Digital tuner with macintosh tv

Hi,

I'd like to buy on ebay a macintosh tv but i live in france, and there's no analog tv anymore...

Is there some way to convert the digital signal from the plug to an analog one without using those stupid aftermarket digital tv tuners?

(i know it's possible with digital sound: I have an optical to RCA adaptor)

If not, can I replace the tv tuner in the old macintosh?

Thanks