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I checked the connectors, they have high resistances like you said. And here's a picture of the hotend Pcb maybe it could help

I also think it's a fuse failure. The board wouldn't even start up if I plug it into USB, but my laptop recognizes that it was plugged in. The question is now why did the fuse fail, I checked the wiring and found nothing, all the wires are were they should be.

Nothing happens, the Rambo board doesn't power on, the first time I powered It on the machine activated for about a second then shut off

Hello I'm new to 3D printing and have against my better judgement decided to build a Rostock Max v3 from a kit as my first printer and can't seem to get it to work first the hot end wouldn't work then I fixed that then the fan in front on the thermal wouldn't work I got a replacement fan but when I ...