Question to a psychologist 

Why doesn't my computer see HDMI? Why can't my computer see my TV via HDMI?

Today, any user using an HDMI cable can connect a desktop computer to a flat-screen LCD TV, and then enjoy an enhanced image. Such a connection is not always successful: for example, it may . But there are times when the computer does not see a TV connected via HDMI at all, although you just purchased the cable from a store where it was extensively tested. There are many reasons for cable malfunction, and searching the real problem must be done sequentially.

What should you do if the TV does not see the laptop via HDMI? Video cards of all modern products support this connection: HDMI on the TV is installed on almost every model. If the connection of the laptop was carried out according to all the rules, but there is still no image, then we connect the laptop to the TV, while sequentially checking all possible problems.

Cable check

Not a single product, even the most reliable brand, is immune from manufacturing defects, especially when assembled by hand. When purchasing, the image quality and sound are checked, but the specific connectors and connection sockets on the TV are never checked - in best case scenario make sure of their availability, and even then not all buyers. It often happens that The cable itself doesn't work, although it has not been used for such a long time. You need to connect the same cable, but to another device, if it functions normally, then the reason that the computer does not see the TV lies in the latter. It is necessary to diagnose the TV to recognize similar signals.

Checking the signal source

Press the button on the remote control to select the external input option. It depends on the specific model of the product which button on the TV remote control you need to press: “source”, “input” or “HDMI” (LG, Sony or Samsung). After pressing, a menu appears on the screen with detailed list of active inputs. Select and confirm by pressing OK or Enter exactly the desired input into which you previously connected the cable coming from the laptop.



Working with the monitor

If the laptop does not see the TV when several monitors are connected simultaneously, then you need to additional settings. These simple manipulations Any user without special education can perform:

  • move the cursor to any free space on the desktop;
  • To display the menu, click on the right mouse button;
  • We find the “screen resolution” section - Windows 7, and if WindowsXP is installed, then “graphic characteristics”;
  • then you need to select an acceptable option to duplicate the screen.

Any laptop has a specific F4 key, if you press it together with the Fm button (located to the right of Crtl) repeatedly, you can select the desired option for the external screen - this is how the computer begins to see TV.

Video card and drivers

Open the “Device Manager” of your laptop to check the driver versions of the installed video card. Obsolete software is the main reason why the TV does not see the laptop. In this case, you need to go to the manufacturer’s website, where you can download new “firewood” - the video card will be updated, you will be able to establish the required connection.

Perhaps the fault lies in the fact that the operating system was infected with viruses or unauthorized penetration of malware occurred. Using a powerful antivirus program (computer protection program) capable of finding all spies of any level, carefully scan your computer and reconnect.

Some experts strongly advise checking the version for your Smart TV platform: sometimes a laptop does not connect using HDMI for this very reason. and perhaps the problem will go away.

Connection port problem

Any connector can have mechanical damage or get burned during a power surge, which is not uncommon in our electrical networks. Experienced technicians advise connecting the HDMI cable when devices disconnected from the network, it is recommended to even disconnect the antenna cable during this time.

There is also a very rare reason why the TV does not see HDMI: it simply does not have additional power on the video card, and without this the connection will not work.

All details and connection options can be viewed using this video:

Troubleshooting algorithm

If you know the reason why there is no image on the TV screen, then eliminating various violations is already a solvable task. This is what the approximate procedure for eliminating detected faults looks like:

  1. Check the connection quality, visually check the external condition of each connector or connecting cables if the laptop no longer sees the TV.
  2. Then the setup of the computer systems is checked: check what choices were made in the menu items responsible for connecting devices.
  3. Check for updated video card drivers.
  4. In some cases, it won’t hurt to check the settings of the video card itself once again.
  5. Perform a smart scan of your entire computer again to ensure no malware.
  6. Visually check the condition of the multimedia ports and their proper operation - a positive result will be immediately visible when connected to another device, for example.

