LG S75A1-D User Manual

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ELECTRICAL TROUBLESHOOTING GUIDE
5. OPTICAL
L203 should be 3.3 V.
Check power.
YES
YES
NO
OPT_SPDIF signal
should be shown (R207).
Check optical cable.
Check AMP.
Check MPEG (IC501).
NO
‘Optical’ should be displayed, when optical cable is connected well.
Even though all of above things are OK, there is no sound.

LG S75A1-D Specifications

General

Brand	LG
Model	S75A1-D
Category	Speakers
Language	English