LG BP540N Service Manual page 44

When you turn on your set, it will blank / no message or hello on front panel, 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 L153 on main board.
2) If 3.3 V voltage doesn't come out, check IC151 pin2(Vcc 5.1 VA).
When you figure out those power, if there is no 5.1 VA, please check 5.1 VA from SMPS.
For the solution please back to the solution 2.
3) If 5.1 VA input is normal, first of all check the PWR_CTL is high(CN150 pin6).
If PWR_CTL is high, check R172, L153, C179, R173, 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. (1.1 V, 1.2 V, 1.5 V)
- Check crystal X501 refer to item 3-5.
- Check NAND flash IC(IC603) refer to item 3-6.
- Check DDR IC(IC601, IC602) refer to item 3-7.
- Check MT8560 IC(IC501) refer to item 3-8.
3-2-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< Main board top view >
3-31
IC151