No Audio Output - Philips HTB5540D/12 Service Manual

No audio output

No audio output
Check voltage +34V for whether normal or
not at on Amplifier Board
Yes
Check the 24Pin FFC connection XP13 on
Main Board and XP1 on Amplifier Board
whether right or not between Main Board
and Amplifier Board
Check the control signal whether right or
not at the U8 Pin6, Pin7 on Main Board
and the signal at the XP13 Pin1,2,3,4,5,7
Yes
Replace Amplifier Board
Go
Yes
5-4
Check XP4 Pin1 +5V on Main Board
No whether normal or not
Refer to CON502 on
Power Board
No
Replace U8 on Main Board or
replace Main Board
Trouble shooting Chart
Yes
No