My Charger 3 has white lines on display

[Xinmei]

I found recently my Charger 3 has several white lines on display, don't know why and how to resolve the problem? I did not broke it.

Moderator edit: updated subject for clarity

[EdsonFitbit]

Welcome to the Fitbit Community @Xinmei.

I'm sorry to hear that your Fitbit Charge 3 has several white lines on the display. Thank you for the information provided.

To try to resolve the issue, please restart your Tracker by following these instructions. 

Whether this doesn't work, please perform a long restart by doing the following:

1. Connect the device to the charging cable. 
2. While the device is plugged into the charging cable, press and hold the button down for 15 seconds. 
3. The device turns on and shows a battery icon. Two vibrations occur: first a short vibration, then a medium vibration. 
4. The device turns off.
5. The device turns on and shows a progress bar and short vibrations occur. The progress bar completes. Note: A total of 7 short vibrations occur. 
6. Remove the device from the charging cable. The device shuts down.
7. Important: Plug the device into the charging cable again.

If you have any question, please let us know.

[Xinmei]

I tried both methods, problem still exist. More helps are needed. Thank you!