Is the flashing black line at the bottom of the screen broken?

Q: What’s going on with this black line? The navigation bar is still not fully displayed after turning on the phone. Is the screen broken?

Editor: There is a high probability that the problem is with the screen cable. It is possible that the contact points are oxidized, resulting in poor contact. If you have strong hands-on skills, you can use a cotton swab dipped in alcohol to wipe the screen cable after disassembling it yourself. In short, it is the fault of the screen cable and the screen. reason.

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