Yeah, I think the cable would be my first suspect as well. And by cable I mean more the contact and/or the individual pins in case one of them has managed to work itself loose.
It's unlikely you managed to damage both cores so I would probably rule that out. And it's not really possible to assemble the head with the print head board in the wrong position causing a bad connection.
And from the sounds of it, it's happening when the print head is homed, when there's the most stress on the cable.
assuming that this error was not present before you disassembled the print head, I guess a cable connection is loose somewhere. Maybe @IRobertI has a better idea.
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