LG BH9530TW Service Manual page 53

When you turn on your set, it will display "WELCOME" on front panel, and it will not boot-up normally.
2-10. MAIN BOARD
2-10-1. Solution
Replace MAIN board.
2-10-2. How to troubleshoot (Countermeasure)
1) Please remove IC501 and IC502, IC503, IC504, IC505, IC506 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.
2-10-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
IC501
< MAIN board top view >
2-38
IC505
IC506
IC503
IC504