i found another way to find my TV: using "add device":
and boom! enter WPS PIN:
Ok. Quick look into LG manual: nothing.
Googleing the internet: default PIN code of the TV is "0000" (but nothing about WPS, beacause there is no WPS button on the TV)
enter 0000: doesn't work
changed to 1234 in the TV settings end reentering: doesn't work
The distance between PC and TV is two meters.
I also tried to search fo WiDi device on the TV and i found my PC. After trying to push "pair" button on the TV it said that "Confirm this on a popup massage on your device". Guess what. I never saw this popup on my PC.
This is becoming an interesting quest