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オリジナル投稿者: albiejames ,



Based on your description, it sounds like water has seeped into the light box of your screen. Cleaning out the light box without leaving behind any traces of dust or isopropyl alcohol marks isn't easy so I suggest replacing the light box and cleaning the back of the LCD as well with isopropyl alcohol and a microfiber cloth. Removing the light box however requires solder work on the connector itself but its not difficult in my opinion.

Here's a youtube video demonstrating a light box replacement on an iPhone 5 screen. Same concept for the 5S. It can save you money if you have the soldering skills to do it.

Best of luck