LG 42LB5RT - Page 23

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Symptom
LED is Green Screen i s existent, but sound isn’t
Check f ollow
18. No Sound
All input (mode)
is no sound?
Is the speaker
on in menu?
Is the speaker cable normal?
IC400 operate
normally?
Set on speaker
in menu
Check the
Speaker cable
Replace IC400
IC401 operate
normally?
Replace IC401
IC402 operate
normally?
Replace IC402
Replace VSC B/D
Only HDMI is
no Sound?
Download the EDID data
Only AV input is
no Sound?
Is the output
of IC300(pin52,53)
normal?
Check the signal
after IC300
refer to circuit diagram
Replace IC300
Only RF is
no Sound?
Check the Tuner In/Out
YES
YES YES
YES YES YES YES YES
YES
NO
NO NO
NO
NO NO
NO NO NO NO