Read LG 26LC7D / 26LC55 (CHASSIS:LD73A) Service Manual online
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6. 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
All input(modes) have
no sound?
Only HDMI has No
Sound?
No
Yes
Download
the EDID data
Check the signal after
CAX2069 refer to circuit diagram
No
Only specific input
(except HDMI,DTV,RF)
has no sound?
Check the signal before
CAX2069 refer to circuit diagram
No
YES
YES
Only RF has no
sound?
Check
the Tuner IN/OUT
No
YES
YES
Only AV/component/PC
input has no sound?
Is the output of
CXA2069 normal?
No
YES
IC1300 operates
normally?
Replace the IC1300
(MSP4450)
No
IC1301 operates
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
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