RE: My rx melted!
I'll bet it was a Futaba receiver and that you plugged the battery connector into the battery slot reversed. On many of the older futaba receivers, the center pin and the ground pin are connected together in the battery slot ONLY. Now if you plug the battery connection in backwards, you get an instant short on the battery cable which usually burns out the wireing to the battery before any other damage is done although the copper strip connecting those two pins together on the receiver could be burned open. If you had plugged the battery into any slot other than the battery slot, no damage would have occurred anywhere, it just would not have powered up the receiver. Chances are good that the receiver has not been damaged if the power pins are still intact.