Originally Posted by ThrakenSal
OK Finally got my new battery and now the stinking radio won't work.
Let's go back to square one and try to figure this out. You said you replaced the motor battery but how did you confirm the battery was bad? Would it not charge with the included charger? Second, when the new battery arrived did it work on existing charger? Are you able to check the voltage on this new battery?
"Chattering" from your servos usually means it can not get a signal from your transmitter. This can be from dead TX batteries, a loose TX antenna, poor location or broken receiver antenna, loose crystal on the receiver, or a bad servo.
Here's is my suggestion. Pull the receiver out (if it can be removed easily) and plug in a 4.8/6v receiver battery directly into it. If you don't have one, take everything to your LHS and ask if you can borrow one. Plug in ONE servo to the receiver and turn on your transmitter. Try using the transmitter to run the servo in each channel. If this works then you have hopefully ruled out the expensive pieces (receiver / transmitter). Next you will want to plug in the ESC/BEC into channel 3, plug in your LiPo (no motor necessary) and see if the speed controller is providing enough power. If this works, then we might want to check the servos in the plane. I've had a bad servo that caused all kinds of problems with my receiver. Swapping it out did the trick.
Start with basic parts and then add one at a time. That's the best way to troubleshoot this problem. From what you've said...my guess would be an antenna (RX or TX) issue or a bad cable connection.
Let us know.