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[Sticky] Blank screen

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hello

I was trying to install a BL Touch on my ender 3 pro 4.2.2 board, however when i connected the two BL Touch cables to the board it caused smoke, after updating the board firmware to an enabled BL Touch version i tried again, same thing however after a second attempt the screen went blank after the smoke and now it will not turn on?

I have looked at the board and power supply and everything is good thee, I have also swapped the screen cable to a different port on the screen and i have also tried reverting back to the factory marlin but still nothing.

I am new to this so any help would be great

Thanks  

Adam