Troubleshooting - LG DU-42LZ30 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 D_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 line filter P810
Replace D_power_board
Measure analog
reference voltage:
24V at A_board P818
Replace A_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 Filter board
pin no. 1
pin no. 15