When you turn off the digital television receiver, the channels disappear. Why the set-top box for digital television dvb-t2 does not find TV channels
Probably, every person has encountered the failure of one or another equipment, and recently the situation is relevant when digital television does not work. A person turns on the TV to watch a long-awaited continuation of a series or a favorite show, but only gets a blank screen. But digital television does not work every time for some reason that no one understands. Either there is no broadcast, or the signal does not pass through, or prevention is carried out on separate channels. Digital television also does not work if the antenna or even the TV itself breaks down, or maybe the cable comes loose somewhere. There are many, many reasons why there is no television broadcasting. This article will help you understand some of them.
Main reasons
If digital television does not work due to lack of signal, it will be immediately clear, because not a single channel will respond. This means something happened to the antenna. Prevention cannot take place on all channels at once, most often on just one or, in extreme cases, on several. The rest will work, and why digital television does not work is not a question for such a situation. If a cable has come loose somewhere, then the question is legitimate, because silence and a dark screen will be everywhere.
The first thing you can check is that everyone knows, even people far from technology. You need to disconnect and reconnect the cable. If it doesn’t help, then contact specialists and ask them why digital television doesn’t work today. If the user suspects that the TV is broken, there is no point in taking independent action. Only a service center or a private technician who knows how to repair TVs will help.
Much, much if
Cable TV users have the opportunity to immediately contact the company that provides broadcast services as soon as they discover a lack of sound and picture. There are usually specialists there, they will always help in all cases. If there is no cable television, then first you need to get to know your neighbors and ask if everything is okay with them.
If their digital television has not stopped working, then all problems need to be looked for with a specific user. If a regular indoor antenna is used, problems usually arise frequently, so many people now purchase special amplifiers, then there is no answer to why digital television does not work. An antenna amplifier is a very effective aid, and it is not difficult to purchase - it is not too expensive and is sold everywhere, in every household appliance store.
Common problems
Satellite television antennas are very powerful, but even they sometimes refuse to transmit a signal, and a frustrated user spends a lot of time with the phone in his hands, asking the broadcasting company why digital television is not working today. This problem is considered common. The satellite is moving, and it was to it that the antenna was tuned, and it was from it that it caught the signal.
It exists, but is not available. The problem can be solved quite simply, but not every user can independently reconfigure the antenna to another satellite, so it is better to immediately contact specialists. Moreover, it is not a fact that the satellite has moved. The antenna may also change its position due to the wind or because an object, such as a tree branch, falls on it.
About the benefits and harms of curiosity
There are many reasons, and users have even more solutions, unless, of course, they cannot correctly determine the reason why digital television is not working well. If the cause is unclear or the user made a mistake in the diagnosis, additional problems may arise when acting independently. Therefore, it is better to resort to the help of real professionals. They will determine why 20 digital television channels do not work, or, for example, only ten out of twenty work.
A user who is not very well versed in modern technology is unlikely to be able to do this. But there are (and in fairly large numbers) inquisitive people, and it is their choice: to establish a signal or to break something else. You can only eliminate some minor defects on your own, and those that are visible, for example, placing the cable correctly in the socket or choosing an amplifier for the antenna in a store. The rest needs to be left to specialists.
Far and near
In the city it is much easier to get answers to the following questions: why digital television channels do not work, why there is poor sound and image reception, why not all channels work well, and many more questions regarding broadcasting and reception. But very often there are situations when it is difficult to solve such problems even in a metropolis. It is impossible to even list all the cases in which even a master cannot immediately cope if digital television does not work.
Kaluga, for example, is a very modern city, but for some reason there are a lot of reviews on the Internet about signal problems from there. City residents generally have much less problems calling technical support, but how much more difficult it is to resolve issues of this nature far from civilization! In the outback, time does not flow so quickly; modern technologies arrive there very late or never arrive at all. Therefore, fans of digital television need to find out what options exist for them today.
Three options
Firstly, this is cable television, when the signal will be distributed directly through the television cable, and it is connected to a separate TV. This is a very high-quality transmission, but it is not available in every outback, mainly in cities. And the subscription fee is quite high.
