Makes and model numbers would help.
If the speakers are not self powered you will probably need an amp but if your TV has a headphone jack that will give you some sound but limited volume.
If they are self powered but your TV doesn't have the right kind of audio output then you will need a converter. Maybe a DAC like this one.
http
/www.parts-express.com/parts-express-dac-digital-to-analog-converter-(51-compatible)--180-999