Şafak Karabal

I got a 55UH77. I got a problem with my Antenna Channels. When they come to setup our TV, they filled all channel slots and a lot of channel were duplicated. I wonder if there is a way to clean them automatically. Because there is a lot of channels and TV lagging when changing channels, searching channels etc. I dont wanna delete/edit channels one by one... Because there is like 1500 channels or something. I dont have time to do this