Tablet Acer Iconia B1-A71 with faulty touchscreen

This video is about how to fix some of the bad contact problems in tablets, laptops, smartphones, or even tv and monitors.
It is not shown in this video when I cleaned the contacts, because I will make another video in the future about it.
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Видео Tablet Acer Iconia B1-A71 with faulty touchscreen канала Bob. Kalpon