![background image](http://html1.mh-extra.com/html/viewsonic/va912-4/va912-4_service-manual_1020986056.webp)
No Audio
No Audio Output
Check Input
Signal J3 OK?
Check JP2 to
Speaker OK?
Check U9
pin12(Mute),pin11(
Stby)
Check CN1 pin
1,2=12V?
Check U9(pin6)
Volume and Q
15
Change M/B
Check Input source
or Change J3
Change Speaker or
JP2(Cable)
Change power
board module
Change Q15
Change U9
OK
OK
OK
OK
OK
No
No
No
No
No
53
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Corporation
Co
nfidential
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Copy
VA912-4_VA912b-4