LG BH5140S Service Manual page 49

2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
"PLEASE WAIT" ON FRONT PANEL
When you turn on your set, it will "PLEASE WAIT" display on front panel, and it will not boot-up
normally.
2-6. IC504 (NAND FLASH MEMORY)
2-6-1. Solution
Replace IC504 on MAIN board.
2-6-2. How to troubleshoot (Countermeasure)
1) Please check physical status of IC504 on your eyes.
2) Check the VCC (3.3 V) of IC504 and if it's normal, please replace IC504.
(Please make sure IC504 has proper program.)
3) After changing it, if the set is still not booting :
- Check DDR IC (IC502, IC503) refer to item 2-7.
- Check MT8560 IC (IC501) refer to item 2-8.
2-6-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< Main board bottom view >
2-34
IC501
IC504 IC503
IC502