The display doesn’t show. I can infer that the touch is operable on it due to sounds and vibrations. I replaced an old cracked screen with what appears to be a genuine apple replacement screen. I’ve done this before with other phones of the same model and it doesn’t do it then. Maybe the connectors on the motherboard aren’t good anymore? I hope not, that’s incredibly hard to fix.
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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.
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Are you sure you mean shine a flashlight on it? wouldn't that dim the image more?
If the backlight is defective, shining a bright light and looking at the screen at an angle will allow you to see a dim image.
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It sounds like the screen is defective. You could try reseating that LCD Assembly you purchased, just in case it isn’t fully seated onto it’s connector on the board. Edit: Can you return said screen for another one?
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no, I bought it on eBay, and they don't have returns
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Hello,
You can fix this error by reboot your device and sometime charging solving this issue too.
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