How to Test a LED TV Screen with a Multimeter or Tester - Technical Tutorial

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Test a TV's LED screen with a multimeter in a simple way it can be quite a useful task. TVs have become a widely used tool in recent times.

Since the creation of new technology in televisions, such as the "Smart TV", other equipment has been replaced, mainly secondary devices such as: DVD and Bluray.

Those who have a "Smart TV" do not need to use the aforementioned equipment, as they enjoy Internet access, from there they can download any type of content, such as games, applications, films, series among others.



Index ()

  1. Is it possible to measure the voltage of an LED?
  2. How do you use a tester or multimeter?
  3. How can I examine the LED lights on my screen with a multimeter?
  4. How to improve the picture quality of my TV with LED control?
  5. How to know if the internet connection of my Smart TV is slow?

Is it possible to measure the voltage of an LED?

The LEDs have a common feature that unites them, and it is referred to as joint voltage, based on it the division of the LEDs is made. Measurement is possible, that's why it is necessary alone a device capable of measuring the voltage of junction , whose output voltage will be between 9V and 16V. But this is achieved with the direct use of the multimeter or tester.

Its use is simple, since it just requires calibration to get the exact details on what you want to measure. Now, all the calibration is already done in the factory, so you only need to detail which aspect you want to measure, remember that there are several multimeter presentations on the market with more advanced functions than others.



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However, its use is generalized on the connection action between the equipment and the element to be analyzed or measured, therefore the tips of each terminal are placed in the resistor who will be the subject of the measure; once connected, it is positioned on the symbol whose value or voltage you want to know.

How can I examine the LED lights on my screen with a multimeter?

Testing the LED screen of a TV with a multimeter in a simple way seems to be one of the most used tasks by a technician. To do this you need to find out about the TV and determine whether it is a Smart TV or a regular TV.

Furthermore, you should have a multimeter handy , then you should search the display datasheet to find the positive and negative cables, and if they have a pin connected to the display's millions of LEDs.

Set the multimeter or tester to the diode test function, then locate the pins on the screen, connect the leads of the multimeter in the indicated location , positive and negative.

Next, observe the screen as you connect the pins, you should be able to see a lit LED as well, remove the cables after each test and repeat the procedure until you have checked all the LEDs on the screen.

If you can't see the light in any of the LEDs , it means that it is not working and, of course, it is damaged. If a considerable amount of LEDs are damaged, you will have to discard the screen or change the TV.


How to improve the picture quality of my TV with LED control?

Test a TV's LED screen with a multimeter in a simple way and to check the picture of a television, are actions that television users must perform frequently. Knowing whether a TV is HD 4K or Full HD may be unknown, however to improve the resolution you need to know the model.


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There are occasions when a TV picture is not viewed in the best way, which causes a big problem for users, since prevents the use of any content.

You can try to go to your TV's picture setup, then, locate the 'Picture quality' option, if there is an active picture attenuator you need to turn it off immediately. If that's not the problem, find out if the mode "Energy saving" is active.


Disable "Energy Saver". However, if the image continues to look bad , you could try to go to the image resolution, selecting the highest resolution or the one recommended by your Smart TV or TV. If all of the above still does not show a positive result, it may be time to call for assistance.

How to know if the internet connection of my Smart TV is slow?

Testing a TV's LED screen with a multimeter in a simple way provides a way to occupy time. Instead, there are problems while surfing the net , especially when the user proceeds to connect the Smart TV to the internet.

One way to determine if a network connection is slow is to do it via a Smart TV, for this, you need to determine if it is not a problem with your internet provider. If not, go to your Smart TV browser.


Then, in the search bar digita 'Speed ​​test' , choose the page that attracts your attention from the search results, once loaded, start the speed test and wait for the results.

Before you can determine if your connection is slow, you need to know what kind of plan you have, to compare the results with the amount of 'Megabytes' that your provider grants you.

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Next, determine the difference between the speed test results and the plan you contracted, if the result is lower it means the internet is very slow.

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