Distorted Audio And Loud Noise - Philips DVP3850K/96/98 Service Manual

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 the
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
muting
are
No
No
No
4-7
Check Q544
No
Replace
R369,R375
Replace
Q361,Q362
Replace R362,R363
Check U361
Trouble shooting chart