LG LAS551H - LG Sound Sync; With wired connection

3-8
ONE POINT REPAIR GUIDE
7. NO SOUND (OPTICAL)
7-1. Solution
Replace IC507 on MAIN board.
7-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 V of 3.3VA at L853 in HDMI & JACK board
If you can check 3.3 V, please confirm OPT_DET signal (R5R8) in MAIN board when optical mode.
2) In spite of process 1), set has abnormal output, then replace IC507.
7-3. Service hint (Any picture / Remark)
< HDMI & JACK board top view >
< MAIN board top view >
L853
L853
IC507
IC507
R5R8
R5R8