LG S94T1-S Service Manual page 45

ONE POINT REPAIR GUIDE
When you turn on your set, it will blank / no message or Welcome on front panel, and it will not boot-up.
2-2. IC155_System 3.3 V (No System 3.3 V)
2-2-1. Solution
Replace IC155 on MAIN board.
2-2-2. How to troubleshoot (Countermeasure)
1) Please check 3.8 VA of IC155 pin3 (VIN).
2) If 3.8 VA is abnormal, please check SMPS 3.8 VA.
3) If 3.8 VA is OK, but 3.3 VA is abnormal at the IC155 pin6 (VOUT), replace IC155.
2-2-3. Service hint (Any picture / Remark)
IC155
< MAIN board top view >
2-30