CHIPR 36 KOHM +-1% 1/8W R826 061G0805430 0F RST CHIPR 430 OHM +-1% 1/8W R825 061G0805561 560 0805 R835 061G0805561 560 0805...
- Page 51 20” LCD Color Monitor AOC 203Vwa C930 065G0805104 32 CHIP 0.1U 50V X7R C929 065G0805104 32 CHIP 0.1U 50V X7R C928 065G0805104 32 CHIP 0.1U 50V X7R C916 065G0805104 32 CHIP 0.1U 50V X7R C912 065G0805104 32 CHIP 0.1U 50V X7R...
- Page 52 Q15G0128 7CKD MAIN FRAME Q15G0129 1 IO BRACKET Q15G0156 1 CABLE PLATE Q40G 20N61523A RATING LABEL Q40G0002615A37 POP LABEL FOR 203VWA Q40G0002983 1A VISTA LABEL Q41G7800615A55 SA SERVICE CENTER FOR 712SA Q41G780A61528A 203VWA QSG Q44G 10 1 BIG CARTON FOR IC...
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