LG TV picture loss what to do

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Why can LG TV screen go dark

There are a number of problems that can cause your screen to go dark and your TV to stop showing. They are the same on TVs of different brands and can occur on LG products as well as on a device from Samsung or another brand.

If when you turn on your LG TV the user finds that the screen has become dark, and the picture is almost not visible, the cause of failure may be:

If the power supply has failed due to a power surge, poor quality soldering, blown capacitors or for other reasons, the TV screen will stop shining or stripes will be visible on it.

To perform a diagnosis, the unit is disconnected from the power supply and disassembled. Signs of failure are burned parts, burnt holes, blown capacitors, etc.д.

You need to find the damaged unit and fix it, sometimes you need to replace the entire power supply. Check the part after repair can be done with a multimeter or with a normal light bulb connected.

If the unit is serviceable, it will light up brightly, then dim and burn at half power. If the unit is damaged, the lamp will always be very bright. The same method will save chips from damage if a faulty or incorrectly repaired unit is plugged in.

How To Fix LG TV Blank Screen for Zero Cost !

If the video amplifier fails, the screen goes dark, but there is sound. The second sign is a uniform white or green display light. You need to open the brightness settings and change this parameter. As a rule, the monitor with such a defect does not respond to the user.

Inspect the damaged unit and check the integrity of the capacitors. Broken elements are replaced, in rare cases the whole defective part must be replaced. Breakage of T-con board is similar to motherboard malfunction, so it’s better to trust such repairs to specialists. Some receivers are equipped with a special T-con Board diagnostic function. Disconnect power and LVDS cable.

A test picture will appear on the screen, if there is distortion on it, it means that the part is out of order. In most cases the entire board will need to be replaced. Sometimes the problem may be caused by oxidation on the LVDS cable pins. If they are cleaned with an ordinary eraser, the problem will disappear.

Samsung

Consumers often wonder why the screen on the TV Samsung became dark and what to do to fix the failure. Technics of this brand breaks down for the same reasons as LG devices. To fix the problem you need to check the power supply, video amplifier and T-con board. If these parts are intact, the problem may be matrix related.

picture, loss

On modern models of TVs, such as LG or Samsung, often the TV screen goes dark if:

  • the power saving is set;
  • The night mode is always on;
  • The brightness or contrast is not adjusted correctly;
  • The LEDs or backlight bulbs of the screen are out of order;
  • The circuitry controlling the backlight lamps is broken;
  • The inverter driver is faulty (the characteristic darkening in the middle of the monitor appears);
  • The converter module has burned out;

So, if only the bottom part of the screen of older models is darkened (with thicker case), the problem is most likely with one backlight bulb or its power supply circuit. In newer versions of TV tuners dimming can be caused by breakage of LED strips that illuminate inside the liquid crystal matrix. The elements of the strip are connected in series, and when one of them burns out, the whole strip shuts down.

In normal operation, the backlight is supplied with power from an inverter (about 200 V). This is provided by the backlight control LED driver. A malfunction in its functioning may also be the reason why the TV gets darker.

Dark screen may not be due to settings or backlighting. Reasons for the sound being there but no picture can be the following:

  • The HDMI cable is faulty;
  • Elements in the power supply unit, e.g. capacitors, are defective;
  • Malfunction of the motherboard (main board);
  • The matrix itself is damaged;
  • Problems with the input signal (antenna, TV boxes, cables, connectors);
  • Broken decoders, stubs or converters.

To pinpoint the problem it is necessary to perform a full diagnostic of the device.

No picture on the TV, but the sound is there. how to fix the problem

Nowadays, few people can do without a TV. Every year the models are getting thinner, bigger and offer more and more new features. Modern plasma panels with Smart TV technology have not much in common with the devices that were sold about ten years ago. However, there are still some similarities between the old and the new generation. breakdowns and malfunctions still occur. The causes can be very different: bumps, falls, ingress of moisture and direct sunlight or an elementary mistake. In this article, we will consider in detail what to do if the TV image is lost, but the sound is. Let’s sort it out. Let’s go!

What to do if there is no image on the TV

First it should be noted that such a malfunction is quite common in a variety of brands of TVs. TVs of all brands are equally affected by this problem: Samsung, LG, Philips, Sony, Panasonic, and many others. That’s why there is no point in blaming the manufacturer.

