LG BPM55 Service Manual page 45

NO BOOTING WHEN YOU TURN THE UNIT ON
When you turn on your set, it will blank/ no displaying Main Menu on Television/ Monitor,
and it will not boot-up.
3-4. IC150 (No 1.2 V)
3-4-1. Solution
Replace IC150 on main board.
3-4-2. How to troubleshoot (Countermeasure)
1) Please check 1.2 V of IC150 pin11/ pin12.
2) If 1.2 V voltage doesn't come out, check IC150 pin13 (12 VA).
If there is no 12 VA, go to previous solution to check it.
3) If 12 VA is OK, check the PWR_CTL is high
and if it's high check C167, L151, R166, R167, R168, C170, C171, C172, C173
and if there's no defective component, please replace IC150.
4) After changing it, if the set is still not booting:
- Check 1.2 V/ 3.3 V/ 3.3 VA is normal. (please refer to other sections of this guide)
- Check Crystal X501 refer to item 3-5.
- Check NAND flash IC (IC602) refer to item 3-6.
- Check DDR IC (IC601) refer to item 3-7.
- Check MPEG IC (IC501) refer to item 3-8.
3-4-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< Main board top view >
3-32
IC150