DAEWOO DLP-42C1
Instrukcja Serwisowa

Main PCBs Trouble Diagnosis

7-1-3. When Control Key does not operate

Check Start

N After turn on the power, does LED turn on red light?

1. Check AC connection 2. Check Power S/W ON 3. Check other PCBs

Y

After ST-BY on Does LED turn on green light?

N

Check the connection of KEY PCB to MAIN PCB -> Check the connection between KEY PCB and MAIN PCB

Y

Is output first pin PW7 normal?

N

1. Replace the CON NECTOR 2. Replace KEY PCB

Y

Check Main PCB

A. First check connection, and then check the output of first pin of PA912(ST-BY 3.3V) B. Check waveform first pin and third pin of PA911. If waveform does not appear, replace connector or KEY PCB. -main TP : RC398, RC399

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