There are many reasons for the lack of image on the screen, and it is unlikely you can determine it yourself by eye. You will most likely need to apply to a service center or other repair service. It depends on the nature of the problem. Read more about this below.

It happens that when you turn on the TV, first there is a splash screen with the manufacturer’s logo (LG, Samsung, Philips, and so on), then the screen simply goes out. And you can switch channels and hear the sound. Some users have noticed that after a while the picture appears, but then, when you turn it on again, everything repeats and there is no picture. If this is the case, try the following tips:

  • Check the connection of the receiver cord since it might be loose. Make sure that the cord is connected securely. If there is no video signal from the set-top box, many televisions simply turn off the screen.
  • The problem can also be in the cable itself. The cable can be damaged or it can be simply of poor quality. It is true not only for HDMI cables, but also for bell cables. Their audio and video signals are transmitted through separate wires, and the problem can lie simply in a broken wire or bad contact. In some cases, replacing the cord can fix the situation.
  • Check the power cord. It must also be connected securely.
  • Some users found rather original way to solve the problem. to turn volume up to maximum (or close to it). After a few seconds the picture will appear and then you can adjust the volume to an acceptable level.

Please note that the above tips will only help if the screen is working. This is indicated by a splash screen when you turn on the TV. If you don’t see the startup screen and the screen is permanently dark, this is an indication that some component in your TV that is responsible for the picture is defective.

There are several components, failure of which may cause no picture on the screen. Quite often there is a failure of the inverter which supplies voltage to the backlight. Also bulbs can fail also, and this, in turn, provokes breakage of the power supply unit. In addition to the faults listed above, breakage of the matrix or motherboard is not uncommon. The problem may also be in the cables, converter and decoder. In this case the non-working parts and elements must be replaced with new ones.

It is not recommended to do the repair yourself, because modern televisions are quite complex devices, and you risk aggravating the situation even more. If the above simple tips did not help, then the best solution is to contact professionals, because you will need to disassemble the TV. It can be a service center of the manufacturer or a private office, where the repair will hold qualitatively and quickly.

Either way, it’s impossible to determine what the cause of your particular TV’s failure is without a thorough inspection. In any case the device needs to be disassembled and diagnosed for nonfunctional parts and components. It is best to have this done in a workshop with the proper conditions, but if you do not like this option, many telemasters provide all of these services at home.

Of course replacing some parts can cost a lot of money, but you should note that matrixes and motherboards fail very rarely. Failure usually occurs as a result of physical damage to the part, such as dropping the TV or getting wet. In general, you can’t do without a telehandler.

Now you know what to do if your TV is out of picture but has sound. You will also understand what can be the cause of this malfunction. Write in the Комментарии и мнения владельцев if this article was useful for you, share your experiences with other users to solve similar situations, and ask any questions of this article.

No picture on the TV, but the sound is there. how to solve the problem with your own hands

Almost every family has a TV at home. Models may differ from one another, but the task of the object remains the same to carry information and entertainment load. Every year the functionality of the TV improves. So those models that were common 10 years ago are obsolete today.

The panels are sold extra thin, with large screens. Modern Smart TV technology is not much like older TVs. The only thing that remains common is that both past and present models break. The most common breakdown, when there is no picture on the TV, but there is sound.

System part

When there is no image on the TV, but you were able to identify that the backlit screen is fully serviceable, but do not show TV channels. look for the problem in the connection of cables (replace them), in the serviceability of the decoder, the correctness of channel settings.

Faulty video signal

When LG TV is paired with a TV tuner for sound and picture are often involved wires that transmit sound and video separately. If the screen is black but sound is coming in, check the component and composite wires:

  • RCA (tuning tubes). they are often implemented to connect digital receivers to televisions, oriented to receive only analog signal. Check the yellow, red, or both plugs. They are responsible for the picture. They can be loose, damaged, or plugged into damaged connectors.
  • VGA/HDMI are component wires that have a single plug with multiple PINs. When one of the wires inside is damaged, the video simply doesn’t work. We recommend replacing the cable, or using a different type of cable (if feasible).

If you doubt the cable is damaged, check it works on other equipment.

