Philips DVP3880KX - Audio Distortion and Noise

4-7
Distorted audio and loud noise
No
Yes
No
Yes
Yes
No
No
Distorted audio and
loud noise
Replace
R167，R152
Check Q3
Replace
Q48,Q50,
Check whether the muting transistor
R167，R152 are normal
Yes
Check whether the muting
transistor Q48,Q50, are normal
Checking the U12 leads
the feet has no to break to
open
Correct connection
Replace R76，CE38，C152
Check the voltage on
pin3 or pin5 of U12 is
OK.
(
Should be 2.5~3.1V
)
Check whether the U1 or
U12 powersupply normal
No
Yes
Check the power supply voltages
+12V to the operation amplifying
Q3 is normal.
Yes
Check U12
Replace U20
No
Yes
Trouble shooting chart