LG BD390 Service Manual page 66

COMPONENT REPAIR GUIDE
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.
5-3. IC153
5-3-1. Solution
Replace IC153 on SMPS board.
5-3-2. How to troubleshoot (Countermeasure)
1) Please check 3.3V of CA710.
2) If 3.3V voltage doesn't come out, check PWR_CTRL of JIG909(front board).
--> If you figure out those power control doesn't come out any signal level (or voltage),
please replace IC901 of front board.
3) If P_CON_5.3V comes out 5V signal, replace IC153 of SMPS.
4) After changing it, if the set is still not booting, check MPEG IC(IC201). Refer to item 5-7.
5-3-3. Service hint (Any picture / Remark)
IC153
< SMPS board top view >
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