Decals not showing when I click on a button , how to fix it ?

Hello ,

I have a problem , I have a script where , it supposed to put a decal on the brick that I want , but the problem is that , when I do this , my decals doesn't show up .

function Check()
if script.Parent.Power.Value == true then
game.Workspace.TV.Decal.Texture = "http://www.roblox.com/asset/?id=82074368" 
wait(0.1)
end
end


while true do
Check()
wait(0)
end

It's accepted , but it just doesn't show up