LG S92T2-C Service Manual page 50

When you turn on your set, it will display "WELCOME" on front panel, and it will not boot-up normally.
2-9. MAIN BOARD
2-9-1. Solution
Replace MAIN board.
2-9-2. How to troubleshoot (Countermeasure)
1) Please remove IC501 and IC502, IC503, IC504 and then check the Impedance between each signal
(DATA, ADDRESS, and so on).
2) If there is some Impedance (a few Ω or infinite Ω) especially power source trace,
PCB via might be broken. You'd better replace MAIN board.
2-9-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< MAIN board bottom view >
2-37
IC501
IC503
IC504
IC502