Prusa MK3 heatbed shorted: replace just Einsy or heatbed too? Prusa MK3 heatbed power cable shorted out (on the Einsy side) and it looks like I need to replace the Einsy. Should I replace the heatbed too? I don’t know electronics well and am worried I will just fry a new Einsy.
Heatbed end:

Crispy at RAMBo end:

Crispy at RAMBo end:

Larger images can be found here.
There should be no need to replace the heat bed.  It wasn't subjected to any unusual loads.
If the bed isn't heating, there could be one of sever problems, but I would start with the fuse.  If the fuse had time to do its job, it would have blown and protected the circuitry.  In your picture, the fuse is the blue component with &quot;15&quot; stamped on top.  There are also two fuses with &quot;5&quot; stamped on top.  One of these may be blown.  If so, replace it and try again.
If the fuses are all good, and everything except the heat bed works, you have probably blown the FET that switches the heat bed power.  If you aren't handy with circuit board repair, you may choose to get an new Einsy controller and then try to repair your old one.  These repairs aren't usually hard because the FETs are fairly large components.