If the original screen also doesn't show the backlight, then the backlight circuit is blown. If the original screen has the backlight on, then the replacement screen has an issue. You can connect the original, cracked screen to confirm this. If you can’t see an image at all, then it may be the LCD circuit that is damaged. If you can see a dim image, then the backlight circuit has been damaged. Then shine a bright flashlight on the screen. To test for this, plug your device into a charger or an iTunes enabled computer. Either way, this type of repair requires micro-soldering and isn’t really a DIY repair. If you’re lucky, then only a backlight filter is damaged but other times, the entire circuit could be affected. 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 can’t see an image at all, then it may be the LCD circuit that is damaged. Follow these steps to force restart your iPhone to fix the issue: For iPhone 7/7 Plus and above: Press and hold the power and volume button for a few seconds. the backlight is ~20V) and ground in very close proximity. Fix 2 - Force Restart iPhone 8/8 Plus: Press and quickly release the Volume Up button > Press and quickly release the Volume Down button > Press. To test for this, plug your device into a charger or an iTunes enabled computer. Its done so four days out of seven the last week. you can see the backlight, but there is no picture. help ive had my iphone for about a year now, and the last week the screen has had its own life. The issue is that the LCD connector has pins that have high voltages (i.e. my screen lights up but there is no picture. It’s very important to always disconnect the battery before disconnecting/reconnecting the screen assembly.
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