LG SJ9 - Page 51

3-14
ONE POINT REPAIR GUIDE
PROTECTION ERROR
No display or No Sound.
3-3. B(BURNT) PROTECTION
3-3-1. Solution
Replace MAIN board.
3-3-2. How to troubleshoot (Countermeasure)
1) Check voltage 20 V of IC706, IC708, IC707, IC710 at pin17, 18, 19, 31, 32, if 12 V has problem refer to
STEP 1-1.
2) If 20 V is OK, replace MAIN board.
3-3-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC710
IC710
IC707
IC707
IC708
IC708
IC706
IC706