LG BPM55 Service Manual page 48

NO BOOTING WHEN YOU TURN THE UNIT ON
When you turn on your set, it will blank/ no displaying Main Menu on Television/ Monitor,
and it will not boot-up.
3-7. IC601 (DDR3 MEMORY)
3-7-1. Solution
Replace IC601 on main board.
3-7-2. How to troubleshoot (Countermeasure)
1) Please check 0.75 V of DDR3_VREF (C606, R607).
Please check 1.5 V of C613.
2) If it doesn't work even though IC150, IC151, IC152, IC153 are no problem,
IC601 (DDR memory) could have problem.
3) After changing it, if the set is still not booting:
- Check MPEG IC (IC501) refer to item 3-8.
- Check main board refer to item 3-9.
3-7-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
IC601, C606, R606
< Main board top view >
3-35
IC 601