What to do if the TV does not show: reasons and solutions

The principle of operation of a modern TV

If there is no image on the screen, but the device transmits sound, most likely the malfunction is related to the picture formation circuits. If previously the equipment operated using a ray tube, where close attention was paid to the posistor, then modern devices operate with the mandatory use of backlighting. This parameter primarily determines the price of copies.

Illumination is carried out using different means:

1. Halogen lamps covering part of the monitor or the entire perimeter;
2. Organic diodes, which increase the cost of products;
3. Lamps for ignition and combustion, which require a high voltage discharge.

Important!
Transformers help achieve high voltage values ​​in small devices. The pulse generator is controlled by a pulse-width modulator or a special key, an inverter. Depending on the width of the pulses, the power of the transmitted signal and the brightness of the image change. The inverter starts the transformer, it avoids the output current scattering. Once the power reaches the dimmer, the signal travels through the circuit, generating a current and causing the backlights to light up.

How to prevent a situation where channels are not shown

For reliable operation of an electrical device, it is necessary to follow the operating instructions. For TV it's easy:

• Do timely cleaning and remove dust;
• prevent hypothermia and overheating of the device;
• install a voltage stabilizer;
• exclude mechanical damage.

If the device is not defective and is used carefully and carefully, it will serve its owners for a long time and will not require maintenance, and a situation where channels do not work can only arise due to malfunctions of the cable operator.

Why doesn't the TV show

All possible problems that affect the absence of a picture or its poor quality are conditionally divided into two categories - those related to hardware and those related to software settings. The first category includes problems associated with the breakdown of the unit itself or its parts.

Broken

If the device was functioning properly, then suddenly there was a click and the screen went blank, the likely cause is a power surge. At the same time, the protective relay is activated and knocks out the fuse located in the power supply.

The screen may suddenly go dark due to a power surge

In the best case, the black screen will only appear for a few seconds, after which the device will resume operation. More unpleasant consequences include the following symptoms:

• burning smell;
• smoke from the body;
• presence of sparks;
• ignition.

Attention! If any of the described consequences occurs, you should immediately unplug the cord from the outlet. It is necessary to act according to the situation to minimize the threat.

Backlight burnt out

If there is no picture, but there is sound, the cause of the breakdown is a burnt-out inverter or the combustion lamps themselves.

Inverter

The element is responsible for moving current from the power supply to the lamps or LEDs. Thanks to it, the monitor is illuminated and the image displayed on the liquid crystal matrix is ​​perceived by the eyes.

Inverter connection diagram

To check the serviceability of the inverter, you should make sure that the fuse is intact and measure the incoming voltage, it should be 12 V. If everything is in order outside, then the problem lies inside the device. You need to check the power supply to the dimmer circuit. If a breakdown is detected, the burnt-out part must be replaced with a new one.

Backlights

A typical malfunction for Chinese vehicles such as Supra, Xiaomi, Fusion, Mystery and others. It can be detected very simply: you need to shine a flashlight into the black display. If there are any changes on the monitor, which indicates a change in pictures, the inverter or lamps are to blame. If no movement is observed, then the LCD screen itself is broken. The first option is simply resolved by replacing the failed element, but in the second case everything is much more complicated and more expensive.

LCD screen is broken

Not the most popular cause of a malfunction, which is easier to prevent than to fix later. A signal indicating the need for urgent repairs or delivery of the unit under warranty is one of the following symptoms:

• the monitor darkens, dims, lacks contrast;
• the image is transmitted as in inversion, or as a negative;
• the picture is shown in all the colors of the rainbow;
• the channel is displayed only on half of the display;
• spots or streaks appear on the screen;
• Rarely is the video displayed upside down.

  
  If you have one of these signs, you need to take the TV to a service center

Important! If any of the described problems occur, you should immediately contact the service center, otherwise the monitor will fail, and its repair will be very expensive, which is not always justified.

Why digital television does not work today: reasons

Experts now divide the reasons for digital television not working into 4 points:

• software lags;
• planned repairs;
• prolonged negative weather conditions;
• termination of broadcast.

Before taking decisive action, it is necessary to determine the root cause. If the picture disappears from time to time and the sound lags, it may be due to bad weather - thunderstorms or heavy snowfall. Software glitches occur due to old firmware. Or deformation of working elements.

Next, we talk in detail about the quality of broadcasting and what to do to improve it, depending on the symptoms.

The equipment has failed

If the equipment does not respond to actions, this is due to:

• receiver failure;
• deformation of the antenna or cable.

If you turn on the set-top box and the indicator does not respond, then the problem is with the set-top box. There are cases when the indicator works periodically, which also negatively affects the signal.

