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Does your TV show anything but a black screen even though the audio is working? Unfortunately, this is a common problem with low/mid-range LCD/LED TVs these days… Most frustratingly, this problem is often caused by small, cheap parts that can be replaced. The most common problems are:
One of my relatives experienced the same symptoms. Problems with cheap TVs are common in the first few years. The cost of repairing such a TV is quite low, so it might be worth considering doing it yourself!
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The first step to repair is to find the root cause of the problem. Backlight failure is a very common problem, so this is the first thing to check. The easiest way to do this is to turn on the screen, put the flashlight very close and check if you can see the image. Changing the screen brightness to very low, etc. will make the picture very dark.
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Now that the picture itself is good, that means the main board is probably good, so we’ll check the backlight system itself.
This means you have to disassemble the TV to access the backlight, which sits between the front LCD screen and the rear panel. For my Samsung F5000, I had to process as follows.
First, we need to remove the rear housing (from left to right: main board, T-CON, power supply) to open the board and separate the LCD board from the T-CON board.
Turn the TV over to remove the front housing and LCD panel. The plate is very fragile, so be careful!
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Here we can see that the backlight system is made of LEDs that are simple enough to replace in case of failure.
Note: Older TVs have fluorescent tubes for backlighting, which are thicker and less likely to be damaged. Although LED backlighting is very popular these days, LED TVs should not be confused with OLED TVs. The first is a classic LCD panel with an LED backlight, and the second is an OLED panel that does not require a backlight because it is integrated into each pixel (making components more expensive).
As we can see, the backlight system is made of 5 LED strips. The first thing to do is to look for a burnt LED. In most LED backlight systems, the strips are installed in series, which means that if one fails, the entire system will go black…
Note: If you look closely, one will look different than the other! 3rd strip from top, 6th LED from left. We will try it soon!
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With the help of the multimeter, we were able to confirm that the strips are indeed connected in series, so now we need to test each strip individually. Professionals use an LED tester like this (about $40 on Amazon), but I didn’t have one at the time, so I decided to do it McGyver style!
To turn on one such LED, an input voltage of 2.5-3.6V is usually required. Looking online for this model, I found that the model used in the strip requires 3.6v; So there are 9 LEDs per strip: 3.6 x 9 = 32.4v input voltage is required to illuminate one strip. This is the maximum voltage we don’t want to pass, otherwise the LEDs will be damaged during testing.
So I took the 3 9V batteries that were in the drawer and assembled them into a virtual 27V (3 x 9V) battery. It’s less than the optimal 32.4v needed, but not too low, maybe light up the strip a bit to determine which one isn’t working. The settings are as follows.
The problem with 9V batteries is connecting them together! So all you have to do is put a wire on both ends.
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Now we just need to test each strip individually to make sure they are glowing. For each incomplete, this means that there is at least one defective LED.
After repeating this process for all the strips, I found only 1 faulty LED, as the backlight looked burned out when I first looked at it (strip 3 from the top, LED 6 from the left). To better understand what a burned out LED looks like, here are 2 pictures: burned out and OK. That thought
To begin with, I’ll use a third party to make sure there aren’t any other problems with the TV, but after that, it’s best to replace the LEDs with new ones, otherwise you may end up with dark spots on the picture.
Normally we need a heatsink to remove the LED properly, but I didn’t. So after a few tries with the hair dryer I ended up with a mess and soldered the wires underneath.
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Once we get past the LED, we can turn on the TV. Be careful! High voltage (200-300v) flows through the TV when plugged in, so be careful not to get an electric shock!
Now all we have to do is unplug the TV, replace the LEDs with new ones, and plug everything back in. Just to be sure, we should restart the TV and see if everything is fine.
There can be many other root causes for the same symptoms, and black screens often look like something serious enough to be expensive to fix, but this case is a perfect example of how taking the time to find the root cause can sometimes pay off. surprise: $1 fix here! Friends, today in this article I will give you some important tips for repairing LED LCD TV. This material will help you learn how to repair LCD LEDs and practice in the field. This knowledge can be used as a hidden LCD LED repair technique.
Although this is not a comprehensive essay on LCD TV repair, we hope that it will help readers understand the basic functions of the important panels found in LCD TVs. Let’s get this party started.
Half Screen Tv Problem
Television is a very personal thing in our daily life. It not only entertains us and informs us about what is happening in the world, but also brings together families from different households to watch their favorite movies and TV series. Although we live in the age of mobile devices, there are still many people who prefer television to mobile phones. It’s obviously scary when your beloved TV screen cracks.
But it is a rare case that the TV screen is broken. However, if this happens, no random mechanic is assigned to fix it. But only people who are really familiar with the work will be registered.
Power Board: Inside an LCD TV, the power supply board is generally the largest and heaviest board. Some repair professionals refer to the power supply board as a “Power Supply Unit”, “Power Supply Module” or simply “PSU”. It converts the basic AC current into DC voltage that can be used in the LCD TV circuit.
The power panel and inverter panel are also called I/P panels. No power, low power, flickering power, and no power outages are common problems.
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Timing Panel (T-Con Panel): The T-Con panel is the smallest panel in LCD TVs and is generally only found in LCD TVs. The T-con board’s job is to handle the gate and source logic signals that drive the TFT LCD. T-Con boards are known by various names such as “Control Board” and “Control Board”.
White screen, no screen, double images, and screen distortion are common problems (black and white vertical bars on the screen). You can see several vertical and horizontal lines on the screen.
Inverter boards: Inverter boards are only found on LCD screens and are generally located on the edge closest to the TV panel. The purpose of this board is to convert SMPS (12V or 24 V) low voltage DC to high AC (500-1500 Vrms) to power the backlight. This board is available as a single board or as an integrated I/P board with power board.
Searching for circuit boards with audio and video inputs and outputs is the simplest way to find a motherboard. Motherboard, Main Unit, Digital Board, Scaler Board, A/V Board, Main Module, Logic Board or even A/D Board are terms used to describe the motherboard. Its job is to take visual and audio inputs and convert them into digital signals that can be sent to the T-con board via the LVDS (low voltage differential signal) IC.
How To Fix Lcd/led Tvs Black Screen
Common defects include no screen, no color, full screen with vertical lines after a while, no sound, horizontal lines and blocks. LCD TV error (usually
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