One Point Repair Guide; No Booting When You Turn The Unit On - LG BP340 Service Manual

1. NO BOOTING WHEN YOU TURN THE UNIT ON

When you plug power cord and turn the unit on, LED light won't turn green, the unit won't output
video and read disc normally.
1-1. Please check every output voltage.
1) Please check if output voltage 12 V from main board C92 is normal.
If output voltage 12 V is not normal, please check the working status of SMPS board.
2) Please check if output voltage 5 V from main board C34 is normal.
If output voltage 5 V is not normal, please check the working status of main board U5 and its peripheral
circuit.
3) Please check if output voltage 3.3V_STBY from main board C3 is normal.
If output voltage 3.3V_STBY is not normal, please check the working status of main board U4 and its
peripheral circuit.
4) Please check if output voltage 3.3 V from main board C21 is normal.
If output voltage 3.3 V is not normal, please check the working status of main board U4 and its peripheral
circuit.
5) Please check if output voltage 1.5 V from main board C25 is normal.
If output voltage 1.5 V is not normal, please check the working status of main board U4 and its peripheral
circuit.
6) Please check if output voltage 1.2 V from main board C20 is normal.
If output voltage 1.2 V is not normal, please check the working status of main board U4 and its peripheral
circuit.

ONE POINT REPAIR GUIDE

< Main board top view >
C23
C92
3-2
C25
C3