Table of Contents
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22" 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 Instructions..............................................6
3.1 General Instructions...........................................6
3.2 Control Buttons......................................................6
3.3 Adjusting the Picture.................................................7
4. Input/Output Specification.......................................10
N
4.1 Input Signal Connector...........................................10
4.2 Factory Preset Display Modes..................................11
4.3 Panel Specification...............................................12
5. Block Diagram........................................................17
5.1 Software Flow Chart.........................................17
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
5.2 Electrical Block Diagram...................................19
6. Schematic.............................................................21
6.1 Main Board..........................................................21
6.2 Power Board.......................................................25
6.3 Key Board.........................................................27
7. PCB Layout..........................................................28
7.1 Main Board.........................................................28
7.2 Power Board.......................................................30
7.3 Key Board...........................................................33
8. Maintainability........................................................34
8.1 Equipments and Tools Requirement....................34
8.2 Trouble Shooting................................................35
9. Monitor Exploded View.......................................41
10. BOM List..............................................................42
SAFETY NOTICE
1
Topview A2281Wd+
Horizontal Frequency
31kHz - 80kHz
Page
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Summary of Contents for Topview A2281Wd+
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Page 1: Table Of Contents
22” LCD Color Monitor Topview A2281Wd+ Service Service Service Horizontal Frequency 31kHz – 80kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……..……......…..1 5.2 Electrical Block Diagram….…...………..…..…...19 Revision List.….....…….......……..2 6. Schematic…………..........…21 Important Safety Notice.………….......……..3 6.1 Main Board.……...……..........21 1. Monitor Specification.........………..4 6.2 Power Board..………..……........25... -
Page 2: Revision List
22” LCD Color Monitor Topview A2281Wd+ Revision List Revision Date Revision History TPV Model Apr.-3-09 Initial Release TCRSMANAWLTVHN... -
Page 3: Important Safety Notice
22” LCD Color Monitor Topview A2281Wd+ 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. -
Page 4: Monitor Specification
22” LCD Color Monitor Topview A2281Wd+ 1. Monitor Specifications Driving system 22” W TFT Color LCD LCD Panel Size 55.8cm(22") Pixel pitch 0.282mm( H )x 0.282mm( V ) R,G,B Analog Interface Video Digital Input H-Frequency 31KHz – 80KHz V-Frequency 56-75Hz Display Colors 16.7M Colors... -
Page 5: Lcd Monitor Description
22” LCD Color Monitor Topview A2281Wd+ 2. LCD Monitor Description The LCD monitor will contain a main board, a power board and a key 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 6: Operation Instructions
22” LCD Color Monitor Topview A2281Wd+ 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
22” LCD Color Monitor Topview A2281Wd+ • +/Aspect control: The shortcut for switching between Full and 4:3; used as a function key when the OSD directory is in the start status. • Auto Adjust button / Exit: 1. When OSD menu is in active status, this button will act as EXIT-KEY (EXIT OSD menu). - Page 8 22” LCD Color Monitor Topview A2281Wd+ Main Main Menu Sub Menu Menu Sub Menu Item Description Item Icon Icon Brightness Backlight Adjustment Contrast Contrast from Digital-register. Standard Standard Mode Text Text Mode Internet Internet Mode Game Game Mode Luminance Movie...
- Page 9 22” LCD Color Monitor Topview A2281Wd+ Main Main Menu Sub Menu Menu Sub Menu Item Description Item Icon Icon Frame Size Adjust Frame Size Brightness Adjust Frame Brightness Contrast Adjust Frame Contrast Picture Boost Adjust Frame Hue Saturation Adjust Frame Saturation...
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Page 10: Input/Output Specification
22” LCD Color Monitor Topview A2281Wd+ 4. Input/Output Specification 4.1 Input Signal Connector Pin No. Description Pin No. Description Red Video Green Video Logic Ground Blue Video Monitor Ground Monitor Ground DDC-Serial Data DDC-Return H-Sync Red Ground V-Sync Green Ground... -
Page 11: Factory Preset Display Modes
22” LCD Color Monitor Topview A2281Wd+ 4.2 Factory Preset Display Modes Horizontal Vertical Standard Resolution Frequency(KHz) Frequency(Hz) 640x480 31.469kHz 60 Hz 640x480 37.861kHz 72 Hz 640x480 37.500kHz 75 Hz 800x600 35.156kHz 56 Hz 800x600 37.879kHz 60 Hz SVGA 800x600 48.077kHz... -
Page 12: Panel Specification
22” LCD Color Monitor Topview A2281Wd+ 4.3 Panel Specification LTM220M1-L01 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT (Thin Film Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back light unit. - Page 13 22” LCD Color Monitor Topview A2281Wd+ 4.3.2 Optical Characteristics Optical Specifications...
