Philips DVP3111 Service Manual page 13

Distorted audio and loud noise
Check he power supply
voltages +12V
to the operation amplifying
L2 are normal
Check
muting transistors Q12,
Q14, are normal
Checking the U2 leads
the feet has no to break
to open
Distorted audio and
loud noise
Yes
Yes
whether the
Yes
No
Yes
Check whether the U5
or U2 power supply
normal
Yes
Replace U2, U5
5-5
No
Replace L2
No
Replace Q12, Q14
No
Correct connection
No
Check U2, U5
Trouble shooting chart