Daewoo DPN-4274NHS Service Manual - page 46

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Main PCB Trouble Diagnosis

N

Check the connection of LED PCB 

to MAIN PCB

Check start

N

N

N

Y

Y

Y

Replace LED PCB.

Y

Y

Does LED next to Power S/W 

turn on (red light)?

Is Remote Controller

working?

Does Set turn on by

pressing a key button?

Using an oscilloscope

check TP113 near PC101.

Does it output a signal whenever a remote

controller button is pressed?

1. Check AC connection

2. Check Power S/W ON

3. Check other BLOCKs

Check the Battery of

Remote Controller

1. IR Receiving BLOCK of MAIN PCB is not

    working.

2. Replace MAIN PCB

7. When Remote Controller does not operate