ViewSonic VA912-4 Service Manual page 56

No Audio
ViewSonic Corporation
No Audio Output
Check Input
Signal J3 OK?
OK
Check JP2 to
Speaker OK?
OK
Check CN1 pin
1,2=12V?
OK
Check U9(pin6)
Volume and Q
15
OK
Check U9
pin12(Mute),pin11(
Stby)
OK
Change M/B
53
Check Input source
No
or Change J3
Change Speaker or
No
Change power
No
board module
No
Change Q15
No
Change U9
Confidential - Do Not Copy
JP2(Cable)
VA912-4_VA912b-4