Read LG 42LF75 / 42LF76 (CHASSIS:LD75B) Service Manual online
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5. In case of 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 follow
All input (mode)
is no sound?
Is the speaker
On it men?
Set on speaker in
menu.
Is the speaker
Cable normal?
Check the Speaker
Cable
IC1300 operates
Normal?
Replace IC1300
(MSP4450)
IC1301 operates
Normal?
Replace IC1301
(STA335BW)
Replace VSC BD
Yes
No
Only HDMI is
No sound?
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
Only
AV/component/PC
input is no sound?
Yes
Only specific input
(except HDMI,
DTV,RF) is no
DTV,RF) is no
sound?
Yes
Is the output of
CXA2069 normal?
Check the signal after CXA2069
refer to circuit diagram
No
Replace CXA2069
No
Yes
Yes
Yes
Yes
No
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