How to replace backlight?
How do I replace Iphone 6 Backlight? Do i have to buy a new logic board if so any cheap good quality?
It’s very important to always disconnect the battery before disconnecting/reconnecting the screen assembly. The issue is that the LCD connector has pins that have high voltages (i.e. the backlight is ~20V) and ground in very close proximity. When you fumble around trying to line up the connector plug to the receptacle, you can short out the voltage rail and cause damage to the components in the backlight circuit. If you’re lucky, then only a backlight filter is damaged but other times, the entire circuit could be affected. Either way, this type of repair requires micro-soldering and isn’t really a DIY repair.
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.
You can connect the original, cracked screen to confirm this. If the original screen has the backlight on, then the replacement screen has an issue. If the original screen also doesn't show the backlight, then the backlight circuit is blown.
If iTunes doesn’t recognized the device than the problem is more than just a screen or backlight issue.
You don’t typically replace the backlight on an iPhone 6. The logic board doesn’t need to be changed to repair the screen either, unless you have water damaged the board. You simply replace the screen entirely on the phone by ordering one of the ifixit kits on this website and following the instructions here.
Or you can take it to a nice reputable local repair shop.
Sarmid n could be your new display. Anything is possible. It will help to know why you changed the screen in the first place and if you disconnected the battery before doing any repair on your phone. Common failure are the backlight filters.
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