Cubex Trio 3d Printer Repair

[Tumatauenga]

So recently my older brother decided to buy himself a second hand 3d printer, the Cubex Trio by Cubify. The unit doesn't have an on/off switch, it has to be switched off at the wall. Well, my brother was too lazy to dig behind some boxes to unplug it from the wall and decided to tune it, while it was on, accidentally connected 2 pins on the top of the unit with an allen key and shorted the unit.   

Now when plugged in, the LED's on the unit turn on, but the backlight on the LCD display does not turn on and the display itself cannot be used. As such the entire unit can no longer be used. The LCD display is plugged into the Mainboard on the bottom of the unit. The pins that were shorted are at the top of the print head.

We really need help figuring out how to fix this. We have a Fluke Multimeter to test it, but without knowing what to test we are up shit creek. Any help in this regard would be greatly appreciated. The attached pictures of the unit and the 2 boards.

[DaJMasta]

A little hard to tell, is that a 5 pin or a 4 pin connector that was shorted?  Do you know what it would connect to?

As for starters, check power rails and check resistance on the pins of the connector.  If you can find a ground somewhere in the system, check voltages on each pin and reference that to what should be there (why knowing what plugs in is important).  While powered down, you can also measure resistance between each of the pins in the connector, if you find something that's near a short, the damaged part(s) are probably connected to those pins.

If you find a power rail that is way under, you've probably damaged something in the power circuitry, so you want to see what is connected to it that could be the problem.  I think it's unlikely that you just blew some protection part given where the connector is and that the rest of the unit reacted like that.