Chosen Solution

I want to buy a burned iphone 7, a iphone that does not turn on the screen , whit the logic board burned and fix it. Can you tell me how can I check if I have not got iCloud phone? Besides, to check out the emei on the sim tray. What would be another solution? Please help me. Thank you and Sorry for my english. Update (10/07/2017) if i go to the apple service, they will able to help me?

Well. There isn’t really any other feasible way other than turning on the phone. Putting a sim card in and trying to activate it.