Audio No Signal Output - HP WF1907 Service Manual

4.9 Audio No Signal Output

Check the audio signal input from the audio
source.
OK
Check audio signal input of the I310 TPA6021A4
pin 4, 5, 7, 8.
OK
Check I310 audio power +5V.
OK
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Failure Point
NG
1) No audio signal from the audio source.
2) Audio cable is failure.
Failure Point
NG
1) Printed wire broke between P309 and I310 pin 4, 5,
7, 8.
2) FB318, FB319, R386, R387, C393, C394, C397,
C398 is open.
3) C395, C396, R388, R389 is short.
Failure Point
1) Power board have no output 5V on P301 pin 7, 8.
2) Power board is failure.
NG
3) Printed wire broke between P301 pin 7, 8 and I310
pin 3, 6, 9.
4) FB321 is open.
5) C301~C303, C401~C404 is short.
6) FB320, FB322 is open.
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