original’s backlight for the iPhone 7 is the part you need to replace if you notice marks on the screen against a white background or if the home button’s extension flex Cable is torn.
Replacement backlight for the iPhone 7.
This part needs replacing if you notice streaks on the screen against a white background; this is usually caused by moisture.
Since the iPhone 6S, the extension cable for the home button (flex Cable) runs through the backlight, so if the cable (flex Cable) controlling the home button is torn, you will need to replace this part to resolve the issue.
The repair involves desoldering the old component and soldering on the new one, so you’ll need a soldering iron and some basic experience.
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