want smart tv on an old 10 yr tv...easy.
Considering Maemo.org is the home to all us Macgyver's.... really .... take a look at the type of input the tv can take....hdmi....
or if the tv and pc will take this type of connections..
http://www.ebay.ca/itm/New-PC-VGA-to...item2348f4beac
or this...
http://www.ebay.ca/itm/6Ft-DVI-to-HD...item4877f8241e
or this...
http://www.ebay.ca/itm/10-FT-15-PIN-...item3a995c7a7c

It depends on what ports (specific) ports exist on your tv and what ones exist on your laptop / desktop.

For sound output...my suggestion is a headphone male connector(to pc headphone port) with female stereo Left and Right connector ends to output to your stereo. like this...
http://www.ebay.ca/itm/3-5mm-Stereo-...item51c9a3d2ea
and then use standard stereo connectors to your stereo system....
http://www.ebay.ca/itm/2-RCA-Male-to...item19e5a6a1d8

I have a lenovo t400 (and in a slight deviation ...a 3 tb external storage connected to the laptop ...filled to the brim with film and audio with my fav stuff stored on it...) with XBMC installed on the laptop sitting discreetly beside my 2 yr old 60" Sony and hooked up to my stereo.
And to enjoy sitting on the couch surfing...I use this..
http://www.ebay.ca/itm/3in1-Mini-2-4...item4d1b82ec53

Total cost was stupid minimal...less than $35 for the remote and cables...
Flat out kick-arse-nice setup.
I did my setup originally some 5 years ago...
got a bigger better tv in the meantime...
haven't used standard tv since....
Haven't looked back since
No way I could go back to cable or "normal" tv.
I get more channels...more programming on xbmc than ever I could any other method.