Failure Mode Flow Chart; Power Failed(Dead), No Display - LG LSE3092ST Service Manual

FAILURE MODE FLOW CHART

Power Failed(Dead), No
display?
Yes
Power On State
Check the key beep.
1
Touch the "clear key",
Is the beep sound?
No
Power Off State
2
Is the connector connected to
Power PCB disconnected or
disassembled? (CN1),
between Power PCB (CN10)
and Main PCB(CN9)
CN1
CN9
CN10
No
Yes
Go to No 4
Reconnect
Yes
or repair the
connector
6-1
Power Off
3
Is the electric wiring normal?
Measure the resistance Power
cord and CN01's connection
Normal : continuity
Abnormal: infinite
Code L1 to Pin1 of CN01(RD)
Code N to Pin3 of CN01(WH)
L1
Yes
GND
L1
L2
N
Replace the
No
defective
harness
Normal Abnormal
RD color is L1.
White color is N.
N