LG 42LV375H - Audio Troubleshooting; External Speaker Troubleshooting

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Only for training and service purposes
8. Audio Trouble Shooting guide
All input is no sound.
Check the input source &
input cable.
N
N
Only HDMI is no sound.
N
Only RF or DTV is no
sound.
N
Is the speaker normal? Check the speaker cable.
N
Is the speaker “on” on
Installation menu.
Y
Download the EDID
data.
Y
Check the Tuner in/out.
Y
Y
IC501 operate normal. Replace IC501.
N
Y
IC100 operate normal. Replace IC100.
N
Y
Replace main board.
Y
Set on speaker on menu.
9. External Speaker out Trouble Shooting guide
Check the input source. Check the input source.
N
N
IC502 operate normal.
Check the mute Line or
Replace IC502.
N
Is the External speaker setting
“Fixed or Ext/Int variable” on
Installation menu?
Y
Y
IC500 operate normal. Replace IC500.
N
Y
IC100 operate normal. Replace IC100.
N
Y
Replace main board.
Y
Set volume control “Fixed
or Ex/Int variable”.