There may be several reasons why you can't connect to WiFi after changing your phone screen:
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1. Hotspot upper limit. After replacing the screen, the device may be restored to factory Settings, resulting in the number of currently connected WiFi hotspots reaching the upper limit. Try disconnecting other devices first, or resetting your WiFi router.
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2. Damaged or incompatible WiFi plate. In the process of replacing the screen, it is possible to accidentally damage the WiFi plate, or the replacement screen is incompatible with the original device, resulting in an inability to connect to WiFi. At this point, you need to change back to the original screen or replace the compatible WiFi plate.
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3. The system is faulty. After replacing the screen, there may be a software or system issue that prevents WiFi connection. You can try to update to the latest system version, or restore the device to factory Settings, clear all data and cache, reset Settings and connect to WiFi.
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If the above methods cannot solve the problem, it is recommended to send the equipment to the official after-sales service center for inspection and repair.
Well, then maybe someone messed with your phone's baseband