Read LG 32LC4D (CHASSIS:LT73A) Service Manual online
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14. No Sound
(1) Symptom
1) LED is green.
2) Screen display but sound is not output.
2) Screen display but sound is not output.
(2) Check following
Is there sound
in an mode?
Is the speaker
on?
Yes
Yes
Is the speaker
cable normal?
cable normal?
Yes
Yes
Is there no sound
only for HDMI?
Yes
Is there no sound
only for RF?
Check the Tuner
IN/OUT
Yes
Is there
no sound only for
AV/component/PC
input?
No
No
No
No
Download the EDID data.
Set on speaker
in menu.
in menu.
No
Check the Speaker
cable.
cable.
No
Is the IC1300
operating normal?
Replace IC1300.
(MSP4450)
(MSP4450)
No
Yes
Is the IC1301
operating normal?
Replace IC1301.
(STA335BW)
(STA335BW)
Replace VSC B/D.
Is the output of
CXA2069 normal?
CXA2069 normal?
No
Check the siganl before
CXA2069 refer to circuit
diagram
CXA2069 refer to circuit
diagram
Check the signal after CXA2069.
Refer to circuit diagram.
Refer to circuit diagram.
No
Replace CXA2069
No
Yes
Is there
no sound Only for
specific input (except
HDMI, DTV,
RF)?
Yes
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