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I need any advise I can get. So I replaced the battery on my iphone 8 I did everything by the book connected everything back up powered the phone on and the screen isnt turning on but the phone is. Have I by any chance damaged the inside of the phone where the screen connects or would it be the screen itself? Thank you
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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.
If iTunes doesn’t recognized the device than the problem is more than just a screen or backlight issue.
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Thank you very much highly appreciated if the backlight circuit is damaged what is the repair ? And if the LCD circuit is damaged what is the repair? The phone still turns on it's just no image on the screen? Also I havnt tried a hard reset would that possibly fix it? Also would putting a new screen on fix the problem ?
If either/or circuit has failed, it will require a micro-soldering repair and is not DIY.
I can see small parts of the screen with the flashlight
Would it be there backlight in the screen or the board?
The backlight is built into the Screen Assembly. The backlight circuit is on the logic board. If you installed the replacement screen with the battery connected, odds are that the circuit is blown.
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.
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