Philips HTS5520 Service Manual page 41

COAX in does not work
COAX in does
not work
Go
Check voltage
PIN5/6/9:5V ） on Main Board whether
normal or not
Yes
Check Main Board U23 CS8416 PIN4
signal input whether right or not
Yes
Check U23 CS8416 whether broken.
Or not
Yes
Replace U23 CS8416
5-10
at XP1 PIN3:12V
No
Refer to Power Board XP701
No
Check Main Board C233, C244, R429,
L16,
No
Check Main Board U8 and CD4053
Trouble shooting Chart