Read LG 47LB9R1 (CHASSIS:LP7AB) Service Manual online
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3. In case of no sound
(1) Symptom
1) LED is White
2) Screen existent, but Sound isn’t
(2) Check follow
No
No
No
All input(mode)
is no sound?
Only HDMI is
no sound?
Replace IC400
Replace IC401
Replace
VSC B/D
Set on speaker in menu
Download the EDID data
Check the speaker cable
No
Only RF is
no sound?
Check the Tuner In/Out
No
No
No
Replace IC402
No
Is the Speaker
on in Menu?
Yes
Yes
Yes
Is the speaker
cable normal?
Yes
Yes
Yes
Yes
IC1401 operate
normally?
IC1401 operate
normally?
IC402 operate
normally?
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