Troubleshooting - LG du-37lz30 Service Manual

No Power
Check the
condition of the power-
related connectors.
Pass
Measure standby
voltage:
6V at D_board P810
pin no. 1
Pass
Measure standby
voltage:
6V at A_board P818
pin no. 6
Pass
Push the POWER ON key.
Does the set turn on
normally?
Pass
OK

TROUBLESHOOTING

Fail
Fail
Fail
Fail
- 13 -
Connect the connectors
Measure digital
reference voltage:
24V at Power Board
CN304 pin no. 15
Replace D_power_board
Measure analog
reference voltage:
24V at Power Board
CN303 pin no. 15
Replace power_board
Check the POWER ON
signal level:
D_board P811 pin no. 2
and 3 > 0.8V
Pass
Measure
D_board supply voltage:
3.3V at P810 pin no. 7
6V at pin no. 11, and 12V at pin
no. 3
Replace Power board