Secondly, this is satellite television, when the signal comes from low-Earth orbit and is received by an individual antenna (“dish”). This can be done everywhere, and the sound and picture will be of high quality. The subscription fee is quite high, and the equipment is also expensive. And from time to time, the user still asks the question: why did digital television stop working?
Thirdly, terrestrial, when the signal is distributed by ground-based repeater stations and is received by an individual antenna. There are few costs here, but the signal level is much lower, the quality of reception depends on everything in the world - here is the weather, and the distance from the relay tower, and the height of the antenna mast, and much, much more. And every user will be in a bad mood from time to time due to the fact that terrestrial digital television does not work.
Of course, nowadays, everywhere, everyone and always is helped out by the Internet, where you can always watch whatever you want. However, this article is not about these cases.
Theory
All these methods are quite good. But when choosing one of them, it is necessary to imagine at least in general terms how they differ. For example, terrestrial television and digital television are completely different. The latter is that digital coding is used to transmit image and sound - both the audio signal and the video signal. And digital channels are used for transmission. Such encoding ensures minimal losses during signal delivery, since there is no danger of any interference with the encoded information. And if digital television channels do not work, then they do not work completely, at all. And if they work, then only in excellent quality. There is no borderline state or interference here. The only exception is that the connection quality is poor. Then the TV seems to slow down, turn off and turn on again. And this can only be corrected in one way - you need another antenna or the existing one needs to be raised higher and turned towards the TV tower.
It should also be noted that many users do not know that digital television is always limited in the number of available channels. Depending on the region there may be ten, twenty, the number varies. The principle does not work here: raise the antenna higher and catch absolutely everything. No, only what is available can be configured. For good viewing, you need, first of all, to purchase a television antenna, a television or television that supports signal compression standards and a tuner (you need to find out which one is not outdated at the moment). Many of the most modern TVs do not require a set-top box; an antenna is enough. But not everyone has these, and therefore users often look for the reason why the digital television set-top box does not work, although the problem may be in the TV itself.
Practice
Let's say you have chosen terrestrial digital television for use. You can use the most ordinary antenna, which picks up two or three channels well in fairly good quality, a couple more in poor quality, but even those in very good weather. This antenna requires an attachment. For example, DVB-T2. Any one is possible, they are technically almost identical. Most often, set-top boxes have two outputs - SCART or “tulip” and an HDMI output, as well as a USB connector for viewing the contents of electronic media. The boxes for all consoles are different, but they seem to be made at the same factory in China. Therefore, when purchasing, you need to carefully inspect the control panel, as the most frequently used item, to see if everything is in order with it. Otherwise, there will be problems in switching channels, adjusting the volume, and the like. If all is well, you can connect the antenna to the set-top box, and the set-top box using a “tulip” (usually sold in one set with the set-top box) needs to be connected directly to the TV.
Here you need to know that the RCA connectors for stereo sound and video signals are the same “tulip”. Yellow is for video, white is for left stereo or mono, and red is for right stereo. If the TV picture tube is obsolete, the “tulip” will help out. If the TV is plasma or LCD, it has an HDMI output, and you need an appropriate cable, another will not work. You need to purchase it separately. Otherwise, the user will not like the image too much. The TV needs to be switched to AV mode, then the set-top box interface will appear. Setting up the console is not too complicated. Even if you just do everything by default, the quality will completely satisfy even connoisseurs. The main thing here is to configure the channels themselves. The menu has a channel search. You can also select auto search. In a few minutes everything will be ready. This will be enough for almost any settlement.
From electronic media
As already mentioned, it is needed in order to play back what was recorded on a flash drive. To do this, you need to insert a USB device into the set-top box, go to the menu, select "USB" "Multimedia", then select the desired format - video, pictures or music. The contents of the flash drive will open on the screen. Now you need to select the desired folder and open the file. Everything is even simpler than doing this with a laptop or computer. However, many people still cannot figure out these operations on their own. Especially the elderly, who cannot keep up with the rapid movement of technological progress, need help. Young people cope best with this. And even small children are much more adaptable.
