So you’ve got your antenna setup and plugged into the back of your television set only to find your auto scan not finding channels, or at least the channels you were expecting. If this is happening to you keep reading! In this article we are going to take a look at what the likely causes of this could be.
Mar 02, 2011 This video is will show you how to scan your LG tv for all the channels you can recieve from your antenna or your cable. Jun 06, 2013 My lg lcd tv recently stopped allowing me to access tv channels. I tried auto tuning and manual tuning and even bought a digital antenna to see if that helps but nothing has worked. Ive searched through all of my menu options and still it wont pick up any channels.
Why Is Auto Scan Not Finding Channels?
There could be several reasons why your auto scan is not finding channels. To start, let’s make sure that you are selecting the right input mode on your television set.
Typically, this will be found under your Menu –> Channels –> Auto Scan. Of course not all television set manufacture menus are the same, so yours may vary from this slightly. You can see in the image below that my TV refers to it as “Auto Channel Search”. If yours is called something different, simply consult your user manual to see the steps your are supposed to take to get here.
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Once you’re in the “Auto Scan” menu there should be an option to select either “Cable” or “Antenna”. Be sure you are choosing “Antenna” or some variation of this ( I have seen it listed as DTV). This will start the Auto Scan procedure.
If after the scanning process is complete your television auto scan not finding channels persists, it’s time to start troubleshooting. Here are some things we are going to need to check:
- Your TV Tuner is functional – it may be helpful to try a different TV if this is an option to ensure your TV’s digital tuner card is not the issue. This is as simple as plugging your coax cable into a different TV and running the auto scan on that.
- Your antenna cabling is not faulty – we need to make sure that you are getting a signal out of your coax cable. More on this later.
- Your antenna is properly aligned – obviously we will need to make sure your antenna is pointing in the direction of the broadcast towers in your area. Below will be some helpful tips to ensure this is the case.
- Your antenna has sufficient range – this is going to be another important piece of the puzzle to ensure you are able to pull in the appropriate over-the-air (OTA) signals in your area.
- Ensure proper noise mitigation – A noise margin greater than 0 is required at your tuner to display a channel on your TV set.
Let’s look a little closer at each one of these items to try to figure out why your auto scan not finding channels.
Check If You TV Tuner Is Functional
The first thing we should probably try to diagnose is whether your television sets TV Tuner is functioning. I should point out that if your television was made before 2009 it likely has an analog tuner in it. If so this is likely the reason for your television auto scan not finding channels.
If indeed your TV is pre-2009, you are going to need a converter box such as this inexpensive iDOO ATSC Analog-Digital Converter Box on Amazon. With this box you can conveniently convert the over-the-air (OTA) digital broadcast received from your antenna (not included) to your analog TV, digital TV, projector, computer monitor, smart TV, HDTV, LED TV, LCD monitor,etc.
Okay, assuming your television set was made in the last 10 years or so, you should have a digital tuner installed in your TV. That means it’s time to try something else. As mentioned, probably the easiest thing to try is to plug in the coax cable coming from your antenna into a different TV. Admittedly, this can be easier said than done, however, you can split your antenna signal using an Antenna TV Splitter to a room where you have another TV to try.
If plugging your antenna’s coax into another TV is not an option for you then you may want to look at investing in the KING SL1000 SureLock TV Antenna Signal Meter. This meter offers a fool-proof way to locate the strongest available TV signal(s) no matter where you are. If your TV antenna can receive the signal, the SureLock SL1000 can help you point your antenna to maximize it!
Check Your Antenna Cable Is Not Faulty
If the signal meter above is a little out of your price range or you happen to have a digital multi-meter hanging around your house, you can use it to check to see if you have a signal. Let’s do a check to ensure this is not the reason for your television auto scan not finding channels.
Just like any radio transmission your digital antenna receives radio signals that is transmitted via small electrical impulses to your television tuner. This means that you can use an electrical multi-meter to test whether or not a signal is traveling down your coax cable. If there is a problem with your cabling, such as a cut or short in the wire, this will cause the signal to be disrupted.
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In addition, if the antenna is not properly grounded, the signal can pick up interference from the electrical potential of the antenna itself. If you are interested in How To Properly Ground A TV Antenna, be sure to check out the article.
Let’s perform a couple of checks using your digital multi-meter to ensure your coax cable is good.
- Set your multi-meter to measure ohms, which is represented by the “Ω” symbol.
- Remove the antenna cable from your television set.
- Touch one lead of the multi-meter to the metal part of the connector and touch the other lead to the metal “core” or “stinger”. The ohm reading should be infinite.
- Now short one end of your antenna cables metal “core” or “stinger” to the coax connector. On the “un-shorted” end touch one lead on the “stinger” and the other lead on the coax connector. The ohm reading should be zero.
