Read LG 50PB2RR-TL (CHASSIS:MF-056L) Service Manual online
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8. Time shift sound and Recorded video sound ( DVR BOARD )
(1) Symptom
1) SOUND doesn’t come out.
(2) Check following
MUTE key on?
Sound cable is OK?
Connect speak cable
Sound is ok?
Turn off the mute key.
Are power cables
connected well.
Connect power cables
/power B/D.
Yes
Yes
No
No
No
No
Yes
Yes
Yes
No
Is 31pin cable ok?
Check speakers
Are they ok?
Check U13, U14, U1, U7
Check MSP(IC406),
IC404 Is it ok?
Connect 31p cable.
Change the speakers.
Change the ICs
Is it ok?
Change B/D.
Yes
No
No
No
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