Philips HTS5520, Service Manual

Page: 35 / 68

5-4 Trouble shooting Chart
No audio output
No audio output
Go
No
Yes
Yes
Yes
Replace Amplifier Board
No
Replace U22 on Main Board,or
replace Main Board
Yes
Refer to XP701 on
Power Board
No
Check v34V whether normal or not
at XP703 on Amplifier Board
Check the 22pin FFC connection on Main
Board and XP702 on Amplifier Board
whether right or not between Main Board
and Amplifier Board
1. Check the control signal whether right
or not at the U22’16,17,31,on Main
Board and the signal at the
XP11’10,11,15
2. Check the audio signal whether right at
the U11’211,213,214,223,225,226,
Check XP1 pin 7 3.3V on Main Board
whether normal or not