LVC/ 9920 problem

I recently bought this for my 9920/ 8l on 4s lipo setup in my e maxx. I plugged it in and at first it looked fine, it worked and there was no smoke. I went to drive it a few seconds later, and it worked for a few throttle pulls, then the throttle started acting weird. I would accelerate then let off, but the car would be slow to react to me letting off. I was pulling it back in because of this when it started pouring out smoke. I unplugged the battery as fast as I could, and I found the negative signal wire on the 9920 was all melted and burnt looking. Ive since tested the LVC on another (cheaper) setup, and the LVC is dead. I pulled the heatshrink off, and theres no visible damage to the circuit board. The LVC did no damage to the other setup I tested it on, it just didnt give any power to the receiver. Im hoping I just have a defective LVC, and that I can replace the wire on the 9920 and all will be well, but Im fearing worse than that. I havent tested the 9920 since the negative signal wire smoked. Any help would be appreciated.