LG DU-37LZ30, Service Manual

Page: 13 / 45

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TROUBLESHOOTING
No Power
Replace Power board
Replace D_power_board
Replace power_board Push the POWER ON key.
OK
Connect the connectors
Check the
condition of the power-
related connectors.
Fail
Measure standby
voltage:
6V at D_board P810
pin no. 1
Fail
Pass
Pass
Measure digital
reference voltage:
24V at Power Board
CN304 pin no. 15
Measure standby
voltage:
6V at A_board P818
pin no. 6
Fail
Pass
Measure analog
reference voltage:
24V at Power Board
CN303 pin no. 15
Does the set turn on
normally?
Fail
Pass Pass
Check the POWER ON
signal level:
D_board P811 pin no. 2
and 3 > 0.8V
Measure
D_board supply voltage:
3.3V at P810 pin no. 7
6V at pin no. 11, and 12V at pin
no. 3