LG BD390 Service Manual page 71

When you turn on your BD-P, it will display "Hello" or "Please wait" message continuously on
front panel, and it will not boot-up normally.
5-8. Main board
5-8-1. Solution
Replace main board.
5-8-2. How to troubleshoot (Countermeasure)
1) Please remove IC201 and IC301~304
and then check the Impedance between each signal (DATA, ADDRESS, and so on.)
2) If there is some Impedance ( a few ohm or infinite ohm), PCB via might be broken.
and You'd better change MAIN board.
5-8-3. Service hint (Any picture / Remark)
IC301
IC304
COMPONENT REPAIR GUIDE
< Main board top view >
IC303 IC302
3-58
IC201