But that is not all. A user who has such an antenna attachment for digital television should know that it is possible to perform the reverse operation. For example, record your favorite program directly from the TV onto a flash drive. And the steps for this purpose are just as simple. Just press the “Rec” button on the control panel of the set-top box, and the recording will obediently go to the USB device. In a word, digital television today, even for a remote locality, is not a myth or a dream, but a completely feasible thing. And if it is digital terrestrial, then a resident of the outback or temporarily settling in a dacha or village does not necessarily have to spend about ten thousand rubles on installing satellite television, and then pay a considerable subscription fee. You can still achieve comfort today with small means.
Trust the provider
Almost everyone enters into an agreement with a provider in order to receive digital television services. Long-running and fairly powerful companies supply a set of equipment to the user, such as, for example, Rostelecom. However, almost all providers do not satisfy the client on the day of contact. You have to wait a day or two, and if this is the outback, then a week, not even one. In order not to waste time, and digital television to work immediately, you can do the initial setup yourself. This knowledge and skill can be needed by literally everyone, even if you have to move the TV to another room or exchange it for a new one you just bought. Therefore, everyone should understand connection diagrams and configuration technologies.
The same Rostelecom offers this service in two versions - together with the Internet (“Interactive 2.0”) and separate digital television (“Interactive TV”). The latter can only work on a router that belongs to the company; others will not work. And Rostelecom’s routers are disgusting, that’s what all the reviews say. Therefore, it is better to choose 2.0, and if there is no other provider nearby, you will have to call technical support almost every day with the question: why does digital television not work during the day? You won’t be able to connect version 2.0 yourself; you’ll still have to wait for technicians. Rostelecom's settings do not match with other people's equipment. The user is lucky if another provider is nearby and can connect him to their network.
Situations
1. The set-top box leaves the normal mode. This can happen if it is turned off for a long time. You just need to plug it into the network and not be afraid of the inscription that says that the channel is DRE encrypted. If you wait a couple of hours, the operation of the receiver will be fully restored and all encrypted channels will open.
2. It may happen that the set-top box (receiver) is not registered. To eliminate this situation, you need to look at the identification number on the back panel and enter it on the provider’s website.
3. Sometimes the antenna settings get lost. Such cases are described above. Here you will need the help of a specialist who will reactivate them.
4. If a paid channel sign suddenly appears on the screen, you just need to pay for a subscription to the provider’s services; apparently, the user forgot to do this on time.
5. Sometimes there are difficulties with software compatibility. This will require some dexterity. If the receiver is GS-HD, you need to restore the channel list in the menu (there is such a key there). And if that doesn’t work, you need to press two buttons on the remote control and on the receiver panel at the same time (this is the most important thing) - CHANNEL and TV/RADIO. Exactly at the same time - with four fingers. And then press STANDBY on the remote control. And everything has to fit together in the software.
6. If “No Signal” appears on the screen, you should look for a solution to the problem with the antenna. This has been discussed a lot above.
7. Check the cable. If it doesn't help, call a specialist.
The fleet of analogue TVs is rather reluctant to give way to digital equipment, gradually taking “second” places - in the kitchen, in offices, garage workshops, etc. At the same time, DVB-T2 set-top boxes are also carried. We have already managed to evaluate the advantages of the latter; some owners also appreciated the disadvantages - the rather low reliability of these devices. As a rule, one of the weakest points of this kind of equipment is the switching power supply - most cases of failure are associated precisely with a malfunction of the power supply, and a malfunction of the power supply can entail such serious consequences that repairing the device will be impossible. And yet, using the example of two digital TV set-top boxes, the possibility of repairing them independently will be considered here. The first device was TVK 3101. When turned on, the image had severe distortion and periodically disappeared completely. A few days later, the set-top box began to turn off a few seconds after the manufacturer's logo appeared on the screen.
The second device is the Oriel 740 set-top box. This device did not respond to commands from the remote control, the indicator barely glowed red.
After opening the console cases, it turned out that in both cases the electrolytic capacitors of the secondary power filters were swollen.
