Daewoo LM32L1 - 6-1-3.When Control Key Does Not Operate

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Main PCBs Trouble Diagnosis
6-1-3.When Control Key does not operate
After turn on the power,
does LED turn off?
Check start
Y
Y
N
1.Check AC connection
2.Check Power S/W ON
3.Check other PCBs
After ST-BY on, Does LED
turn on blue light?
N
Check the connection of
KEY PCB to MAIN PCB
=> Check the connection between
KEY PCB and MAIN PCB
Check Main PCB
Y
Is output first pin P903 normal?
N
1. Replace the connector
2. Replace KEY PCB