- Page 14 22” LCD Color Monitor Topview A2281Wd+...
- Page 15 22” LCD Color Monitor Topview A2281Wd+ 4.3.3 Electrical Characteristics TFT LCD Module:...
- Page 16 22” LCD Color Monitor Topview A2281Wd+ Back Light Unit:...
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Page 17: Block Diagram
22” LCD Color Monitor Topview A2281Wd+ 5. Block Diagram 5.1 Software Flow Chart... - Page 18 22” LCD Color Monitor Topview A2281Wd+ Remark: 1) MCU initialize. 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 19: Electrical Block Diagram
22” LCD Color Monitor Topview A2281Wd+ 5.2 Electrical Block Diagram 5.2.1 Main Board Panel Interface Crystal 14.318MHZ (CN301) (X401) FLASH ROM Scalar TSUMU58EHL Key Control SST25LF020A (Include ADC, OSD, MCU) Interface (U402) (U401) (CN402) EEPROM D-Sub Connector DVI Connector M24C04... - Page 20 22” LCD Color Monitor Topview A2281Wd+ 5.2.2 Power Board AC input Main Output 100V~240V Transformer VEMI filter Rectifier Board/Inverter Rectifier Circuit Power Switching PWM Control IC Sense Resistor Sampling Photo Couple Resonance NET Transformer High Voltage Output Switching MOS 16V DC...
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Page 21: Schematic
22” LCD Color Monitor Topview A2281Wd+ 6. Schematic 6.1 Main Board 715G2883 1 6 FB102 MVCC_1 VGA_B+ R105 100R 1/16W 5% C102 DSUB_B+ BEAD 0.047uF H_Sy nc R102 0R05 1/10W 5% R103 1K 1/16W 5% R108 C105 DSUB_H V_Sy nc... - Page 22 22” LCD Color Monitor Topview A2281Wd+ CN301 PA[0..9] PB[0..9] PA[0..9] PB[0..9] LVB3P LVB0M RXO0- CN303 LVA3P LVB3M LVB0P RXO0+ LVA3M LVBCKP LVB1M RXO1- LVB0M RXO0- RXO0+ LVB0P LVACKP LVBCKM LVB1P RXO1+ LVACKM LVB2P LVB1M RXO1- RXO1+ LVB1P LVB2M RXO2- LVA2P...
- Page 23 22” LCD Color Monitor Topview A2281Wd+ CMVCC1 VCC1.8 C710 0.1uF 16V FB702 300 OHM CN701 VCC3.3 C705 C704 SM340A D701 MVCC 0.1uF/16V 100UF25V CMVCC Q702 CMVCC KN2907AS R705 BKLT-VBRI R709 BKLT-EN R710 NC 10K 1/16W 5% PANEL_ID# PANEL_ID# 2 Volume#...
- Page 24 22” LCD Color Monitor Topview A2281Wd+ VCC1.8 VDDC VDDP FB403 VCC3.3 FB401 AVDD VCC3.3 FB402 VPLL VCC3.3 VCC1.8 0 OHM +-5% 1/8W C412 300OHM 300OHM VCC3.3 C409 C408 C403 C404 C406 C402 C410 C411 0.1uF/16V C407 0.1uF/16V 10UF50V 0.1uF/16V C405 0.1uF/16V...
