No Booting When You Turn The Unit On - LG BPM55 Service Manual

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.
3-2. IC151 (No 3.3 V)
3-2-1. Solution
Replace IC151 on main board.
3-2-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 V of IC153 on main board.
2) If 3.3 V voltage doesn't come out, check IC151 pin2 (5.1VA).
If there is no 5.1 VA, back to the solution 2.
3) If 5.1 VA input is normal, first of all check the PWR_CTL is high (Q501 pin2).
If PWR_CTL is high, check R172, L153, C179, R174, R175, R176
and if there's no defective component then replace IC151.
4) After changing it, if the set is still not booting:
- Refer to the next page for checking another power source. (1.2 V, 1.5 V)
- 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.
3-2-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
IC 151
< Main board top view >
3-30
IC151