Daewoo DLP-20D7 - Troubleshooting: Inverter Backlight Issues

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Inverter
10-4. Troubleshooting
*Backlight doesn’t turn on
Is voltage of pin#1~5 of CN1 24V?
Is voltage of pin#12
of CN1 under 3.0V?
Check Power.
Check Main PCB.
Check start
Y
N
N
Y
Y
Exchange Inverter or panel.