LG S65T1-W Service Manual page 46

When you turn on your set, it will blank / no message or Welcome on front panel, and it will not boot-up.
2-3. IC151 (No 1.2 V & 1.5 V)
2-3-1. Solution
Replace IC151 on MAIN board.
2-3-2. How to troubleshoot (Countermeasure)
1) Please check 1.2 V & 1.5 V of IC151 on MAIN board.
2) If 1.2 V voltage doesn't come out, check IC151 pin22 (VCC 5.5 VA).
If 1.5 V voltage doesn't come out, check IC151 pin9 (VCC 5.5 VA).
If there is no 5.5 V, please check 5.5 VA from SMPS.
3) If 5.5 VA input is normal, first of all check DC15_12_CTRL is high (IC101 pin24).
If DC15_12_CTRL is high, check R159 and if there's no defective component then please replace IC151.
4) After changing it, if the set is still not booting :
- Check 1.2 V, 1.5 V, 3.3 V is normal. (please refer to other sections of this guide)
- Check Crystal X501 refer to item 2-4.
- Check NAND Flash IC (IC503) refer to item 2-5.
- Check DDR IC (IC502) refer to item 2-6.
- Check MT8563 IC (IC501) refer to item 2-7.
2-3-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
IC151 IC151
< MAIN board top view >
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