If you have done everything possible, but there is still no signal from the laptop to the TV, try other types of connection. Use a rule of thumb where all existing methods connections. The due diligence process will look like this:

  • first we define available connections and connectors used by our chosen household appliances;
  • disconnect the TV and laptop from the network;
  • connect the laptop to the TV using a proven HDMI cable;
  • turn on the TV, setting up its connection to the computer using the remote control;
  • We activate the laptop, if the signal passes, then a picture similar to the download should be displayed on the TV screen operating system;
  • no signal - go to the “Device Manager” section, find out what active connection types are available;

  • if possible to install connection via VGA, then you need to connect a similar cable to the products;
  • then we carry out the same actions as with HDMI, only press the “VGA” button on the remote control;
  • if you decide to connect via DVI, then connect the cable to the appropriate connectors, and select a similar option in the TV settings.

If the technique never started working together, the reason lies in an internal breakdown, which only a specialist can diagnose and fix. Of course, if you have knowledge in the field of electronic devices, you can try.

Remember that in order to avoid equipment breakdowns, before connecting HDMI you need turn off the TV and computer from the network. Hot plugging can break your computer and burn out the processor. Also make sure that the HDMI input is working correctly and that the input and cord pins are not clogged or bent. One more problem - no additional food to the video card. But working via HDMI requires a lot of energy.

First of all, you need to check whether it is configured correctly on your computer working with an external monitor. If, say, you have a desktop computer and a TV is the only connected means of displaying images, everything will work out automatically. You just need to plug the cord into the input and use the TV like a regular computer monitor. If not, you need to take a number of actions.

Laptops have a special hotkey combination. On mine, for example, it is F8. There should be two screens drawn there. Just press Fn and F8, and everything will start working. In another case, we right-click on an empty space on the desktop and select “ Screen resolution" Then we find the item “ Duplicating screen" You can also create an extended desktop here, thanks to which you can, for example, turn on a movie on your TV, moving the player to a second desktop, and use social networks on your laptop.

What to pay attention to

May be incorrect source selected on TV. In this case, there is nothing surprising. To fix this we take the remote remote control and look for a button on it called “Source”, “Input” or “HDMI”. In the menu that opens, select HDMI. There may be some number or something like that in the name. For example, as in the screenshot: HDMI 1, HDMI 2. There may be several HDMI options. In this case, try each one until it starts working.

Play an important role video card drivers. These are assistant programs for the operation of devices; they need to be updated on time. In order to update them, you can, for example, download the manufacturer’s official program and check the relevance. Or download a program that can automatically update all drivers on your computer, for example: Driver booster or Driverpack solution. There is a third way. Click on “My Computer”, select “ device Manager", find the video card there, right-click and go to the " Intelligence».

Here in the drop-down line we select “ Equipment ID", copy the very first line and paste it into the search engine. Then we look for the most relevant assistant programs that suit your needs. Windows versions, and install. Or you can insert this combination of numbers and letters on a special driver search site. For example, devid.info or website driverpack solution. If there is an installer file in the folder, everything is simple. If not, we go back to the device properties to the “ tab Drivers" and click on " update" Now all that remains is to enter the path to the folder with our drivers and wait for the installation to complete.

We do not exclude the possibility that the computer is simply infected with viruses. Therefore, check it with an antivirus with the current virus database.

Connecting a computer or laptop to TV can occur in different ways:

  1. VGA or D-Sud cable. Almost all monitors, PCs and TVs have this connector. This is an analog connection and is not in the best possible way will convey all the nuances of video files.
  2. DVI. A more modern option. Can work with analog and digital devices. Has its own subclasses.
  3. S-Video. In addition, you will have to purchase an adapter.
  4. RCA or tulips. Connecting a laptop and TV using this method is rare.
  5. Scart. A popular method, since such a connector is found in modern TV models.
  6. HDMI cable. A good option to connect a computer.

Common Causes of Connection Failure

If the TV does not see the laptop, but the connection is complete, then the reasons may be the following:

  1. The cable is not connected correctly or is defective.
  2. Monitor settings error.
  3. Incorrect operation of the laptop or PC video card.
  4. The settings on the TV itself or any other brand are not configured.

Let's look in more detail at why the TV does not see HDMI and the second device through it.

Equipment testing steps

  1. First of all, you need to check the quality of the wire connections and the condition of the connectors.
  2. Next, you need to check that the computer settings are correct.
  3. Then it checks for driver updates and video card settings.
  4. Run an antivirus program to scan for malware.
  5. Checking the port. It is recommended to connect to another device.

