"How to I test the Tristar?"に関する回答We recently made a post about using a multi-meter to get a 100% accurate test of the tristar status of good or bad see here: https://www.microsolderingrepairs.com/bl...
"New Screen and keys not working"に関する回答As others mentioned I would try a new screen first, but then also try cleaning out the digitizer connection with some canned air to make sure all the pins have good contact.
"iPhone 6s screen repair "Non-OEM Hardware Detected" during restore"に関する回答**Update** I have tested with an iphone 6s restored to ios 9.2 via itunes and it works fine. no errors or pop-ups. Not an issue! I used a non oem replacement screen during the whole restore.