Images below. In the first image you can see the board header for the heated bed (the two screw terminals to the left of the large capacitor). The position on the right is the V+ trace that burned out on my board. The large white wire in the foreground is the wire that should be plugged in to this terminal, but is now jumpered to the fuse. You can see that the GND wire returning from the bed heater is still in its original position in the header
The white wire in the foreground of the first image is not just big and blurry because camera, but also because it is two wires spliced and then covered with shrink tube that you can see in image 2. Basically, I cut off the crimped contact at the end of the V+ wire and spliced in some additional length of heavy (I think I used 16awg) wire to add some length for a jumper. In the second image you can see where that new wire end is seated in the left-hand blade of the fuse. This is the negative side. Current flows positive => negative, so from the negative contact of the fuse to the positive contact of the bed heater, through the bed heater itself and then back out to ground. Basically, the burned-out V+ pin is directly connected to the left-hand blade of the fuse, so the pixies just taking a slight shortcut around the burned-out contact.
To secure the new end of the wire I removed the fuse, took the end of the stranded jumper wire and seated it in the slot, and then reinserted the fuse, sandwiching-in the jumper wire. I’ve put hundreds of hours on the machine since then with zero bed-heater issues. HTH!
