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50PB2RRH-TL (CHASSIS:MF-056L) - LG TV Service Manual (repair manual). Page 21

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