LG LAP340 - Audio out in Optical Function

3-5
ONE POINT REPAIR GUIDE
4-3. Service hint (Any picture / Remark)
4. NO AUDIO OUT IN OPTICAL FUNCTION
4-1. Solution
Check optical jack, audio DSP and audio output trace on main board.
4-2. How to troubleshoot (Countermeasure)
1) Please check JK301’s Pin1 (optical input signal).
2) Abnormal optical signal input condition Ö Check JK301 working status.
3) Normal optical signal input, abnormal IC301 operation conditions Ö Check IC301, IC303.
4) Normal IC301 operation conditions Ö Check no audio output sheet.
< Main board top view >
IC301
IC303
JK301