TV CHANNEL CODE

When you run a scan the TV changes to every channel and tries to tune in a station. that is why it takes so long. If your TV is only finding channel 4, I would guess that is the only station strong enough for it to pick-up. You should check and / or replace your antenna and or antenna cable. Then re-scan the channels. with a better antenna, it should find more stations.
Most older Tube type TVs need a converter to pick-up digital TV, if you have a converter, make sure it is plugged in.

You should not be getting any stations without a digital tuner TV or a converter box.

The FCC site says this:

The FCC established September 1, 2015 as the date for the termination of all analog low-power television service. Since that date, analog television should no longer exist in the United States. Until that time, LPTV stations were allowed to continue to operate their analog facilities.

What is the difference between a RF channel and a virtual channel? The RF channel is the channel that the TV station uses to broadcast its signal. Before the conversion to digital, TV stations were normally identified by their channel number, and most people knew that a particular network was on a specific TV channel. While analog broadcasting was being phased out and all TV stations were converting to digital broadcasting, it was necessary for the TV stations to continue to broadcast their analog signals on their original RF channels, and also broadcast their digital signals on a different RF channel. However, since the TV station used their broadcast channel as part of their identification, they wanted to keep using the same channel number. To allow this to happen, the new digital television broadcasting standards (ATSC) provided TV stations the ability to continue to use their original channel number and also tell the TV set to tune to the new RF broadcast channel when their virtual channel number was selected. The original channel number is called the virtual channel number, and it will be followed by a period and a second number (3.1, 7.1, etc.).
One of the benefits of converting to digital for the TV stations is that they now have the ability to transmit more than one program at the same time on the same RF channel. The number of additional channels they can broadcast is determined by the resolution of the program (SD vs. HD, text only, music only, etc.). The second number in their virtual channel number indicates that one of the additional programming sources from the same TV station is being viewed (10.2, 10.3, 10.4, etc.).
When selecting an antenna, it is important to understand the difference between the RF broadcast channel and the virtual channel. Antennas are designed to receive specific ranges of RF channels, and the antenna needs to be selected for the RF channel you wish to receive. TV stations broadcast in two broad frequency ranges, called VHF and UHF. RF channels 2 through 13 are considered VHF, and RF channels 14 through 51 are considered UHF. In order to pick up the channels, the antenna has to be designed for the correct frequency range. It is very common today to find that TV stations using virtual channels 2 through 13 are actually using RF broadcast channels in the UHF range. Although not as common, some TV stations using virtual channels 14 through 51 are actually transmitting in the VHF range. An antenna designed for only UHF channels will not work effectively for RF broadcast channels in the VHF range, and an antenna designed for only VHF channels will not work effectively for RF broadcast channels in the UHF range.

Check the settings to see if it is locked on channel 3 for external tuner source to have an input from a cable box ant in that needs 3 to function or from some other externally decoded signal like a vcr. Does the TV have a Digital tuner or the old analog tuner? If it's digital you can hook up a rabbit ear antenna with the UHF output on it & should be able to tune in some stations. If it's the old style then you will need a converter box to get it to receive any stations.
Fist check the settings to see if it has it set to lock on channel 3 for external tuner source.

If you try another TV does it pick up more stations?

you can still change the channel through your TV's control

Try 1-800-Remotes Factory original.To buy an original remote.

Are you connected to a digtal converter or just a digital antenna? If only to an antenna then yes you will most likely pick up one or two low power UHF stations that are still able to broadcast in analog.

Turn the tv on. Hook up your components, turn them on, go in to tv menu and auto program the stations. It will see that there is a signal on channel 3 and lock it in for you.

I just purchased one of these televisions and it didn't come with a remote. However, a Philips Universal Remote (SRU2103/27)
with a code 0520 works fine. I haven't explored all the codes but I can easily change from tv stations to Video 1 and Video 2 merely by pressing the "Input" button on the remote.

What you need to do is take the remote, go into the menu, find channel scan and do a channel scan to find all the available stations available on this system. Make sure the TV set is in the cable mode and not antenna mode or you wont get any stations above channel 13.