u/Strict-Ask-4373

I recently got a pair of skyzone cobra x v4s and I have done all the necessary software stuff but they are still broken, nine times out of ten when I power on my (working and tested) air 75 the screen goes from grainy static to zigzag static and then black, But very occasionally they will connect perfectly and I will fly around and eventually they will disconnect again. It is nothing to do with the power supply as that works fine. I think it might be a loose ribbon cable or something similar. Is it difficult to fix myself and how? And if not are there services in the UK that fix this sort of thing? Thanks