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Page 25: Power Board
22” LCD Color Monitor Topview A2281Wd+ 6.2 Power Board 715G2824 2 L904 100 OHM 1/4W R918 FB904 +16V 100 OHM 1/4W R919 C912 BEAD BD901B 0.001uF R946 ZD902 GBU408 100 OHM 1/4W R920 150OHM2W RLZ18B C917 C918 680uF25V 680uF25V FB902... - Page 26 22” LCD Color Monitor Topview A2281Wd+ +16V R805 100R 1/10W 5% ON/OFF D801 LL4148 Q805 CN801 PT801 POWER X'FMR C819 R806 100R 1/8W 68pF/3KV ZD802 RLZ5.6B C816 27PF6KV ZD803 D802 LL4148 CN802 RLZ5.6B R803 R804 5K1 1/8W AM4502C-T1-PF C820 C824...
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Page 27: Key Board
22” LCD Color Monitor Topview A2281Wd+ 6.3 Key Board 715G2836 1 LED_Y EL# LED_BLUE# D001 J002 CN001 0R05 1/4W LBADC1 R002 2K 1/10W 5% LBADC2 DC_POWERON R003 0R05 1/10W LED_BLUE# LED_Y EL# C001 C002 C003 C004 C005 R004 2K 1/10W 5% 150PF NC/0.001uF... -
Page 28: Pcb Layout
22” LCD Color Monitor Topview A2281Wd+ 7. PCB Layout 7.1 Main Board 715G2883 1 6... - Page 29 22” LCD Color Monitor Topview A2281Wd+...
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Page 30: Power Board
22” LCD Color Monitor Topview A2281Wd+ 7.2 Power Board 715G2824 2... - Page 31 22” LCD Color Monitor Topview A2281Wd+...
- Page 32 22” LCD Color Monitor Topview A2281Wd+...
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Page 33: Key Board
22” LCD Color Monitor Topview A2281Wd+ 7.3 Key Board 715G2836 1... -
Page 34: Maintainability
22” LCD Color Monitor Topview A2281Wd+ 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. -
Page 35: Trouble Shooting
22” LCD Color Monitor Topview A2281Wd+ 8.2 Trouble Shooting 8.2.1 Main Board No Power No power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100V-240V is normal Reinsert or check the power section Check C704(+) =1.8V... - Page 36 22” LCD Color Monitor Topview A2281Wd+ 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 Check C704(+) =1.8V U701Vout =3.3V Replace U401...
- Page 37 22” LCD Color Monitor Topview A2281Wd+ White Screen White screen X401 oscillate Measure Q302 base waveform is normal is low level? Replace X401 Check CN301 is solder Check reset circuit of and U301 is OK U401 is normal Check Correspondent Check Correspondent component.
- Page 38 22” LCD Color Monitor Topview A2281Wd+ 8.2.2 Power Board No Power 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 pin3 of IC901...
- Page 39 22” LCD Color Monitor Topview A2281Wd+ W / LED, No Backlight Check C802(+) =16V Check adapter or main board Check ON/OFF signal Check main board Check IC801 PIN2=5V Change ON/OFF circuit Check IC801 PIN13 have triangle wave Change IC801 Check IC801 PIN1/PIN15 PWM wave...
- Page 40 22” LCD Color Monitor Topview A2281Wd+ 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 41: Monitor Exploded View
22” LCD Color Monitor Topview A2281Wd+ 9. Monitor Exploded View... -
Page 42: Bom List
22” LCD Color Monitor Topview A2281Wd+ 10. BOM List TCRSMANAWLTVHN Location Part No. Description Remark 050G 600 2 HANDLE1 050G 600 3 HANDLE2 052G 1150 C INSULATING TAPE 052G 1185 MIDDLE TAPE 052G 1186 SMALL TAPE 052G 1207 A CONDUCTIVE TAPE 45MM *25MM *0.08MM... - Page 43 22” LCD Color Monitor Topview A2281Wd+ CN701 033G3802 9 WAFER 9P RIGHT ANELE PITCH CN301 033G801930F CH JS CONNECTOR R708 061G152M159 64 1.5 OHM 2W 5% MOF C419 067G 3151007KV ELCAP 10UF M 50V 105℃ KINGNICHI C305 067G 3151014KV EC 105℃ CAP 100UF M 25V...
- Page 44 22” LCD Color Monitor Topview A2281Wd+ R130 061G0402100 RST CHIPR 10 OHM +-5% 1/16W R129 061G0402100 RST CHIPR 10 OHM +-5% 1/16W R128 061G0402100 RST CHIPR 10 OHM +-5% 1/16W R127 061G0402100 RST CHIPR 10 OHM +-5% 1/16W R126 061G0402100...
