Chosen Solution
Hi, Just got an iPhone 6 from my uncle, it has no backlight, he told me if I can fix it I can keep it. My two options are, replace the whole motherboard or replace the display. I don’t know which one is broken. I have no way of testing the display in another phone, but I do have a multimeter. Could some one help me out? How could I find out which one is faulty? The screen has some brownish tint at the top and bottom, where the backlight leds are, could be an indication? Thanks!
To test for this, plug your device into a charger or an iTunes enabled computer. Then shine a bright flashlight on the screen. If you can see a dim image, then the backlight circuit has been damaged. If you can’t see an image at all, then it may be the LCD circuit that is damaged. There’s no easy way to measure the voltages when the screen is connected because the connector obscures the test points. You could check the backlight filters to see if they are damaged but if the screen has a brownish tint, that would be a good clue that the screen is the issue. Ideally, you need access to a good quality or known-good replacement screen in order to do a proper troubleshooting. A micro-soldering repair will be less expensive than buying a logic board.
