i had a problem with the printer, it shut down and no signal at all after doing few research i came across that the motherboard working fine, the screen is totally black i controlled the printer using Cura interface and the axes moves but the X axes switch doesn’t stop the extruder from stopping , Also bed temp went to max once i turn the printer on and don’t touch anything.
Hmm doesn’t necessarily sound to me like the mainboard is working fine 
Do you have another mainboard kicking around?
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I switched today to another motherboard this time cura reading the printer but when i hit homing nothing happens, the bed temp doesn’t go up anymore and the screen still black