ViewSonic Vx2255wmb-2 Service Manual
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6.5 Backlight can’t be turned on 58 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2
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6.6 Black Screen and backlight turn on Black Screen Check VCC 5V Power Fail Check VCC 3.3V a n d VCC 1.8V Check FB103 Check Reset Waveform Check C151 Check Crystal pin(96,97)waveform Check Check CCFL Enable Check pin10 of Invert fail U104 fail Check R147,R111,R112, and Q106 NG OK OK OK OK NG OK OK NG NG NG Check Crystal Waveform Check FB102 NG 59 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2
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6.7 White Screen LVDS cable reinser t NG Change LVDS cable NG Check VLCD Is 5V NG Check panel Enable of Panel Enable OK Check Q101,Q103 and END OK OK OK Check VLCD sin gals Workmanship LVDS cable NG OK Panel Fail Check CN104 White Screen 60 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2
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6.8 Bad Screen
Bad Screen
LV D S
Cable
Reinsert
NG
Change LVDS
Cable
NG
Check Stalcry pin
127 and pin128
OK
CheckU105and
SDO/SCZ/SCKSDI /RSTN
OK
NG
Workmanship
Check X1,C150 and
C152
SDO/SCZ/SCK/SDI
61
ViewSonic Corporation
Confidential - Do Not Copy VX2255wmb-2
VX2255wmh-2
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62 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2 7. Block Diagram EMI Filter Circuit 5V Switch to Panel Power Switch transformer Regulator (5Vto 1.8V ) Inverter Circuit OZ9938G Rectifier/ filter 5V Output Photocoupler Protection feedback EEPROM AT24C04N (VGA) Key & LED Sampling Voltage feedback EEPROM 24C04 Audio Input AC Input VGA Input Key Input Speaker Panel Back lamp Regulator (5V to 3.3V ) Rectifier& Filter Circuit Rectifier/ filter 16V...
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63 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2 8. Schematic Diagrams Model TitleDate Rev:ViewSonic Corporation DC to DC From Power & Inverter From keypad LED_A LED_G Backlight_ON/OFF Backlight_ON/OFF Adjust_Brightness Adjust_Brightness LED_A LED_G VLCD VCC5V VCC1.8 VCC3.3 VCC3.3VCC3.3 VCC3.3 VCC5V VCC5V C107 0.1/16V R104 20K R107 1K C109 0.1/16V U101 AP1084K33LA 3 1 2 VIN ADJVOUT R112 100 C110 1u/16V R101 4K7 R110 4K7 R108 4K7 C105 0.1/16V R109 220 R106 4K7 C103...
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64 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2 Model TitleDate Rev:ViewSonic Corporation Input DETECT R B G G B R DETECT DAT0- DCLK- DAT1+ DCLK+ DAT2- DAT0+ DAT2+ DAT1- SDA_DVI SCL_DVI DAT0- DAT1- DCLK- DAT1+ DAT0+ DAT2+ DDCA_SDA DDCA_SCL DDCA_SCL DCLK+ DAT2- DDCA_SDA SCL_DVI SDA_DVI PC5V_VGA VCC3.3PC5V_VGA VCC3.3 VCC3.3 DVI5V DVI5VVCC3.3 VCC3.3 C114 0.047u/16V CN201 DVI-D_CON 123456789101112131415161718192021222324 RX2- RX2+ GND RX4- RX4+ SCL SDA VS RX1- RX1+...
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65 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2 Model TitleDate Rev:ViewSonic Corporation SCALER 4 5 6 7 8 F_WP I2C_MDA HDCP_WP EEP_W P I2C_MCL SDO SCK 7 SDI 4 SCZ 6 5 I2C_MCLEEP_WP I2C_MDA F_WP 8 HDCP_WP 76 845 VCC3.3 VDDP_33 VDDC_18 VCC1.8 AVDD_18 AVDD_33 VCC3.3 AVDD_33 VCC5V VDDP_33 AVDD_18 VDDC_18 VDDP_33 AVDD_33 VLCD VCC3.3 VCC3.3 R140 4K7 R146 4K7 C139 0.1/16V C161 0.1/16V C158 0.1/16V R154 1K C145 0.1/16V C159 0.1/16V R141 10K R147 4K7 C130 0.1/16V C141...
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66 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2 Model TitleDate Rev:ViewSonic Corporation Power AC 264V RMS L AC 264V RMS AC 264V RMS DC 380V Max. N DC 700V Max. DC 700V Max. TO SCALER BD CN101 AC 264V RMS VCC5V 3+16V3,4 ON/OFF 3BRIGHTNESS 3VOL4MUTE 4 F802 4A/125V C823 2200p/400V + C817 470u/25V R816 100R 1W R824 3K 1% + C807 47u/25V R822 4K7 1% R818 NC / 200 D802 MUR1100ERL C825 0.1/50V R829 15K + C818 1000u/10V IC802 NCP1337 1234 5678 BOFB CS GND DRV Vcc NC...
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67 ViewSonic Corporation Confidential - Do Not Copy VX2255wmb-2 VX2255wmh-2 Model TitleDate Rev:ViewSonic Corporation Audio MIC JACK For VSC 22W, Jumper J701/J702 are NC For Acer 22W, 20 and VSC 20 , CN702/CN703 are NC LEFT_SPEAKER+ Line_R RIGHT_SPEAKER+ Line_L MIC- MIC+ +16V 2,3 MUTE 2VOL 2 +16V +16V +16V Q702 PMBT3904 1 32 U701 TDA8496L 8 1115 5 4 3 2 6 1 7 910 14 13 12 S_GND GND GND INL VAROUT_L VOLUME VAROUT_R NC INR SVR STBY MUTE OUTR VSOUTL R702 10K R714 30K CN703 5P 2.0mm/NC 5 4 3 2...