Bought one of these yesterday for bedroom. Took it out of box. Hooked it up directly to cable (no box) and ran the Auto Channel Scan (selected Cable). It shows it found 90+ channels, then shows Please Wait and then goes black. Try to use up/down arrows to change channel and nothing. Nothing is on the channel list either. However if you manually type a channel (like 3 enter) it will then show the station and it will now have that channel on your channel listing. Help, don't want to manually type in every channel. 
Also, checked parental controls and it is off.
Excuse me but the other answers are written by people who have not actually confronted the problem and are just guessing. They are all wrong. Here's the answer:
If your TV is expecting a TV input, it will keep searching for at least one TV channel on cable or antenna. If you only have a DVD player plugged in, for example, or if your cable is hooked up wrong, so there's no video signal on it, the TV will keep searching forever. (This is an unforgivable design flaw, by the way. But then, it was a cheap TV, wasn't it?)
To solve the problem, look at your remote control. You will find input buttons. Mine are small, along the top, right under the "power" button. Try pressing "video" for example, instead of TV. That stops the TV from hunting for TV channels.
Have a merry Christmas. Enjoy your new TV. Watch it in moderation and eat fruit and vegetables every day.
It's Timbo again.
Now that I've owned this thing for awhile, it's more familiar. The basic problem is changing the signal input, also known as signal source. If you use the TV only for DVDs or video games you might not have a TV signal source (cable box, satellite box, or antenna) connected. If the signal source is set to "TV" it will scan for TV channels forever, without giving you any helpful information about what's going on. This is definitely user-hostile design. You can change the "input" with the buttons on your remote control, as I mentioned before. Or, you can make the necessary change using the confusing array of buttons on the lower left side of the TV. Click on the "Input" button. Then use one of the channel buttons to scroll through the menu displayed on the screen. Choose the input source you want. For DVDs, video games, etc. that might be "AV1" Any source other than "TV" will make it stop scanning for channels. When you've chosen the input you want, click on the "input" button again to confirm.
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Select Input, and choose your input. Mine is component.
I don't have a solution but I have a similar problem. I am using my Dynex with an antennae. It used to find 20 channels in my NY apartment. The suddenly it lost most of them and rescanning doesn't bring them back. In fact it scans well through the analog spectrum and then creeps along for 20 minutes or more finding just 4 or 6 digital channels. I suspect the software is corrupted. Does any one know a diagnosis or even better a solution?
Buy and American made television rather than an off brand and then go celebrate with a Jack and coke...
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What happens when you press 3-1 then enter? Or 3-2 or 3-3?
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