Decoder problems

Not only is there a problem with the cable, but also a problem with the decoder. It may be installed:

  • In a TV. if the signal goes to the TV directly through the cable.
  • In a receiver. when receiving a signal through an antenna cable and outputting the picture to the TV through component and composite wires.

To repair or firmware a decoder is not an easy procedure and requires disassembly, replacement or connection of a programmer for reflashing. If firmware is priced right, then replacing the decoder is almost equivalent to the price of a new receiver. If the decoder is broken on the TV, it is recommended to replace the decoder, not the TV.

The main reasons why the TV does not show the picture but there is sound

Modern televisions are reliable and functional devices. But even they are prone to malfunction. Especially often users complain that the picture on their TV is lost, but the sound is there. In this article we will consider the key causes, how to fix them, what to do in a particular case.

We will talk about the new models of devices with a thin screen and Smart. After powering on the TV, it may behave as usual. it may make activation sounds. And also the sound of the TV channel will be heard, and the screen is dark, as if we have not turned it on.

This leads to the following conclusion: the elements of the chip, which are responsible for projecting the image on the screen, are broken.

It can be the following parts and modules:

  • Power supply. because of the output of this equipment is incorrectly distributed voltage to different parts of the chip. This is a serious breakdown in the TV, which must be repaired immediately. Otherwise, this threatens the failure of other parts of the TV Samsung, LG, BBK, etc. This is a serious problem with your TV and must be repaired immediately (do not repair if you do not know what to do);

There are also less serious breakdowns that you can try to fix yourself. This happens because of the low voltage from the network. Or other factors that affect the operation of the internal system.

Often, to accurately determine the breakage, users have to go to the workshop. Since it is quite difficult to determine the causes when the TV is on, but there is no sound, but no picture. Full diagnosis and fault detection can be carried out only with the appropriate devices.

System part

When there is no picture on your TV and you were able to determine that the backlit screen is fully serviceable, but TV channels do not show, look for the problem in the connection of cables (replace them), in the serviceability of the decoder, the correctness of channel settings.

Faulty video signal

When an LG TV is paired with a TV tuner, there are often wires that transmit audio and video separately for sound and picture. If you get a black screen but sound is coming in, check the component and composite wires:

  • RCA (tuning tubes). they are often implemented to connect digital receivers to TV sets which are aimed at receiving only analog signals. Check the yellow, red or both plugs. They are responsible for the picture. They may be loose, damaged or plugged into damaged connectors.
  • VGA/HDMI are component wires that have a single plug with multiple PINs. When one of the wires inside is damaged, the video simply does not work. It’s recommended to replace the cable or use a different kind of cable (if it’s feasible).

If you doubt that the cable is faulty, check that it works on other equipment.

Problems with decoder

Not only is it possible that the TV signal is malfunctioning over the cable, but also that the decoder is malfunctioning. It can be installed:

  • On the TV set if the signal goes to the TV set directly through the cable.
  • In the receiver when receiving a signal through the antenna cable and outputting a picture to TV through the component and composite cables.

Repair or firmware of decoder is not a simple procedure and requires disassembly of equipment, replacement or connection of a programmer for firmware. If firmware is priced right, replacing the decoder is almost equivalent to the price of a new receiver. If the decoder is broken on your TV, it is recommended that you replace the decoder, not the TV.

How does the problem appear?

If there is no picture, but sound track is still playing on the TV, the problem can be easily solved by yourself.

First of all, you should determine the type of malfunction, because it can manifest itself in different ways:

  • There is no picture (may be just a black screen), but the channels are switched and the volume is adjusted with the remote;
  • Loss of image with inability to navigate channels. There is sound. Often error signals are heard instead of the sound of the saved TV channel;
  • The backlight does not work. If when bringing a flashlight (or other light source) to the screen the picture appears, the LED backlighting on the TV stops working. The picture is there, just the eyes hardly perceive it;
  • Picture distortion. The system changes the image proportions, TV channels are shown in poor quality, etc;
  • The color scheme has changed, the picture has become dull;
  • The TV works, but while watching the screen spontaneously turns off and after rebooting it turns on again.

Note that there may be other varieties of the problem, but the options described above are the most common. The rest of the distortions mostly refer to problems with the signal or Internet connection.