Here's a challenge for you then - get a ruler with metric graduations and a small stick.
Hold the stand to the TV set and poke the small stick up the hole - measure how far the stick goes in - this will give you the length of the screw - take a bit off because you will not want the screw to be too long for the hole. 15 mm 20 mm 25 mm the stick and the ruler will tell you which...
Use the ruler to measure the diameter of the screw hole - my guess is that it'll be an 8 mm thread.
You can then buy screws... in the form - Head - Diameter - Length- as in - Pan Head - Pozi Drive - M 8 x 25 mm long for instance'
Alternatively you could wait a long time for somebody who has the same set as yours - to take time out to measure the screws they have and give a definitive answer on here - could be weeks - months - best to measure for them I think.
Good luck...
December 2014