Первичная диагностика iPhone 6.
After a third-party service, the client brought the iPhone to Bgacenter with a malfunction – it won’t turn on. The display module was replaced in the phone and after that the phone stopped turning on.
We performed initial diagnostics to identify the fault by connecting the phone to the lab power supply (LPS) and checking the Board for a short circuit. Short circuit in the Board is not revealed.
After that, the iPhone 6 was turned on by pressing the Power button (the phone is still connected to an external power source). The smartphone turned on, it became clear from the current consumption on the LPS ammeter. And at the same time the phone has a dark screen: no picture or backlight.
Then we connected test operable display module to the board, turned on the phone and flashed a light on the display. We saw the image on the screen.
This indicates that the backlight on the iPhone 6 board is faulty.