It should be borne in mind that when working with the set-top box, special care should be taken - the primary power supply rectifier converts an alternating voltage of 220 volts into a constant voltage of about 300 volts, and this potential remains at the terminals of high-voltage electrolytic capacitors for some time after the power is removed - up to several tens of seconds . In the pictures they are located between the pulse transformers and the plugs of the power cords. Before working with the device board, these capacitors must be short-circuited through a resistor with a resistance of 51-62 kOhm.
Both faulty capacitors turned out to be almost the same - 1000 µF, 10 V. The picture shows one of them. The fact that its lid looks barely deformed should not give you the slightest confidence in the serviceability of the part - even if some part of the container has been preserved, such a part will have an increased leakage current, which is unacceptable. When replacing, you should select capacitors with the same operating voltage or with a slightly higher one, as in the picture - instead of a 10-volt part, a 16-volt part is shown, and with the same dimensions. Of course, faulty parts should be replaced with new ones, not used ones - otherwise the repair will soon have to be repeated.
After replacement, we turn on the set-top box - the indicator lights up brightly, the device responds to remote control commands, the image is stable. But the renovation is not finished yet...
There are traces of flux on the board - solder paste, rosin... Through such a coating, high-frequency currents can quite easily pass wherever they want. As a result, over time we may get an unstable image, noise, etc. troubles. Therefore, carefully wash the board with a cotton swab moistened with alcohol or acetone. After such cleaning, wipe the board with a dry cotton swab.
We install the board in place, check - it works.
Now we assemble the console completely and check its functionality again.
We check the second device in the same way - the device is working normally, the repair is completed.
In conclusion, I will add that the quality of the antenna amplifier power supply also greatly affects the operation of the set-top box. Thus, if the capacity of the filter capacitor is insufficient, signal loss is possible - there have been cases of complete loss of channels of the second multiplex. To recognize a malfunction of the antenna power supply, it is enough to replace it with a DC source of 9-12 volts (for example, a Krona battery or a battery from a computer uninterruptible power supply). If the reception quality improves, you should replace the antenna power supply with a known good one.
Today it is difficult to imagine life without television broadcasting. No signal is a fairly common problem that most TV owners face sooner or later. There may be several reasons why this malfunction may occur. These primarily include:
- problems with equipment;
- preventive work;
- external factors.
The most common reasons why there is no stable signal on your TV from this category are usually:
- connecting cable defect;
- malfunction of the satellite dish or antenna;
- failure of the satellite converter.
A problem with connecting cable may be a completely obvious answer to the question of why there is no signal on the TV. If the antenna or satellite dish has a poor connection to the device due to cable damage, this situation is quite justified. Check the plugs and the wire itself for defects. By the way, the quality of the wire itself also affects the transmitted signal, so it’s not superfluous to know.
If you are using a satellite dish to receive a TV signal, you need to make sure that it is in correct position(We'll give advice on how to do this just below). If your satellite receiver is covered with a layer of dust, ice or dirt, it is not surprising that it does not work. In this case, you should carefully clean the surface.
Malfunction satellite converter is a fairly common reason why there is no satellite signal on the TV. The converter functions as a regulator that lowers the frequency of the signal from the satellite to reduce losses during signal transmission. To solve the problem, replace the faulty converter with a new one.
Important: if you are not sure that you know how to perform such manipulations with a satellite dish, entrust this task to an experienced technician. Otherwise, you risk causing irreparable damage to the device.
Preventative work
If your TV says “no signal” in extremely rare cases, your operator may be carrying out maintenance work to eliminate delays and other problems in broadcasting the TV signal. The only way out of this situation is to wait until the preventive work comes to an end. It is quite simple to distinguish one reason for the lack of a signal from another:
- take the remote control from the receiver;
- enter the system menu;
- check if there is a message “no signal” in the receiver menu.
If the device starts writing about the absence of a signal in its system menu, then the problem lies in your operator's satellite. In some cases, the set-top box may freeze (for cable TV subscribers). Try rebooting the device: disconnect from the network, and after 30 seconds turn it on again. Perhaps the problem will go away. The same steps can be done with.
In any case, it would be a good idea to contact your digital television provider to find out what to do in this situation.
