Service manual

!
5:!
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
NOYES 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 VX700-3