LG SL7Y Service Manual page 38

PROTECTION ERROR
No display or No Sound.
3-2. B(BURNT) PROTECTION
3-2-1. Solution
Replace AMP board.
3-2-2. How to troubleshoot (Countermeasure)
1) Check voltage 12 V of IC700, IC701, IC702 at pin1 ~ 2, if 12 V has problem refer to STEP 1-1.
2) If 12 V is OK, replace AMP board.
3-2-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
IC700 IC700
< AMP board bottom view >
IC701 IC701
3-13
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IC702 IC702
Only for training and service purposes.