LG 42PC1RV Series, Service Manual

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6. No Sound
(1) Symptom
1) Front LED is Green.
2) The Set display a screen, but a sound doesn’t output.
(2) Check following
Are Speaker Cables Good?
Are Speaker Cables Good?
Are Speaker units good?
Download EDID data
once more.
Exchange IC401
No No
Yes Yes
Are Speaker Cables Good? Are Speaker Cables Good? Are Speaker units good?
Yes Yes
Is sound at Scart1/2
(or Component2)RGB,
or Side AV Good?
Are good some elements
(C, R, L, or Diode)
at Sound path?
Is IC800 good?
(Switching IC)
Is IC601 good?
(VCT-P)
1) Speaker part
2) Main board part
No No
No
No Yes
Yes
Yes
Is sound at HDMI Good?
Is EDID download
good?
Is IC401 good?
(AD9381)
No Yes
If it dead or short,
exchange this elements
Exchange IC800
No
No
Exchange IC601
No
Is IC801 good?
(Amplifier)
Exchange IC801
No
If it dead or short,
exchange this elements
No
Is sound at RF, AV, or
Component1 Good?
Are good some elements
(C, R, L, or Diode)
at Sound path?
No