Hi to everybody. I want to buy a galaxy tab s7 with black screen issue, screen is not broken, no any visual damage, its cost around 110usd. But before i want to ask maybe somebody know what can be the problem and how much repair can cost to me. Seller telling that problems just appears for no reason, screen sometimes become black, but tablet still working there is system sounds etc. He told me also that some times image come back, sometimes is not working, as i understand mostly its not working. I watch few videos in Youtube and also read few topics in internet and its look like allot of problems with LCD cable, that its just need to reconnect. But i watch also in ALex  video with Galaxy s7 and it was the same problem with phone, but problem was not in the cable. So the question maybe somebody faced with this problem or have some minds what can be cause of the problem i will appreciate all your replies, i want to know the worst case what can be. 

Thanks to all