Philips HTP3350K/55 Service Manual page 19

Distorted audio and loud noise
Distorted audio and
loud noise
Yes
Check the power supply voltages
+12V to the operation amplifying
Q3 is normal.
Yes
Check whether the
transistor R84,R94, are normal
Yes
Check whether the
transistor Q11,Q12,
normal
Yes
Checking the U6 leads the
feet has no to break to
open
Yes
Check the voltage on
pin3 or pin5 of U6 is OK.
(Should be 2.5~3.1V)
Yes
Check whether the U1 or
U6 powersupply normal
Yes
Replace U1
No
No
muting
No
muting
9are
No
No
No
5-7
Check Q3
Replace R84, R94,
Replace Q11 Q12
Replace R86,R87
Check U6
Trouble shooting chart