Read LG 42PG20D-DA (CHASSIS:PT81A) Service Manual online
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6. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display but sound is not output.
2) Screen display but sound is not output.
(2) Check following
All input(mode) is no
sound?
Only HDMI is No
Sound?
Yes
Download
the EDID data
Yes
No
YES
Only RF is no sound?
Check
the Tuner’s IN/OUTPUT
Yes
No
Is the IC629 normal?
Replace the IC629
(MSP4458)
No
Is the IC601 normal?
Replace the IC601
(NTP-3000A)
No
YES
Replace the VSC Board
YES
Is the speakers turned
on?
Set on the speakers on
menu.
No
Is the speaker Cable
connect?
Connect the Speaker
Cable.
No
Yes
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