Read LG 42LY99-ZC (CHASSIS:LD75C) Service Manual online
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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) Screen display appears but there is no sound.
(2) Check follow
is there no
sound for all input
(modes)?
Is the speaker on?
Set on speaker in
menu.
Is the speaker
Cable normal?
Check the Speaker
Cable.
Cable.
Is the IC1300
operating normally?
Replace IC1300
(MSP4450)
Is the IC1301
operation normally?
Replace IC1300
(STA335BW)
Replace VSC B/D.
Yes
No
Is there no sound
only for HDMI?
Yes
Download the EDID data.
No
No
No
No
No
Only RF is
no sound?
no sound?
Yes
Check the Tuner IN/OUT
No
Check the signal before
CXA2069 refer to circuit diagram
CXA2069 refer to circuit diagram
Is there
no sound only for
AV/ Component/ PC
input?
Yes
Is there
no sound only for
specific input? (except
HDMI,DTV,RF)
Yes
Is the output of
CXA2069 normal?
Check the signal after CXA2069
refer to circuit diagram.
refer to circuit diagram.
No
Replace CXA2069
No
Yes
Yes
Yes
Yes
No
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