LG S65T1-S Service Manual page 48

When you turn on your set, it will display "WELCOME" on front panel, and it will not boot-up normally.
2-5. IC503 (NAND FLASH MEMORY)
2-5-1. Solution
Replace IC503 on MAIN board.
2-5-2. How to troubleshoot (Countermeasure)
1) Please check physical status of IC503 on your eyes.
2) Check the VCC (3.3 V) of IC503 and if it's normal, please replace IC503.
(Please make sure IC503 has proper program.)
3) After changing it, if the set is still not booting :
- Check DDR IC (IC502) refer to item 2-6.
- Check MT8563 IC (IC501) refer to item 2-7.
2-5-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< MAIN board bottom view >
2-33
IC503 IC503