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42LB2R (CHASSIS:LP62E) - LG TV Service Manual (repair manual). Page 25

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18. No sound
(1) Symptom
1) LED is white
2) Screen is existent, but sound isn’t output.
(2) Check following
Set on speaker
in menu.
Download the EDID data
Replace IC300.
Check the signal
after IC300 refer to
circuit diagram.
Check the Tuner In/Out.
Yes
No
No
Yes
All input(mode)
is no sound.
Is the speaker
on in menu?
check the
Speaker cable.
No
Yes
Is the speaker
cable normal?
Replace IC400.
Replace IC401.
Replace IC402.
No
Yes
IC400 operate
normally.
No
Yes
IC401 operate
normally.
Replace VSC Board.
No
Yes
IC402 operate
normally.
Yes
No
No
No
No
Only HDMIis no
Sound.
Only
AV input is no
sound.
Yes
Yes
Only RF is no
sound.
Is the output
of IC300(pin52, 53)
normal?
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