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Originally Posted by TonzOFun
It isn't the speed controllers and relays, it seems to be a progressive failure of the board.
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Time to fundraise for a new RC.
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Before you buy a new RC, make sure there is nothing metallic shorting out any of the pins on the RC. We had an incident this past year where a metal shaving was causing a short between one of the 5v pins and a ground pin. We found this shaving
underneath the black plastic of the pin connectors (the plastic that holds the pins together). It was between this plastic and the PCB of the RC. It took a while to find this problem since a "normal" inspection didn't reveal anything that would cause a short. We had to hold it at the right angle to the light such that we could view down this very narrow gap to identify the shaving. Once we got it out the RC was fine (those IFI guys do a nice job of making hardware that is resistant to things like that).
Anyway, the point of the story is that you might want to spend some time with an airhose and make sure the board is fully cleaned of any debris and then bench-test it before you declare it dead.