Verify that the analog 3.5 mm audio cable is firmly inserted into the TV Connector and the audio source.
If the crackling persists, check the analog 3.5 mm audio cable for damage. If the cable is damaged it will need to be replaced. Contact your hearing healthcare professional for further assistance.
The TV Connector signal through the hearing aids may have a small noticeable delay. Adjust the audio delay of your television speakers in the audio settings menu of your TV.
For more information, consult the user guide included with your television.