Daewoo DT-4220NH Service Manual page 45

Main PCB Trouble Diagnosis
6. When Key does not operate
Is 5th pin from the top of PC102 output normal?
Check start
Y
Does LED next to Power S/W
turn on (red light)?
Y
Does LED turn on (green light)?
Y
Y
Check MAIN PCB
1. Check AC connection
N
2. Check Power S/W ON
3. Check other PCBs
N
Check the connection of KEY
PCB toMAIN PCB
N
1. Replace the CONNCETOR.
2. Replace Key PCB.
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