Read LG 42LH5700 Service Manual online
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5. In case of no sound
(1) Symptom
1) LED
is
blue.
2) Screen display but sound is not output
(2) Check follow
All input(mode)
is no sound?
No
Is VCC “+16.5V or +19.5V”
Normal?(JP1 : 1pin)
Yes
No
Replace Power Board.
Yes
Is the speaker Cable
normal?
normal?
No
Check the Speaker
Cable
Cable
Only HDMI is
no sound?
Download
the EDID data.
No
No
Only DTV is
no sound?
No
Yes
Check the Tuner In/Out
Yes
Only AV/component/PC
input is no sound?
No
Check the input source.
Yes
Replace Main Board.
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