@6233638:
As already mentioned by some people, your linked test-pattern does not work if your TV does 4:2:0 subsampling (4:2:0 and 4:4:4 looks identical).
I personally dont like test-patterns that can show you wrong results, so i would thank you if you add this information to your (old) post.
(even if only very old TVs are affected, we dont know how many people with a 4:2:0 TV are reading this thread
)