Read LG 37LG50D (CHASSIS:LE81D) Service Manual online
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4. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display appears but there is no sound.
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 in HDMI?
No
Yes
Download
the EDID data
Check the signal after
CAX2069 refer to circuit diagram
No
Is there no sound only in
Component, RGB mode?
No
YES
YES
Is there no sound
only in RF?
Check the
Tuner IN/OUT
No
YES
YES
Is there no sound only
in AV mode?
Is the output of CXA2069
(IC300) normal?
No
YES
Is the MSP4450K(IC500)
operating normally?
Replace the IC500.
No
Is the NTP300A(IC501)
operating normally?
Replace the IC501.
No
YES
Replace the Main B/D.
YES
No
Replace the IC300.
Is the speaker on?
Set on speaker
on in menu.
No
Is the speaker cable
normal?
Check the
speaker cable.
No
Yes
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