Check the audio signal input from the audio
source.
OK
NG
Failure Point
1) No audio signal from the audio source.
2) Audio cable is failure.
Check audio signal input of the I310 TPA6021A4
pin4,5,7,8.
Failure Point
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.
NG
OK
Check I310 audio power +5V.
Failure Point
1) Power board have no output 5V on P301 pin 7, 8.
2) Power board is failure.
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.
NG
OK
4.9 Audio No Signal Output
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