No sound fron our speakers

This doesn't sound like a TV Tuner PCI card. A PCI card is what goes into a computer and not TV. A TV Tuner PCI card will act like a TV and allow you to watch TV Air Channel on your computer.

Anyway, enough with the geek stuff. This seem to be a regular TV.

Simple trouble shooting:
1) Try the "Mute" button.
2) Try go into the speaker setting and see if the speaker been switch off. My stupid old Sony TV can switch off the speaker, don't ask me what the purpose for that function but it's under the menu.
3) Try turn up the volume to 1/4 of the way to max. (Max volume could cause problem to the amplifier inside the speaker and might cause problem to your ear too when it switch on)
4) Switch to the regular air channel see if you can hear anything. (Just make sure the media you are watching isn't input from something else like a VCR or the audio cable might not be plug in)


Goodluck.

PS: O, the best fix is to get new TV. I know it's obvious but sometime this is better then getting the old 1 fix.

Call a pro in to access your problem as you didnt leave enough info.. model and make of all you have and how is it all connected?

check your sound properties and make sure that your soundcard is your default playback device then you should get audio also if you have onboard sound disable it in your bios