ORIGINAL: PilotLight
Yes, the 3-1 has a BEC and steps the voltage down to 5 or so volts for the rx and servos.
Hopefully, you removed the power wire in the tail ESC per the instructions so the 3-1 wasn't fighting the tail esc. Most ESC's have a BEC.
Do you have a way to connect a 4.8 volt rx batt to check the receiver without the 3-1? (Just run the servos) Maybe its still good and only the 3-1 is fried.
FYI.. I ran my DMM over the 3in1 board yesterday afternoon, and confirmed my fears. Apparently when I reverse polarity zapped the 3in1 (which of course is the BEC for the Rx) I must have popped the BEC circuit, because it is/was now pumping a full 11v through the Rx connection on both wires, yes, even on the signalling wire. This easily explains at least one variable of why the Rx smoked.
After I #$%^&* and moaned about it for a while, I called my Not-so-Local-HS (1hr one way) and asked if they had any mini ESCs in stock. They're primariliy a copter shop, and he suggested I go with the GWS ICS-480 ESC for about 15$. Got it, wired it up, replaced all the battery connectors with the larger T-style Deans connections.. and now I should get my Rx board today.
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UPDATE: IT LIVES AGAIN!!! WWWWOOOOoooooooooo... *coughcough*
Just hovered through a 1320 LiPo. I have noticed immediately that either: A) The new Rx is more responsive, B) The new GWS ESC is more responsive and powerful or C) all of the above.
The throttle response is much smoother, and seems like it has a bit more kick to it. Other than that, the LOA and GY240 are both working beautifully. Now, back to the warehouse where my Axe met it's most recent demise. Let's see if I can keep'er running.
When is an Axe no longer an Axe? I suppose I still have it's motors, and it's Rx board... and the frame...