LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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5. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display appears but there is no sound.
(2) Procedure check
Is there no sound for
All input(modes)?
Is there no sound
only for HDMI?
No
Yes
Download
the EDID data.
Check the signal after
CAX2069 refer to circuit diagram
No
Is there no sound only
for specific input?
(except HDMI,DTV,RF)
Check the signal before
CAX2069 refer to circuit diagram
No
YES
YES
Is there no sound
only for RF?
Check the Tuner
IN/OUT.
No
YES
YES
Is there no sound only
for AV/ component/
PC input?
Is the output of
CXA2069 normal?
No
YES
Is the IC1300
operating normally?
Replace the IC1300.
(MSP4450)
No
Is the IC1301
operating normally?
Replace the IC1300.
(STA335BW)
No
YES
Replace the VSC B/D.
YES
No
Replace the CXA2069
Is the speaker on?
Set on speaker on in
menu.
No
Is the speaker Cable
normal?
Check the Speaker
Cable.
No
Yes