External factors
How to set up a satellite dish yourself
To set up a satellite dish yourself, you need to:
- go to the operator’s website and find an angle calculator;
- enter satellite coordinates and find out your location;
- aim the antenna at the satellite using the data obtained earlier.
Determine your current location can be done using a regular smartphone. As a rule, their accuracy is sufficient to select the optimal direction of the plate.
If you often have problems with a lack of signal, then information about methods will be useful to you. This may require . In any case, this is a solvable problem, both for old TVs and new ones.
Even as a child, living in the village, I always tried to tune the TV to good reception of a large number of channels. The only option that I understood for myself from these attempts is that the higher the antenna is, the better the quality of the channels and the greater their number. But there is a limit to the height of the antenna mast. Therefore, some channels were always shown well, some were shown not so well, and some were not shown at all. Now, living in the city, you don’t experience any problems with the quantity and quality of the TV channels provided, but when visiting a village, sometimes you want to turn on the TV and change channels, choosing an interesting program. But in the countryside, time moves slower and modern technologies arrive there late, and sometimes don’t arrive at all.
In this regard, I set out to set up as many television channels in the village as possible. To begin with, I propose to consider what options are available today for obtaining a high-quality signal and picture on the TV:
1Cable TV- television, in which the signal is distributed through a television cable that is directly connected to each television
Pros: high-quality TV.
Cons: Subscription fee, available only in large cities.
2 Satellite television. Satellite television broadcasts using a satellite suspended in low-Earth orbit. The signal is received by TV viewers on an individual dish antenna.
Pros: high-quality TV.
Cons: Cost of equipment, subscription fee.
3 Terrestrial television. Terrestrial television distributes the signal using terrestrial repeater stations; in order to receive this signal, you must use an antenna.
Pros: minimum costs.
Cons: signal level is often low; the display and quality of channels depends on the weather, distance from the tower, mast height, etc.
You can also say that TV channels can be watched via the Internet, but in this article I would like to talk about watching channels without using a computer/laptop, and especially the Internet.
Of all the methods described, the only one that suited me was using satellite TV, but I really didn’t want to spend money on buying equipment and then paying a subscription fee. After scouring the Internet, I found an alternative way - terrestrial digital television. The essence of digital television is the following: the transmission of television images and sound occurs using digital encoding of the video signal and sound signal using digital channels. Digital encoding, unlike analogue, ensures signal delivery with minimal losses, since the picture and sound are not influenced by external factors (interference). Of the nuances of using digital television, I will note the following - a television channel in digital television has two situations, it will either work in good quality, or it will not work at all. Unlike analog TV, there is no borderline state or interference, the only exception is if the channel has very poor communication quality, it can slow down, turn off and turn on again, to avoid this you need to use another antenna, raise the existing one higher or turn towards the TV tower .
What you need to watch digital television:
TV antenna;
TV or set top box (Set Top Box) with tuner DVB-T2(namely DVB-T2, the outdated DVB-T will not work), support for the MPEG4 video compression standard and the Multiple PLP mode.
You do not need to buy an additional antenna, just use an antenna for an analog signal. But the antenna itself is not enough, to watch digital TV you need a set-top box with a DVB-T2 tuner (some modern TVs do not need such a set-top box, since it is built into the TV, this information can be obtained from the documentation for the TV or on the manufacturer’s website, which discusses a similar case ). Set-top boxes are not expensive, on average from 1500 to 2000 rubles. In fact, you don’t need to buy anything other than this set-top box. Another plus is that you don’t need to pay a subscription fee for terrestrial digital television.
It is important to note that digital TV allows you to view a limited number of channels; at the time of writing there were 20 (possibly less depending on the region of residence).
Digital television is not configured according to the principle - the higher you raise it, the more you catch. You can only tune these 20 channels, plus you can add more analog channels that your antenna will pick up (if your DVB-T2 set-top box or your TV has such a function). To learn more about the number of channels and the possibility of using digital television in your region, you can call the RTRS hotline: 8-800-220-20-02 (calls within Russia are free) or on the website: www.rtrs.rf.
So, I propose to move from theory to practice. In my case, I used a regular television antenna, which was very popular about 15 years ago. With this antenna I managed to catch about 3 analogue channels in good quality, 2 in satisfactory quality, and a couple more channels appeared in poor quality in good weather.
