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Step 2: host separation. This step is a bit confusing. Because the ipad is so smart, the wires are very thin. If you don't know the method of plugging and unplugging, you probably can't break the so-called line. I carefully studied all kinds of pictures and slow-playing videos on the Internet, and finally figured out the principle and successfully separated the screen from the host.
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Step 3: Take out the battery. When I was ready to remove the battery for replacement, I found that it was not that simple, because replacing the battery required removing almost all the components, including the motherboard. What is even more shocking is that Apple is worried that the strength of the connection between the battery and the back case is not enough (there are several holes), so it sticks the battery to the aluminum case and finally takes it off after hard work.