Sound Troubleshooting - Sony PFM-42X1 Service Manual

3-3. Sound Troubleshooting

Replace
the Main board
n
Sound output device (IC351) has over lod protection circuit.
If speaker terminal is shorted in a moment.
Sound function is stopped until the power switch off and on.
PFM-42X1/42X1N
NO SOUND OUTPUT
Check Connector
Main Board:CN12, CN14
Video Board:CN103
Option Board:CN206
Pass
Fail
Check
Audio Input Select
IC41 (CXA2069)
Pass
Sound B,d Check
Pass
Check Connector
Sound Board:CN301
Pin#1,3
Check
Audio Process
IC301(TA1343N)
Pass
Check
Audio Amp.
IC351
(TPA3002D2)
n
Pass
Fail
Replace
the Audio board
Replace
the Audio board
3-7