I have just found a TV with those led strips. They are from 'LED backlit TVs'.
Same deal, I don:'t know the voltage yet.
Each individual led is probably under 5 volts, its just how they connect them up, inline or such.

I have been making tiny torches from 3volt motherboard battery clips and a led. Also 9v battery and battery clip offa a old 9v battery and LEDs.
Down to a AAAA battery (yes they do make them!!!) Out of a alkaline 9v battery, there's 6 of them and a solar lights 1.5v white LED.