Cable check

If the TV connected to the PC suddenly stops working, and until that moment everything was set up properly, it means that the cable has come loose or has been broken. The first option is more common, since you can hook the adapter simply by passing by. But the second one is less common, since the optimal length of the HDMI cable is not so long as to lie on the floor and get under someone’s heavy foot.

TV settings

When the TV does not see the laptop via HDMI immediately after connecting the equipment, most likely it is incorrect to select the signal source on the TV itself.

If there is no signal from the computer, then on the TV remote you should find the “input”, “source” or “Imput” button; it may be written “HDMI” right away on the LG TV. Go to the window that opens and there, in the list of active inputs, select the one you need. Confirm the action by clicking on “OK”.

If the equipment still does not connect after the operations performed, we carry out further diagnostics.

Monitor settings

Having made sure that the signal from the TV is going along the right path, we move on to diagnosing the laptop or PC screen, or rather, to the settings. They can be carried out by any user with basic knowledge of their computer:

  1. Hover your mouse over any free space on the screen and click on the right button.
  2. In the list that appears, select “Screen resolution” or “Graphics characteristics” depending on the type of OS.
  3. Select the appropriate option for displaying the picture on TV. The device passport specifies the acceptable resolution, stick to it.

It's easier to do everything on a laptop. Press and hold the “Fm” and F4 buttons simultaneously until the optimal option is selected. After this, the laptop will connect to the TV correctly and the error that there is no image will go away.

Video card error

Another reason why the connection of devices does not work is the incorrect functioning of the PC video card. In this case, the laptop does not see the other device or does not display an image on it.

To fix this, you need to try installing new drivers that are available on the global network for each device model. Sometimes a complete reinstallation or replacement of an element may be necessary.

I answer all questions in detail.
Friends! Everything you do on the computer, watch movies, cartoons, chat on Skype, play, view photos, slides or Internet pages in a browser, all this will be shown on the screen of your TV if the TV is connected to the computer via an HDMI cable. Nowadays, almost any TV has an HDMI input, and most produced video cards have an HDMI output.
The HDMI interface was invented in order to connect two high-tech digital devices (which are undoubtedly your computer and TV) and transfer information from device to device without loss of quality. Such transmitted information can be an image and multi-channel high-quality sound. If you have a movie or cartoon on your computer, in any HD, Blu-ray or AVI, MOV, MPG, MP4 format, then you can watch it all on your TV. There are slides or photos, please look. I’m not talking about games, because I’m not a supporter of them; they take up a lot of time from young people, which can be spent on studying. We connect the TV to the computer via HDMI with a second monitor To connect the computer to the TV we will use an HDMI cable, it looks like this and can be up to 20 meters long, choose the cable of the length you need.

For example, let’s take a Samsung TV, a not entirely new 4 series (LED type), purchased several years ago, but it already has two connectors for connecting HDMI devices.

The computer that you and I will use to connect to the TV was also purchased around three years back, it has an Nvidia video card installed and also with an HDMI connector.

As I already said, our TV has two HDMI connectors. With the TV turned off, connect the HDMI cable to the HDMI 2 connector,

We connect the reverse end of the cable to the HDMI connector of the video card of the desktop computer. The computer, in turn, is already connected to the monitor (also Samsung SyncMaster 971P) with a DVI cable.

We turn on the computer and TV. There may not be an image on the TV right away, instead we see the following message: “Cable not connected” “Check cable connections and source parameter” or “Weak signal or no signal”

On Samsung TVs, to display a list of all available video sources, you need to press the Source button on the remote control.

A menu appears on the TV, in this menu, using the remote control, select the HDMI 2 connector,

Now, on our TV, it should appear exact copy our computer desktop. But again there is nothing, the same error appears on a black screen. So we go to the “Screen Resolution” settings. Right-click on the desktop and select “Screen Resolution”.

As we can see in the window that appears, our main screen is set to the second (2) Samsung SyncMaster 971P monitor, and in the “Multiple Screens” parameter we have set “Display desktop only on 2 monitor”, which is why the image is only present on the computer monitor screen, but it's not on the TV


We bring everything in this window to this state. Select a parameter
Multiple screens: "Duplicate these screens"
In the “Screen” parameter, “Multiple monitors” is automatically set, click Apply and OK.

