No Display On Screen (Led Is Green) - ViewSonic VX800-3 - 18" LCD Monitor Service Manual

4.3 No Display on Screen (LED is green)

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