- 24 -
LGE Internal Use Only
Copyright©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
18. No Sound
(1) Symptom
1) LED is green.
2) There is a picture but no sound.
(2) Follow check
Is there sound in any
mode?
Is the speaker
on?
Yes
Yes
Is the speaker
cable normal?
Yes
Yes
Is there no sound
only for HDMI?
Yes
Is there no
sound only AV?
Is the output
of IC300(Pin52,53)
normal?
Yes
Is there no sound
only for RF?
No
No
No
No
Download the EDID data.
Set speaker on
in the menu.
No
Replace the
IC300
No
Check the Speaker
cable
No
Is the IC400
operating normal?
Replace the IC400
No
Yes
Is the IC401
operating normal?
Replace the IC401
Replace the VSC B/D
Yes
Check the signal after IC300.
refer to circuit diagram.
Check the Tuner In/Out.
No
Yes
Is the IC402
operating normal?
Replace the IC402
No
