LG SJ3 - Using the Music Flow Bluetooth App; Activate Bluetooth via App

3-7
ONE POINT REPAIR GUIDE
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)
< MAIN board top view >
< Optical circuit >
JK502
JK502
JK502
JK502
R528
R528
R528
R528
R549
R549
R549
R549