Chosen Solution
does not turn on, sees a dimly lit screen, and then i turn charger, he sometimes vibrate. No apple logo. Maybe battery dead because i change screan after 3 weaks. Thanks
Try another display. If the ambient light sensor isn’t connected or damaged it will default to a dim brightness if auto brightness is enabled. If a new display doesn’t fix it, you could’ve damaged the back light circuit if you didn’t disconnect the battery.