LG S94T1-S Service Manual page 51

When you turn on your set, it will display "WELCOME" on front panel, and it will not boot-up normally.
2-8. IC503, IC504, IC505 (DDR3 MEMORY)
2-8-1. Solution
Replace IC503, IC504, IC505 on MAIN board.
2-8-2. How to troubleshoot (Countermeasure)
1) Please check 0.75V of DDR3_VREF. (between C5D1 and C5D2).
Please check 0.75V of DDR3_VREF. (between C5D5 and C5D6).
Please check 0.75V of DDR3_VREF. (between C5D9 and C5E0).
Please check 1.5V of IC503, IC504, IC505.
2) If it doesn't work even though IC150, IC155 are no problem,
IC503, IC504, IC505 (DDR memory) could have problem.
3) After changing it, if the set is still not booting:
- Check MT8580 IC (IC501) refer to item 2-9.
- Check MAIN board refer to item 2-10.
2-8-3. Service hint (Any picture / Remark)
IC501
ONE POINT REPAIR GUIDE
IC503
IC504
IC505
< MAIN board top view >
< MAIN board bottom view >
C5D1
C5D2
C5D5
C5D6
C5D9
2-36
C5E0