LG 50PC1RR Service Manual page 27

8. Time shift sound and Recorded video sound ( DVR BOARD )
(1) Symptom
1) SOUND doesn't come out.
(2) Check following
MUTE key on?
No
Sound cable is OK?
No
Connect speak cable
Sound is ok?
No
All manuals and user guides at all-guides.com
Yes
Turn off the mute key.
Yes
Are power cables
connected well.
No
Connect power cables
/power B/D.
Yes
Is 31pin cable ok?
Yes
Check speakers
Are they ok?
Yes
Check U13, U14, U1, U7
Check MSP(IC406),
IC404 Is it ok?
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No
Connect 31p cable.
No
Change the speakers.
No
Change the ICs
Is it ok?
Yes
Change B/D.
No