Rather see it in a video. Check out the YouTube video below that will walk you through how to test your antenna coax cable.
Make Sure Your Antenna Is Properly Aligned
Direction, direction, direction! Perhaps one of the most important aspects of any antenna installation. This could be the reason your television auto scan not finding channels. What you need to do is figure out which channels are available to you and in which direction the TV broadcast towers are located. You can use an online location tool such as TVFool.com or check out our very own TV Station Locatorpage.
This YouTube video will walk you through everything you need to know when using our tool. It will show you how to find TV stations available in your area and in which direction the TV towers are located.
You will need a compass or at least a smart-phone compass app. Once you use our TV Station Locator tool and have your bearings, head to your antenna and rotate it so it is aligned in the direction of your broadcast towers. If your antenna is on a roof you may want to have someone at your TV end to help with the fine tuning.
Alternatively, if you’ve been reading other articles on this site you will know that must “cord-cutting” enthusiasts rarely bring their antenna signal directly into their television set. Rather, they stream their antenna signals indirectly to their smart TVs, tablets, phones, Media Streaming boxes by way of a network tuner device.
The tuner devices I own can be purchased directly on Amazon and are called SiliconDust HDHomeRun EXTEND (2-Tuner) tuners. These devices are awesome!
If you get yourself one of these network tuners then your task of aligning for the best signal strength becomes much easier via one of the free smart-phone apps available on the Google Playstore. You can see in the image below I get real-time feedback of my antenna signal strength for a specific channel all while standing on my roof at the antenna…cool!
Check Your Antenna Has The Required Range
It’s important to understand that no one antenna or antenna type will deliver excellent TV reception in every location. The main factors determining reception are the distance and direction from the TV station transmitters to your home.
The transmitter’s power and the height of its tower also matter. This alone could be the reason for your auto scan not finding channels. Be sure to check out my article how high should you mount a TV antenna.
If you live within a few miles of the broadcast tower, and the signal path is relatively unobstructed, you may be able to get solid reception using a small indoor antenna. However, as you move farther away, getting usable signal strength becomes trickier. This is where careful antenna selection and installation become essential.
Auto Tuning Shop Cz
First, it’s probably a good idea to discuss the two broad categories of TV antennas that are out there so you can understand which category your specific antenna fits into. The two classes are omnidirectional and unidirectional, so let’s take a closer look at both.
OmniDirectional are antennas that will receive a signal from all directions because they offer a 360 degree field. So if you have one of these types of antennas there is really no need to “point it” in any specific direction. In this case if you are not getting the results you think you should be getting your only option is going to be to find a better location on your house or property.
If you’re in the market for a good omnidirectional antenna I highly recommend the Mohu Sky 60 TV Antenna.
UniDirectional antennas have a much narrower beam width, typically between 25 and 35 degrees. These types of antennas are much more resilient to noise and are ideal when your broadcast towers are clustered together in one general direction or area. It is important to note that TV signal transmission is “line of sight.” Getting reliable reception beyond the curvature of the earth (roughly 70 miles) is difficult. Mountains or tall buildings between the broadcast tower(s) and your home can also cause reception problems. So, the first step is to locate the transmitters for your local stations and point your antenna that way.
I personally use two unidirectional antennas in my setup. If you’re interested in checking out my current system check out this article The Best HDTV Antenna Setup Right Now. If you do, you will see that I am using the Channel Master CM-4228HD HDTV Antenna, I highly recommend this antenna for both affordability and quality.
Ensure Proper Noise Mitigation
The last thing I want to discuss is noise, the major causes of it and how to reduce or mitigate it. Any digital signal is going to be received by your antenna and ultimately your tuner with a finite amount of power. One of the easier ways to quantify this power is noise margin. The noise margin, given in decibels (dB), is the amount of signal noise allowable before the signal can no longer be received.
Noise can come from many sources, including any obstacles or interference encountered between your antenna and the broadcast tower. Other sources of noise can be that caused by splitters, the tuner you’re plugging into, and the coaxial cable itself.
This is why it is important to use high quality components and cabling. For splitters I recommend ANTOP Low-loss 3 Way Coaxial Splitter for TV Antenna or equivalent for its low-loss insertion. For coax cable you want to use a high quality RG6 such as Mediabridge Broadband Coaxial Cable.
Lg Tv Auto Tuning
Also, if the antenna is not properly grounded, the signal can pick up interference from the electrical potential of the antenna itself. If you are interested in How To Properly Ground A TV Antenna, be sure to check out the article.
Auto Tuning Video
Well I hope we’ve solved the reason for your television auto scan not finding channels. If you enjoyed this article, be sure to check out some of my other articles today:
And if you haven’t already done so, be sure to check out my Top 10 Antenna Picks for this year and leave me a comment!
