Lumia 550 doesn't want to turn on/charge. Need to recover the files

Hello guys,

*First I don’t know why but in the search there is no model number 550. Maybe iFixit needs to add it to the database. So I selected the closest one - 535.

I am having some issue with the Microsoft Lumia 550. It doesn’t want to charge up and to turn on. I readed on internet that they are many guys with the same problem and nobody found a solution for that. After a drop the screen has been dead and I replaced it with a new one and it does not turn on. Only vibrates for a second and thats all. He doesn’t want to charge. I was thinking that it’s from the battery and ordered a new one but still the same issue. Nothing found on internet. I don’t know if the problem is from some chip or the usb port. Any suggestions? The phone is not important but the files inside it are. If there is a way to recover only the files from the phone will be great. If I orded a second had motherboard is it possible to replace the chip which contains the files to the new motherboard? And if yes is it hard and which chip is it?

Thanks in advance.