If you have any questions or complaints, please let us know

Ask a Question

If the sound lags, then this is also a reason to check the console. The device turns on and off involuntarily and does not respond to tasks set by the remote control.

What does error code 1 mean in Okko TV: reasons, what to do?

If the cable is deformed, the signal will also not flow normally to the TV.

Experts recommend inspecting the RG-6 wire. It is subject to the negative effects of water. This type of wire does not last long and will require immediate replacement.

Another reason is cable deformation. If the antenna is in the room, it rarely breaks. Most often, antennas that are located outside are susceptible to damage. The catalyst for their malfunction is thunderstorms and rain. First try to resolve the problem by rebooting the receiver. If it doesn't help, follow the simple algorithm:

• inspect the cables and plugs for serviceability, make sure that they are connected correctly;
• check the voltage level coming from the adapter and receiver;
• test the operation after connecting the new antenna.

Sometimes the lack of signal occurs due to the fact that the antenna is directed in the opposite direction of the mast. But modern TVs already have built-in DVD T2. This is provided that the device was released after 2012. But it can also have malfunctions.

No contact with cable

Lack of contact with the cable is a frequent breakdown, since it is located outdoors and is easily susceptible to external negative factors. It is necessary to carefully inspect it and, if there are cracks, replace it with another one.

Malfunction of the digital receiver power supply

Due to the active operation of the receiver, the power supply constantly operates in enhanced mode. But if it breaks, it can easily be replaced with another one.

TV breakdown

If the tuner turns on (the indicator reacts), but there is no image, the TV itself may be broken. Check the TV for serviceability after pressing the buttons on its panel.

Bad weather

If you have previously used satellite TV, then the lack of signal due to bad weather is a familiar situation. DVB digital television may also experience problems if there is heavy rain or snow.

Bad weather conditions interrupt the signal, which explains the lack of picture and intermittent sound. To confirm this particular reason for the poor signal, connect amplifiers. If the signal quality has improved, then the system simply reacts to what is happening outside the window. You can also simply wait out this period.

How to connect a digital TV set-top box to an old TV and set up channels?

Termination of broadcast

If the broadcast has stopped, then most likely repair work is underway. To confirm this idea and clarify the duration of this process, go to the website www.rtrs.ru. A special sign will also appear on the screen, which will notify you about the prevention.

Sometimes the receiver stops working completely. The first 10 channels out of 20 can be displayed. Set the signal level. If the indicator is zero, then most likely the second multiplex is disabled.

Failures of the first multiplex in Russia are rare. The second problem is due to a simple lack of funding. There are still regions where analog TV still works. Due to signal overlap, the second multiplex may simply not reach users. The sooner users completely abandon analog TV, the sooner the second multiplex will begin to work more correctly throughout Russia.

Repair work

Sometimes the TV does not display a picture due to planned repairs or an emergency. This information is clearly displayed on rtrs.ru. Often repairs are carried out after intense weather, with an inciting malfunction on the tower.

Settings are wrong

Sometimes there are situations when the user did not press anything, but the next time the TV is turned on, the message “No signal” is displayed. Most likely there was a spontaneous reset to factory settings. This means that all programs and channels are automatically erased. For solutions:

• open the device menu;
• check that the signal test is correct;
• restart the channel search.

As a result, the channels will be displayed in the usual way.

Unstable signal

The digital television signal disappears if the user has chosen the wrong antenna direction. It should be towards the tower. The plugs may also come off.

Antenna malfunction

Faulty antenna - deformed cable. Inspect carefully and, if necessary, install a new one. You won't be able to watch HDMI channels without an antenna. Often, in some homes, users receive a signal

from a common antenna.

Why Rostelecom IPTV does not work on TV and computer: reasons, how to fix it?

Problem with the console

The receiver informs about its inoperability with an indicator - it either does not light up at all or does so periodically. If the device still does not respond to the remote control, then the reason is probably in the tuner. You need to replace the device with another model. Please note that the tuner may not work if the model is outdated. In this case, you need to buy an updated receiver.

Poor receiver firmware

The problem of low-quality firmware is solved by updating or replacing the equipment. For this:

• download new firmware;
• update on the device;

If the problem is not resolved, find the previously released firmware and install that version.

What actions can you take to fix the problem?

If you find that TV channels are not showing, check the antenna connection. Pay attention to the nature of the breakdown: if all channels are missing at the same time, the problem must be fixed, and if there is only one, this is due to technical problems with broadcasting at a particular station. If you find no obvious defects, contact your service provider to find out the possible cause. Normal operation of the operator indicates a failure in a particular TV, which only specialists can fix.

The staff of the Master-Don company perform all types of work: we will find out why the channels are not showing, replace broken parts and provide a guarantee.

DVB-T2 transmitters within a 50 km radius and their frequencies