I purchased a DVB-T2 set-top box. Regarding the choice of consoles, I didn’t rack my brains, since technically they are all as similar as two peas in a pod. Most of them have two outputs - tulip (some SCART) and HDMI, there is a USB connector for viewing the contents of USB media. I got the impression that they are all made at the same Chinese factory, only they are equipped with different boxes and labels. When purchasing, pay attention to the control panel of the set-top box, since you will use it constantly (switch channels, turn the volume lower, higher, etc.).
I connected the antenna to the DVB-T2 set-top box, and connected it to the TV using a tulip (it usually comes with the set-top box).
Tulip RCA connectors for video and stereo audio. Yellow is for video, white is for monaural or left channel of stereo two-channel audio, red is for right channel of stereo two-channel audio.
I’ll make a reservation right away that I connected the set-top box to an obsolete CRT TV, so I chose a tulip cable. If you have an LCD or plasma TV with an HDMI output, then you should connect it with a proper HDMI cable (it must be purchased separately), since the image quality will be much higher.
I switched the TV to AV mode and got to the DVB-T2 set-top box interface. Setting up the set-top box requires minimal effort; all default settings will satisfy most users. The main thing you need to do is set up the channels. To do this, I went to the channel search menu and selected Auto search.
A few minutes later, the DVB-T2 set-top box found those same 20 channels + 3 radio stations. But a few days later, channels 11 to 20 disappeared, on the website rtrs.ru I saw that the towers to which I connected did not support 2 multiplexes (from 11 to 20 channels), and the fact that they worked for a couple of days was most likely tests. As a result, I purchased a high-quality, “strong” antenna to watch all 20 channels. Test video below.
Antenna test video ANT-T2-MAX
In order to understand the capabilities and settings of this set-top box, I offer a photo of each menu item (please excuse the low quality of the photo).
A digital set-top box, as I wrote earlier, can play files from a USB flash drive. To do this, insert the USB device into the set-top box, go to the menu, select "USB" - "Multimedia", select the playable format (music, pictures, video).
In addition, digital set-top boxes have the ability to record images from the TV to a flash drive. To do this, just press the “Rec” button on the control panel of the DVB-T2 set-top box, after which the recording will begin on a USB device.
To summarize, I am very pleased with the quality and quantity of digital TV channels (of course, more channels are possible, but not all at once). In my opinion, for remote places, dachas, villages, towns, where people are not ready to spend 10,000 rubles on purchasing satellite TV + pay a subscription fee, I consider this option the most suitable.
Digital television is no longer an innovation these days, but problems with its functioning are not uncommon. Therefore, very often users have the question of why digital television does not work.
In this article we will look at the main causes and ways to eliminate them.
Common causes of problems
If the device is working properly, there are no problems with connecting the wires, the flow of electric current, etc., then the problem is related either to the settings of the set-top box or to the antenna.
So, in cases where you did not catch all channels during auto search, you should do a manual search. It is likely that you need the frequency of a nearby tower. If no image is displayed from the set-top box, then the reason is an incorrect connection or selection of video input. It is possible that the set-top box is simply not connected. After all, it should be connected not only through an outlet, but also started using the remote control. In this case, the indicator light should turn green.
If you make sure that the set-top box is connected and you have an image, but you are given the message “no signal,” then the problem is with the antenna. It is either not connected, is faulty, or you did not turn on the amplifier. Therefore, the first thing you should do is check the antenna, and then repeat the auto search.
Suppose that the auto search did not find anything, and on the set-top box you see the inscription “no services”. It is also possible that your channels will stop showing and you will see a similar message. In such situations, the reason is a bad signal. Here you need to conduct a manual search on the frequencies transmitting your signal. This is due to the fact that in cases of a weak signal, the auto search does not find anything, but the manual search shows even weak signals.
The reason for this phenomenon is your distance from the tower or the number of neighboring buildings that interfere with reception. It is important to note that when the intensity is low, signal amplification is necessary. In such a situation, you should purchase an amplifier or place the antenna outside or make it higher.
