ORIGINAL: PilotLight
I was going to write this earlier, but now that you've asked...
Not knowing what is and isn't working, you could just remove the 3-in-1 all together since you have an aftermarket gyro. Just use a brushed ESC of appropriate amperage for the main motor (GP c-12 is $23). If the RX is fried, get a 4 channel Corona at BPhobbies.com about $20. Use the chrystal from the old Axe RX and you're up and running.
Sorry for your loss...[

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Thanks for the info, I already ordered the replacement Rx, but do you think the GP C-12 (which is the one I already have for the tail rotor) can handle the main motor? So I would literally just remove the 3in1 and just run from the Rx to the new ESC to the main motor, and then same for the tail, and of course the servos just plug in...
My only question left is: What's the deal with the voltage stepdown? I know it might be a newbie question, but it seems like Rx units run at something around 6-8v, but the motor runs at 11v, and the 3in1 takes the 11v, and somehow spits out power to the Rx board that then makes everything else run too (servos, etc). Where does the power modulation happen? If I go with an aftermarket ESC for the main rotor, then I KNOW I can just tap off the main battery feed just as I did for the already installed c-12. So.. by having a BEC (Battery eliminator circuit) mean that it does the step down FOR the Rx? So, for example, if I were running two C-12's, I would have to make sure that both BEC's weren't fighting with each other, huh?
Just need a little clarity, thanks.