No audio output
Check the U15 on power supply
(U15:11pin and 14pin=3.3V)
Check whether the audio signal is right
from the U15:’9pin and 10pin
(When you play 1KHz signal disk,the
output is about 2V sine wave)
Add the two Resistances
Yes
No
No audio output
Trouble shooting chart
4-2
Replace the U15
Yes
Check if CN7\CN8 conection
is ok or not pin to pin from the
AV board to mainboard
Fix CN7/CN8 from AV
board to mainboard
Check If the R310,R311 are exsit
No
No
No
Yes
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