Aircraft disconnected/ no image transmission

[Anewtoi]

After a bad crash I got new landing gear, birdside external antennas and installed. I had the aircraft all apart to remove the internal antennas. Before buttoning everything back together I checked the app and got video feed and power. Since I finished buttoning up there's no transmission and only connects with the tx for 5 or so seconds followed by 30 secs of aircraft disconnected.
While saying disconnected, the tx can activate one rotor while another just stutters and the other two do nothing
The one rotor responds when commanded to elevate,pan right, throttle left and reverse

I did notice I accidentally put one of the ARGtek 2.4ghz antennas on the 5.8ghz port

Things I've tried include:
Linking rc-they both respond in the affirmative to link command
Checked all connections bird and tx
Different batteries
Apple and android devices

Questions:
Could this be a main esc issue because I just got a great deal on eBay today on board with internal antennas, motors external antennas, gps unit?
Could this be a gimbal issue or should the quad connect and stay connected regardless of gimbal even being connected?
Could I have fried the tx with wrong antennas?

Those with experience with these issues please chime in with

 

[Anewtoi]

An update on this post:
After purchasing a brand new gimbal, another used but fully functional gimbal a remote, and a crashed p3s that came with everything minus legs,props, and gimbal and changing everything into my bird I'm back in the air. Turns out the whole issue was ONLY my gimbal cable.
I tried my old pcb with a battery and the new gimbal and compass and gps connected and it works PERFECTLY!!! Well almost perfectly. I still have three motors to replace because I put the long screws in unknowingly. Now I'll have a spare for friends to fly alongside me.

 

[Anewtoi]

To recap: some symptoms of faulty gimbal flat cable include bird would flip between connection and no connection with the remote and simultaneously displaying "no image transmission" and "aircraft disconnected"
If you get these symptoms, try that first before anything else