Backlight only works during startup

I recently changed the screen on a Xiaomi Mi A2 Lite. When I start the phone up, the Android One logo displays with full brightness and colour without any issues.

The problem is that once the phone turns on there is no backlight. You can still see the display if you are in a dark room and everything seems to show correctly. I have tried updating and factory resetting but still having the same problem.

Any advice would be much appreciated.

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