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My iphone 6s has a new screen and battery. When it was given back to me in the shop, it was working but within seconds the screen went blank and has never turned back on since. And advice would be useful before i pay for more repairs that dont resolve my problem. Will I lose all information on the phone if a new logic board is installed?

Why should you pay for any additional repairs. You brought your phone into the shop to have a screen replaced and it failed within the hour. Go back to the shop and have the phone looked at again. The screen they used may be defective (it happens some times) and it should be covered under their warranty. That’s why it’s important to go to reputable shops.

first of all. plug the iPhone to PC. check if it’s recognized by iTunes. if iTunes can see it then download itools to your PC. and see if there is display from the mirror in itools. work around the iPhone screen if the touch is responding. let us know after that.