LG 42PC3R Service Manual page 24

6. In case of no sound
(1) Symptom
1) LED is green.
2) Screen display but sound is not output.
(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
Yes
Does IC402
Operates ?
No
Replace IC402
Replace
VSC B/D