- Page 45 22” LCD Color Monitor Topview A2281Wd+ R411 061G0402103 RST CHIPR 10 KOHM +-5% 1/16W R426 061G0402103 RST CHIPR 10 KOHM +-5% 1/16W R421 061G0402104 RST CHIPR 100 KOHM +-5% 1/16W R420 061G0402121 RST CHIP 120R 1/16W 5% R419 061G0402220 RST CHIPR 22 OHM +-5% 1/16W...
- Page 46 22” LCD Color Monitor Topview A2281Wd+ C418 065G0402104 15 MLCC 0402 0.1UF K 16V X5R C417 065G0402104 15 MLCC 0402 0.1UF K 16V X5R C415 065G0402104 15 MLCC 0402 0.1UF K 16V X5R C414 065G0402104 15 MLCC 0402 0.1UF K 16V X5R...
- Page 47 22” LCD Color Monitor Topview A2281Wd+ FB402 071G 56V301 B CHIP BEAD FCM2012VF-301T07 BULLWILL FB401 071G 56V301 B CHIP BEAD FCM2012VF-301T07 BULLWILL FB104 071G 59G301 CHIP BEAD 300OHM FB105 071G 59G301 CHIP BEAD 300OHM FB107 071G 59G301 CHIP BEAD 300OHM...
- Page 48 22” LCD Color Monitor Topview A2281Wd+ C005 065G0603151 32 CHIP 150PF 50V X7R C003 065G0603151 32 CHIP 150PF 50V X7R C004 065G0603151 32 CHIP 150PF 50V X7R C001 065G0603151 32 CHIP 150PF 50V X7R 715G2836 1 KEY BOARD PCB 709G2836 QS001...
- Page 49 22” LCD Color Monitor Topview A2281Wd+ PT801 080GL19T 32 H X'FMR INVERTER PT801 080GL19T 32 DN X'FMR 785MH TK.2027R.101 CN901 087G 50132A DL AC SOCKET 3PIN BD901 093G 50460900 BRIDGE 4A/800V GBU408 LITEON D907 093G3006 1 1 31DQ06FC3 NIHON INTER...
- Page 50 22” LCD Color Monitor Topview A2281Wd+ R816 061G0603100 2F RST CHIPR 10K OHM +-1% 1/10W R807 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R805 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R813 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W R842...
- Page 51 22” LCD Color Monitor Topview A2281Wd+ J802 061G1206000 RST CHIP MAX 0R05 1/4W RJ801 061G1206000 RST CHIP MAX 0R05 1/4W RJ802 061G1206000 RST CHIP MAX 0R05 1/4W RJ804 061G1206000 RST CHIP MAX 0R05 1/4W FB902 061G1206000 4 RST CHIP MAX 0R05 1/4W...
- Page 52 22” LCD Color Monitor Topview A2281Wd+ C929 065G1206102 72 CAP CHIP 1206 1000PF K 500V X7R C912 065G1206102 72 CAP CHIP 1206 1000PF K 500V X7R D809 093G 64 33 DIO SIG SM BAV99 (PHSE)R D808 093G 64 42 P...
- Page 53 22” LCD Color Monitor Topview A2281Wd+ J816 095G 90 23 JUMPER WIRE J815 095G 90 23 JUMPER WIRE J814 095G 90 23 JUMPER WIRE J811 095G 90 23 JUMPER WIRE J810 095G 90 23 JUMPER WIRE J808 095G 90 23...
- Page 54 22” LCD Color Monitor Topview A2281Wd+ S73L17440VG-Z TRANSFORMER GROUPWARE 034FPU16T01P02 FRAMEWORK UU16P082367 4SLOT PT801 S80GL19T32V TRANSFORMER ASS'Y 071FPE19301 00 MAGNETIC CORE EEL19 PC40 Q34FPE19P05001 EEL-19 COVER Q34FPE19P05P01 FRAMEWORK EEL19 T901 S80GL22T3V XFMR POWER 490UH TPV-PT 071FPC28101 08 MAGNETIC CORE PC40 ER2828 A280...
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