Daewoo DT-4220NH Service Manual page 46

Main PCB Trouble Diagnosis
7. When Remote Controller does not operate
Does it output a signal whenever a remote
1. IR Receiving BLOCK of MAIN PCB is not
working.
2. Replace MAIN PCB
Check start
Y
Does LED next to Power S/W
turn on (red light)?
Y
Is Remote Controller
working?
Y
Does Set turn on by
pressing a key button?
Y
Using an oscilloscope
check TP113 near PC101.
controller button is pressed?
Y
N
1. Check AC connection
2. Check Power S/W ON
3. Check other BLOCKs
N
Check the Battery of
Remote Controller
N
Check the connection of LED PCB
to MAIN PCB
N
Replace LED PCB.
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