Hi gulfmiss,
It will likely depend on the version of the ReSound Hearing aids you have purchased. If they are Bluetooth-enabled, you can connect wirelessly to the U7900 TV. To do so, refer to your headphone's user manual for how to pair. Once paired to the TV, go to: Home > left directional key Settings > All Settings > Sound > Sound Output > Bluetooth Speaker List.
You can also call us at 1-800-SAMSUNG, 8AM - 12AM EST, 7 days a week.
~Samsung Advisor