No Audio Output - Philips HTS5530/12/55/78/94 Service Manual

No audio output

No audio output
Check whether the +34V
power is right at the
XP703 on am board
Yes
Check
connection and XS702 is
fixing OK between the main
board and am board
Yes
1. Check whether the control
signal is
U24'16,17,31,and the signal at
the XP11'10,11,15pin
2. Check whether the audio signal
is right
U11'211,213,214,223,225,226,
Yes
Replace the am board
Go
the 22pin FFC
right from the
from the
5-4
Check the
No
connector XP1 pin
7 on main board is
3.3V
Refer to Power
supply board part
No
Replace U22 on main board,or
replace main board
Trouble shooting Chart
No
Yes