Read LG 50PT85-ZB (CHASSIS:PD74A) Service Manual online
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8. Time shift sound and Recorded video sound ( DVR BOARD )
(1) Symptom
1) SOUND does not come out.
(2) Follow check
MUTE key on?
Is the Sound cable
normally?
Connect speak cable
Sound normally?
Turn off the mute key.
Are power cables
connected.
Connect power cables
/power B/D.
Yes
Yes
No
No
No
No
Yes
Yes
Yes
No
Is the 31pin
cable(P1501) normally?
Check the speakers
normally?
Check the MSP(IC1300),
Audio AMP(1301)
normally?
Connect the Data
cable.
Change the speakers.
Change the ICs
normally?
Change the VSC B/D.
Yes
No
No
No
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