TV & Home Theater

[arpit8]

Hey, 

I really need some Help here. I bought this TV in December 26th. From bb. TV was making some static noise. So I exchanged it within 14 days. When I was getting exchange on TV REP at Best buy at woodbrigh(one at hwy 7 and western)  Ontario said. it's common for LED TV to make that kind of sound for first 100 hours or so. I believed him and got new TV with same issue.. When Geek squad came to mount the TV they heard the Static noise they called Store manger and told him that TV is not proper now I was over by 4 days of my exchange or return policy. Manager was nice enough to exchange it for me again. Now I have 3rd TV with same issue... (LAst two TV were open box). I have updated my Software ver to 04.02.28

http://www.lg.com/us/tvs/lg-42LV5400-led-tv

Please HELP

[D65k]

set the output of the cable box to native or 480i/480p.