She's got a Samsung UE40F6200 Smart LED TV.
She has a standard terrestrial aerial into the TV, length of aerial cable from wall to TV approx 2m.
The only other appliances connected to the TV are a DVD player via HDMI (plugged into HDMI 1 socket) and USB hard disk box (connected to USB socket).
TV initially tuned in ok; however when the DVD is switched on, it seems to 'knock' the tuned channels off - all the channels disappear. So she has to go back through the autotune process each time the DVD is used.
I've tried alternating the HDMI socket for the DVD from HDMI 1 to 2 to 3 and this doesn't fix the issue.
Just autotuned the channels again and it's only brought up 9 channels which makes me think it may be a signal strength issue; however not clear if there is a known problem with this model of TV and/or there's a workaround.
- #2Define channels disappear. Do you mean that when you call up the EPG or a channel list that it is completely empty with noting listed at all or that when you select a channel there is no picture and sound even though the channel name still appears in the list/EPG?
There is absolutely no reason why using the HDMI should wipe the tuning memory. However using poorly screened HDMI and especially aerial cables can be a problem if the two are in close proximity. There can be interference between the two cables that can affect reception of Freeview.
The cure is to use good quality cables and keep them separated from each other as much as possible.
Also if the tuning memory was not wiped (ie the channels were still listed) you should not have retuned until you had eliminated every other possible cause of the problem.
So first thing I would do is get a good quality well screened aerial cable and try that. Unplug the HDMI lead to avoid any possibility that it is causing interference. See if a retune now restores the channels. If it does DO NOT retune again!
If the tuning memory is getting wiped then that implies the TV is faulty as it should not be happening.
Unless of course it's not something silly like the TV is being switched to analogue mode which of course would show no channels.
- #3By 'channels disappearing' we mean that the channels that are stored by the TV get wiped ie there are no channels in the EPG.
We've tried a different TV and exactly the same thing happened - all stored channels get wiped from the EPG the minute the DVD player is switched on and the TV switches from Digital TV mode to HDMI DVD mode.
Which means it must be one of the following?
We're going to test all 3 of these individually/independently by swapping with other aerial/HDMI cables and another DVD player.
Still odd though that two TV's are having their stored EPG channels completely wiped the minute the DVD player comes on.
- #4There is no reason why that should be happening. There is no mechanism I can think of that would explain this.
It would be very unusual for two TVs to show the exact same fault, though by no means impossible. Though it would be less likely if the two TVs are different makes and models.
Are you absolutely certain that the TV is switching back to the digital tuner once the DVD is finished with? When switched to HDMI input it is entirely possible that you will get nothing showing in the EPG. Though on my LG telly I get a warning message to say that the EPG/channel list is only available in TV mode.
Or it is switching back to the analogue tuner for whatever reason. Which again would show nothing.
- #5Looks like HDMI cable. When we put DVD on and then back off, programmes stored are wiped.
However, then taking the HDMI cable from the DVD out of the TV input connection, the channels reappear.
Will get new HDMI cable and hopefully the problem will be solved.
Either buy it online so that if it turns out not to be the problem you can return it, no questions asked, or get one in Poundland on the basis that it's cheap and you have hardly anything to lose. All those I have bought have been from Poundland and I have had no trouble at all with them.Will get new HDMI cable and hopefully the problem will be solved.
- #7Consider replacing the cheap thin coax fly-lead with a proper hand-made double-screened version; as well as keeping the aerial cable as far from the hdmi cables as you can.
Cross-interference between the two is not unusual, but down to poor cable screening and/or proximity in 99/100 cases.
- #8I have experienced similar once before, the Hdmi cable effecting freeview reception when the aerial and hdmi cords were touching. But in my example, I replaced the aerial cord and that also fixed the problem.
Changing the cable probably won't make any difference.Looks like HDMI cable. When we put DVD on and then back off, programmes stored are wiped.
However, then taking the HDMI cable from the DVD out of the TV input connection, the channels reappear.
Will get new HDMI cable and hopefully the problem will be solved.
If there are no channels listed when the DVD is on and then they re-appear when the HDMI lead is removed then the channels are not being wiped. otherwise they would not re-appear unless you re-tuned.
As I posted above the reason is possibly that the TV is simply not switching back to the tuner from the HDMI input.Yanking the HDMI lead out kicks the telly into switching back.
There is probably a Source or Input button on the TV remote control, might have an icon of a square with an arrow across one edge pointing into the square. I would bet that if you press that a list of possible sources will appear and it says the TV is switched to the HDMI input. I would bet that if you changed it manually back to the tuner that the TV channels will re-appear.
You could try turning HDMI control off (different manufacturers call it different things) but that probably means having to change input manually all the time depending on what you want to watch.