How do I replace my backlight?

after changing my back glass i cannot turn on my backlight i even tried restarting and force restarting it, and tried it on the camera app but it still doesn't work

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To be clear you are talking about what most people call the flash to fill-in light for the camera at close distances, or used as a light to see by.

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just replace only back glass, also replace the Magsafe Magnet Ring?

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I think her issue is the flash, and the back glass was replaced already.

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