Sound (Optical) - LG SJ3 Service Manual

6. NO SOUND (OPTICAL)
6-1. Solution
Replace IC501 on MAIN board.
6-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 V of 3.3VA at R549.
If you can check 3.3 V, please confirm OPT_IN signal (R528) when optical mode.
2) In spite of process 1), set has abnormal output, then replace IC501.
6-3. Service hint (Any picture / Remark)
R549 R549
JK502 JK502
R528 R528
ONE POINT REPAIR GUIDE
R549 R549
R528 R528
< Optical circuit >
< MAIN board top view >
3-7
JK502 JK502