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Flat panel TV (DLP, LCD, LED or HDTV) are digital already.
Your signal inout could be Analog or Digital.
Also STB (Set of Box) or Cable or OTA (over the Air channels) determine if your input signals are Digital or Analog.\
You are not stating what type of TV you have. If it is an older CRT or even some older LCD flat screens, it may only have an analog tuner. All TV stations today are broadcasting digital signals and if you do not have a digital tuner in the set, you will need an adapter box to use an antenna with the set. They were widely sold around the time of the analog-to-digital transition, but are harder to find anymore.
U want free air DTV?Yes,have a good Digital antena or a roof antena hood up to ur tv.Goto the tv menu.Goto SETUP go down to Ch.setup enter and pick AIR not CABLE.Enter it again for scanning for DTV free air channels.After done the scanning u should have all the free DTV free air channels.
Firstverify that the direct TV satellite box is set to receive and display digital stations. If you old set on the sat was analog, the box may not have been reset. You may have to contact you satellite provider. Next you will have to go to the TV menu and auto program/scan in the stations. This should pick up all the stations.
I bought the 32 inch LCD tv. I contacted Sharp. Here is there response.
Thank you for contacting Sharp Electronics Corporation.
The display will populate on screen any time there is a change to the incoming signal (mono to stereo audio, weak/fluctuating signal strength). Unfortunately there is no way to deactivate the on screen display. If you are able, try using an alternate connection (composite video and analog audio; yellow, red and white cables) from your source device (cable/sat box, if using) to the unit. This will prevent this issue from occurring by providing a more consistent signal. Let me know if you have any other questions!