LG 42LB7RF (CHASSIS:LP7AA) Service Manual ▷ View 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?
BLOCK DIAGRAM
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EXPLODED VIEW
300
530
810
813
820
120
510
520
900
850
840
540
550
560
830
400
815
816
812
814
817
811
200
200T
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts
are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as recommended
in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
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