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This can be for any number of reasons including weak signals from those stations, a poor antenna, or a defective tuner in the receiver.
Without more information I can't even make a guess as to which one is your problem.
Just because you used to be able to get some stations before they went digital it does not mean you will be able to receive them with the same antenna and a new digital tuner. This has been written by many people besides me on a number of DTV web sites. My blog about antennas is at SolidSignal.com, my blog article links page on my web site is at: http://cs.yrex.com/ke3fl/KarrasCorner.htm
first of all, make sure all your connections are secure and threaded all the way in. Next, go to the main menu and press 5 (configuration) and press 1 (search for channels) if this doesn't work, press 4(signal strength meter) and see how strong your signal is. You may just need to re-position your antennae. If all else fails try system reset(number 5) and repeat search for channels. I've had similiar experiences with mine but I have a 62% signal strength and still get 20-something channels. Hope this helps.
I don't know in what area you live & therefore how strong your reception area will be, but as a general rule an indoor antenna is never the best type of aerial to have to receive digital signals, you will always find that you pick up some good strong channels but more often the rest of the channels will be poor or non-existant & will constantly break-up/freeze etc. The best advice would be to try & fit an outdoor antenna if possible.
if you can access tv menu go to settings that show source(antenna/cable)highlight cable setting and hit search/program ;tv should go through all the channels and scan them into memory. it just might be that it is still under antenna setting .try solution ,it might be what's wrong.
I install at least 2-3 antennas a week. While Analog stations were no big deal when it came to reception, Digital signals are very directional, and can be very fickle about reception sometimes. Digital is "all or nothing," meaning that if you get enough signal to get a picture, then great, but if you don't, it won't allow you to even try to make the picture.
My suggestion is to first try a 15-25 dB amplifier (with an FM trap) on the antenna. Use it first in-line, immediately following the antenna, before it is fed to any TV's. If that doesn't help, try re-aiming the antenna directly toward the city from which your signals are being broadcast. You'd be suprised how little you have to turn it to make a big difference.
Give these two things a shot. Hope this helps you...
I have found that with an ordinary antenna connected to the converter box it can receive nearly all channels, however I have run into cases where I had to use an amplified TV antenna to pick up signals. I have started telling folks that when they install their converter boxes to try to use the plain old rabbit ears antenna, but if that does not work, use an amplified antenna, and that usually does the trick.