LG SPH7B-W User Manual

3-5
ONE POINT REPAIR GUIDE
4. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET.
4-1. IC307 (NO 1.2V)
4-1-1. Solution
Replace IC307 on MAIN board.
4-1-2. How to troubleshoot (Countermeasure)
1) Please, check 12 VA L311 of IC307 pin3 (VIN).
2) If 12 VA is abnormal, follow the stage 1-1 (IC302).
3) If 12 VA is OK, check DCDC_12_15_CTRL (R333).
If it is not high state, follow the stage 9-1 (IC100).
4) If it is high state, please replace IC307.
4-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC307
IC307

LG SPH7B-W Specifications

General

Brand	LG
Model	SPH7B-W
Category	Speaker System
Language	English