The desktop of our computer appears on the TV.

The resolution of our small Samsung TV is 1366 x 768. If your computer monitor supports this resolution, then it will automatically be set to the same resolution of 1366 x 768. If not, then either the TV or monitor will have the wrong resolution. For example, my Samsung SyncMaster 971P monitor has a maximum resolution of 1280x1024. When using a TV and a computer monitor at the same time, the main thing for me is to set the resolution on the TV correctly, otherwise why would I connect it then. I put it on Samsung TV The resolution is 1366 x 768, the image is perfect.

And on a computer monitor such a resolution of 1366 x 768 looks like this.

And nothing can be done here. If you want the perfect image on your TV and computer monitor, then they must support the same screen resolution, that is, have the same characteristics. There is no sound on the TV after connecting the TV to the computer via HDMI Friends! Don't forget that the HDMI interface transmits video and sound over one cable, and we can specify in the operating system settings to use the TV's built-in speakers for sound output.
Let's fix the problem by using a TV instead of a monitor. Go to Start->Control Panel->

Hardware and Sound->Sound

If you don’t have anything in this field, right-click on an empty space and in the menu that appears, check the “Show disabled devices” items. "Show connected devices"
Now we look at the name of our TV, in my case it is Samsung, we need to turn it on and turn off the rest. Right-click on Realtek and select Disable.

We also turn off the speakers.

Samsung – Enable, Apply and OK.

Today, most home video systems, including plasma TVs, have high resolution, video projectors, Blu-Ray players, network media players, satellite receivers and the like, HDMI is used for signal transmission. This protocol was developed to facilitate the transmission of high-quality video and audio.

It also features HDCP copy protection. Components connected via HDMI must be able to recognize each other and exchange service information. The latter is often called the "HDMI handshake". If you're trying to figure out why HDMI isn't working, it's possible that one of the devices can't recognize the HDCP overhead sent to it by another component. As a result, we see nothing on the TV screen.

When faced with the problem of connecting devices via HDMI, I recommend checking a few simple things that, with high degree chances are they will help you.

Troubleshooting HDMI-DVI or DVI-HDMI connection problems

Difficulties often arise when connecting two devices, one of which has an HDMI port and the other a DVI port. In this case, an HDMI-DVI adapter cable or a separate HDMI-DVI adapter is used, placed at one end of the DVI or HDMI cable. Additionally, the device with a DVI port must be HDCP compliant. This is prerequisite connection of two devices.

You should also remember that while HDMI can carry audio and video, DVI is only for video. This means that for transmission soundtrack you will have to use an additional cable.

  • In most cases, video is transmitted via the HDMI-DVI connection without problems. If video transmission does not work, then the most likely reason is that the
    walker If you try several models, the issue may resolve itself.
  • But if the TV model is old enough, its DVI port may not support HDCP. In this situation, try downloading and installing the latest firmware. It is also worth trying to transmit the signal from this source to another receiver. The problem may be with your player, laptop, or receiver.

Connecting a laptop/computer to a TV via HDMI does not work

More and more users are starting to use a computer or laptop as a signal source. Problems may arise here too. If you cannot connect your laptop/PC to your TV, then check in the system settings whether HDMI is used as the video and audio output. If you still don’t understand why it doesn’t work, then try the following:

  1. Connect the TV and computer with a cable, and then restart the latter.
  2. Try turning on or restarting your laptop or computer and only then turning on the TV.
  3. If this does not work, then turn on the computer, then turn on the TV, and after that, connect them with an HDMI cable.
  4. If this does not help, then (if the TV has such an input).

Notes

In the vast majority of cases, the problem with signal transmission is associated with an insufficiently reliable connection between the contacts of the HDMI cable and the socket. But the reason may be more complex. If you encounter a problem HDMI connections, then don’t panic, but carefully read the above recommendations, and everything should work for you.

Well, if this does not help, then contact the service for help. technical support purchased devices. If this does not solve the problem, then you are faced with a warranty claim - contact the seller.

And yet, if you are used to “looking to the future,” then immediately purchase an HDMI cable with throughput 10.2 Gbit. Today he won't give special advantages, but when TVs and signal sources with 4K resolution become cheaper, this cable will come in handy.