Service manual

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