LG LAB550H Service Manual page 45

When you turn on your set, it will display "WELCOME" on front panel, and it will not boot-up normally.
2-4. IC502 (NAND FLASH MEMORY)
2-4-1. Solution
Replace IC502 on MAIN board.
2-4-2. How to troubleshoot (Countermeasure)
1) Please check physical status of IC502 on your eyes.
2) Check the VCC (3.3 V) of IC502 and if it's normal, please replace IC502.
(Please make sure IC502 has proper Program.)
3) After changing it, if the set is still not booting :
- Check DDR IC (IC503) refer to item 2-5.
- Check MT8553 IC (IC501) refer to item 2-6.
2-4-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
IC502 IC502
< MAIN board bottom view >
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