Philips DVP3850K/55 Service Manual page 27

Distorted audio and loud noise
Distorted audio and
loud noise
Yes
Check the power supply voltages
M5V to the operation amplifying
Q544 is normal.
Yes
Check whether the muting resistance
R369,R375 are normal
Yes
Check whether
transistor Q361,Q362
normal
Yes
Checking the U361 leads
the feet has no to break to
open
Yes
Check the voltage on pin3
or pin5 of U361 is OK.
(Should be 2.5~3.1V)
Yes
Check whether the U1 or
U361 powersupply normal
Yes
Replace U1 or U361
No
No
the muting
are
No
No
4-7
Check Q544
No
Replace
R369,R375
Replace
Q361,Q362
Correct connection
No
Replace R361,R362
Check U361
Trouble shooting chart