ViewSonic VG800-2 Service Manual page 50

A4. No Power On
Check that ICM1 PIN8 and
ICM2 Pin 5, 6, 7, 8 is 12V
YES
Check that ICM1 pin5
Is about 5V
YES
Check that LM5
pin 2 is about 5V
NO
Failure point
1.LM5 failure
2.DM1 failure
3.ICM2 failure
ViewSonic Corporation
Check that JM1 Pin1 is approximately 12V
YES NO
Failure point
1. AC adapter failure
2. Disconnected between JM1 and power cord
NO
Failure point
LM1,2 failure
NO
Failure point
ICM1 failure
47
Confidential – Do Not Copy
VG800b