LG 42PM1MA Service Manual page 23

6. In case of no sound
(1) Symptom
LED is green
Ø
Screen display but sound is not output
Ø
(2) Check following
Is the SPK cable
normal?
Yes
Is the RF/ AV/
Component/ RGB/
HDMI sound normal?
No
Is the SPK cable
connected well?
No
Cable inserts well.
No
Does IC400
Operates ?
No
Replace IC400
Yes
Replace SPK cable
Yes
Does IC401
Operates ?
No
Replace IC401
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Yes
Does IC402
Operates ?
No
Replace IC402
Replace
VSC B/D