Read LG 42PB4RTH-TB (CHASSIS:PP7BA) Service Manual online
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14. No Sound
(1) Symptom
1) LED is green.
2) There is a picture but no sound.
2) There is a picture but no sound.
(2) Follow check
Is there sound in any
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 AV?
Is the output
of IC300(Pin52,53)
normal?
Yes
Is there no sound
only for RF?
No
No
No
No
Download the EDID data.
Set speaker on
in the menu.
in the menu.
No
Replace the
IC300
No
Check the Speaker
cable
cable
No
Is the IC400
operating normal?
Replace the IC400
No
Yes
Is the IC402
operating normal?
Replace the IC402
Replace the VSC BD
Yes
Check the signal after IC300.
refer to circuit diagram.
refer to circuit diagram.
Check the Tuner In/Out.
No
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