-I repaired TV.

- All turkish channels work.

- I am a good workman(Can I say Ben iyi bir usta?)

Thanks in advance

Hopefully someone with stronger Turkish can check, but you should be OK with this:

-I repaired the TV.

Televizyonu tamir ettim.

- All turkish channels work.

Her Türk kanalı çalışıyor.

- I am a good workman(Can I say Ben iyi bir usta?)

very close - Ben iyi bir ustayım.

işçiyim might be better

Everything else is perfect

Thank you both.Can I also say ´Bütün Türk kanallari calışıyor´?Or tüm kanalları?

Bütün/tüm is better than her here- in this sentence

Why?

Because Bütün and tüm has same meaning. 

Haha, funny, you are right, I should be specific. I meant why are bütün and tüm better than her?

in this exemple tüm/ bütün means all

and her means every

Thanks Elena, well in that case her seems to be better, because "all Turkish channels" actually means "every Turkish channel" and not "the whole Turkish channel".

I´m sorry I´m not trying to be a nerd.

(I just am hahahaha)