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Either the screen display cable has become disconnected, or the display has failed and will need to be replaced.
The back will need to be removed to proceed with this repair.
If you don't wish to remove the back cover yourself, then a local phone or electronics repair company can carry out the repair for you. Alternatively, you can return the phone to Tracfone.
Let me know if you need any further information.
Please tell me what else you require?