LG BPM55 Service Manual page 42

3. 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.
3-1. IC153 (No 3.3 VA)
3-1-1. Solution
Replace IC153 on main board.
3-1-2. How to troubleshoot (Countermeasure)
1) Please check 5.1 VA of IC153 pin1 (Vin).
2) If 5.1 VA is abnormal, refer to the solution 2-1 at the previous page.
3) If 5.1 VA is OK, but 3.3 VA is abnormal at the IC153 pin5 (Vout), replace IC153.
3-1-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
< Main board top view >
3-29
IC 153
IC153