LG BD390 Service Manual page 69

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.
5-6. IC301 ~ IC304
5-6-1. Solution
Replace IC301 ~ IC304 on main board.
5-6-2. How to troubleshoot (Countermeasure)
1) Please check 0.9V of DDR2_1_VREF.(between R227 and R228).
Please check 0.9V of DDR2_0_VREF.(between R217 and R224).
Please check 1.8V of CA714.
Please check 3.3V of CN701 pin #1 Please check the soldering status of 27Mhz crystal (X504)
2) If it doesn't work even only one and IC706,IC704, IC153 are no problem,
IC301,302,303,304(DDR memory) must be changed.
3) After changing it, if the set is still not booting,
check MAIN PCB. Refer to item 5-8.
5-6-3. Service hint (Any picture / Remark)
IC301
DDR2_0_VREF
IC304
IC303
IC302
DDR2_1_VREF
< Main board top view >
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