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You must have a UHF / VHF antenna connected to the antenna input of the TV to scan for digital channels. Most new TV's have a threaded, round 75 ohm coax cable connection for this - but yours might even have connection consisting of 2 small screws to connect a 300 ohm twin lead antenna cable instead. Use which ever yours has.
If you are using this input for the input of a cable TV "set top box" (STB), satellite STB, or similar, you will likely only find a single analog channel (Ch3 or Ch4) after a scan as the scan will only find the output of the STB - which is usually on Ch3 or Ch4 - and not be able to scan the STB channels.
Additionally, the antenna input of the TV will only provide a standard definition picture if connected via coax cable from the STB. It will only provide a high definition picture if connected to a UHF / VHF antenna anda broadcaster is close enough for its signal to be received by the antenna. The way to obtain the best possible picture (high definition) when using an STB for tuning channels is to use an HDMI cable between the STB and TV. An HDMI cable will provide the very best picture and audio signals from the STB to the TV; all over a single cable and is the recommended practice.
Thanks for the answers and explanations. I'm going to purchase a Linux STB on switchonshop and now I'm trying to figure out all the things concerning TV boxes, applications, installation. It's not that difficult as far as I understand but still I have to pay attention to many aspects.
Thanks for Using FixYa. If its a 4:3 normal TV or a wide 16:9 TV then you can view high definition picture by using the ARC button on your remote control to change the wide mode(Auto,Letter Box, Pan & Scan). Also check its free user manual for more information.
Got you some help!! Open receiver up...Locate the power supply board. Locate the electrolytic capicitor "C118" and replace. II've fixed multiple LG LST 3100a receiver doing this procedure. Guaranteed to work. I hope you have not throw it away. Cheers!!!!
cap-grant, my friend has the same problem with set top box. When I phone maker I was told it is due to poor and weak signal. You must have 80% signal strength to maintain good picture. When signal strength dropped picture would freeze and had to be turned off at the power point to restart as nothing would work. So I guess what my experience says is you may need better aerial to boost signal and prevent dropout Leonard210