After doing a factory reset on my TV it started to work. Then, when I did all my general settings on the TV it stopped working. So I decided to do all settings step by step and it turns out that when I set my TV's "ENEGERY SAVING" to HIGH (because I don't want it too bright in my bedroom) then it disables the IR on my RPi. Probably because it's gaining noise on HDMI? I don't know.
Anyway, I'm glad I solved this. Thanks for all reactions.
