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This happened to me, as well. The unit still functioned and reported data as designed, but the display had multiple lines across it. Rebooting the device did not help. I replaced mine.
Sorry, there was a problem. Please try again later.You can first reset the watch: https://community.fitbit.com/t5/Charge-3/Charge-3-screen-went-blank/td-p/3094616 If you stilll have the problem, you can contact Fitbit customer support: https://help.fitbit.com/?l=en_US&cu=1&fs=ContactUs
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