Creator (wood): Is my motherboard toast

[Roberts_Clif]

Start with disconnecting the hotbed see if that changes anything, most likely you fried your hotbed mosfet.
This is an easy fix if you know how to solder on circuit boards. And this is the reason I purchased a spare controller!

[indy3der]

ok. I unplugged the connector from the back of the hotbed and same thing.

Do I need to desolder the MOSFET to know if that's the culprit?

[Roberts_Clif]

You should also check to see if the that the bed wires are not shorted between the controller connector bed pins. Have seen the wires touching outside of the connector before.
(If this is a new 3D Printer it could be as simple as too much solder around the mosfet causing it to short, or i could be a shorted circuit board trace.

In this picture the trace was open I simply soldered a bridge across the trace.

Image2.jpg

You can simply ohm the connector pins for the hotbed, if the resistance across the pin is low resistance then it could be shorted.

You can also measure the resistance between the mosfet pins to see if it is shorted. Then you can remove and the mosfet.

[indy3der]

I'll check the resistance across the MOSFET pins tonight. I've also got a loaner printer coming from a friend tonight as well to help me diagnose further.

I'm holding out hope for a simple MOSFET swap, but if it's a board I may just pull forward my plans to move on to another printer.

[Roberts_Clif]

I am sure you will find a solution, and most likely it is the mosfet.

And I have printed many 3d Models in PLA without having the heated bed on.

or you could use an external Digital high temperature controller

Here
or
Here

Supply Voltage for thermostat (4 options): 12VDC, 24VDC, 110VAC, 220VAC