ViewSonic VG800-2 Service Manual page 51

A5. No Sound (Test signal:
YES
Check that ICA1 Pin 3 is
approximately 9V
YES
Check ICA2 pin11
Pin15 signal is
FIG 19.
YES
Check ICA3 pin4,6
is FIG20.
YES
Check ICA5,ICA6 pin4 is
about 5V
YES
ICA5 or ICA6 failure
ViewSonic Corporation
Check that ICA3 Pin 7 is approximately 12V
NO
Check ICA1 pin2
is about 5V
YES
NO
ICM10 failure
1 Vrms sine waveform
Check that ICM20 Pin4 is
Low voltage
YES
Check ICM20
Pin5,6,7,8 is12V
NO
ICM20 failure
NO
Failure point
1.ICA1 failure
2.ICM10 failure
Failure point
1. QA6 or QA7 failure
2. ICA3 failure
48
)
NO
1.JA1 failure
2.ICM10 failure
NO
Confidential – Do Not Copy
NO
Failure point
VG800b