LG LAS454B - Sound (Optical)

3-7
ONE POINT REPAIR GUIDE
6. NO SOUND (OPTICAL)
6-1. Solution
Replace IC507 on MAIN board.
6-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 V of 3.3VA at L503.
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.
6-3. Service hint (Any picture / Remark)
< MAIN board top view >
JK501
JK501
IC507
IC507
L503
L503
R5R8
R5R8