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How do I repair a nonresponsive capacitive touch screen on a tablet?

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If the whole digitizer does not work at all, then typically there is a flex ribbon cable that connects it to the main PCB of the unit.

In some devices the ribbon is plugged into an edge connector internally, so just unplugging/replugging it makes it work.

Knowing how cheap these devices are, they probably use conductive adhesive, and it's dried up and cracked. A little touch up soldering and/or conductive ink/glue and you may be able to fix it. Sometimes the ribbon cable itself has failed, so a dab of conductive paint 'may' fix that.