LG BPM54N Service Manual page 48

When you turn on your set, it will display "HELLO" on front panel, and it will not boot-up normally.
3-6. IC603 (NAND FLASH MEMORY)
3-6-1. Solution
Replace IC603 on main board.
3-6-2. How to troubleshoot (Countermeasure)
1) Please check physical status of IC603 on your eyes.
2) Check the Vcc(3.3 V) of IC603 and if it's normal please replace IC603.
(Please make sure IC603 has proper program.)
3) After changing it, if the set is still not booting:
- Check DDR IC(IC601, IC602) refer to item 3-7.
- Check MT8560 IC(IC501) refer to item 3-8.
3-6-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< Main board bottom view >
3-35
IC603