ViewSonic VX800-3 Service Manual - Page 47
No Display on Screen LED is green
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4.3 No Display on Screen (LED is green) Is the backlight lit? YES Check that the cable is fully connected to CN500 NO Check that the cable is fully connected between the Inverter and Interface board YES Check IC500 ,IC501 Pin47 (FIG.13) Pin48 (FIG.14) Pin39 (FIG.15) Pin40 (FIG.16) YES Check IC502 Pin 2, 4 is low voltage NO Failure point The cable is disconnected NO Failure point 1. IC500, IC501 failure 2. IC400 failure YES Check IC502 Pin5, 6, 7, 8 is About 5V NO IC502 failure NO IC502 failure NO Failure point The cable is disconnected YES Check CN301 pin1 is12V, pin5 is 5V YES Inverter failure NO IC400 Pin 114 failure ViewSonic Corporation 53! Confidential - Do Not Copy VX800-3
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4.3 No Display on Screen (LED is green)
NO
YES
NO
Is the backlight lit?
Check that the cable is fully
connected to CN500
Check that the cable is fully
connected between the
Inverter and Interface board
Check IC500 ,IC501
Pin47 (FIG.13)
Pin48 (FIG.14)
Pin39 (FIG.15)
Pin40 (FIG.16)
Failure point
The cable is
disconnected
Failure point
The cable is disconnected
Check CN301 pin1 is12V,
pin5 is 5V
Check IC502
Pin 2, 4 is low
voltage
Failure point
1. IC500, IC501 failure
2. IC400 failure
Inverter failure
YES
YES
NO
YES
NO
YES
NO
YES
Check IC502
Pin5, 6, 7, 8 is
About 5V
IC502 failure
NO
IC502 failure
NO
IC400 Pin 114 failure
ViewSonic Corporation
Confidential – Do Not Copy
VX
8
00-3