One Point Repair Guide; Set Doesn't Booting When You Turn On The Set - LG SJ4Y Service Manual

Wireless sound bar

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Front LED doesn't work.

1-1. IC302 System 12 VA (No 12 VA)

1-1-1. Solution

Replace MAIN board.

1-1-2. How to troubleshoot (Countermeasure)

1) Please check 25 VA of IC302 pin2 (VIN).

2) If 25 VA is abnormal, please check adapter.

3) If 25 VA is OK, but 12 VA is abnormal pin3 of IC302 (VOUT), replace MAIN board.

1-1-3. Service hint (Any picture / Remark)

ONE POINT REPAIR GUIDE

< MAIN board top view >

 

IC302

 

L302

IC302

 

3-5

Only for training and service purposes.

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