ViewSonic VG800-2 Service Manual page 49

A3. No Display on Screen ( LED is green)
Is the backlight lit?
YES
Check that the signal cable is
fully connected to JM9,JM10,
JM11
YES
Check ICM15 ,ICM16
Pin47 (FIG.15 )
Pin48 (FIG.16 )
Pin39 (FIG.17 )
Pin40 (FIG.18)
YES
Check ICM17
Pin4is low voltage
YES
Check ICM17
Pin5,6,7,8 is
About 5V
ViewSonic Corporation
NO
Failure point
The cable is
disconnected
NO
Failure point
1.ICM15,ICM16 failure
2.ICM11 failure
NO
ICM10 failure
NO
ICM17 failure
46
NO
Check that the signal cable is
fully connected between the
Inverter and Interface board
The cable is disconnected
YES
Check JM2 pin1 is12V,
pin5 is 5V
YES
Inverter failure
Confidential – Do Not Copy
NO
Failure point
NO
ICM10 failure
VG800b