Sankey CLCD-2630 - Troubleshooting: No Picture

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4. No Picture
Black Screen
Check BLON, control the electrocircuit
Check if using the right voltage CN6
Check the cables to the panel
Check if U4(4405)Pin4 using right voltage
Check U4, control the electrocircuits
Check if U3 Pin2 is150KHz
OK
Replace L21
Y
N