Philips DVP2851/55 Service Manual page 21

Distorted audio and loud noise
Distorted audio and
Checkthe
voltages
operation amplifying Q753
is normal.
Check whether the muting
resistance R133 is normal
Check whether the muting
resistance R132 is normal
Checking
leads the feet has no to
break to open
Check the voltage on
pin7 of U927 is OK.
Check whether the U1
or U927 powersupply
normal
Replace U1 or U927
loud noise
Yes
power supply
+5V to the
Yes
Yes
Yes
the U927
Yes
Yes
Yes
4-7
No
Check Q753
No
Replace
R133
No
Replace
No
Correct connection
No
Replace R134
No
Check U927
Trouble shooting chart
R132