LG 42PX4R Service Manual page 22

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