LCD device buyers often experience blackouts in some parts of the screen. This affects not only televisions and monitors, but also laptops and tablets. The leading manufacturer of LCD panels at the moment is Samsung, it also manufactures them to order for other companies. But the amount usually builds up to the detriment of quality, and often in reviews there are messages about dark spots on the Samsung LCD TV screen. In fairness, it is worth noting that such artifacts can be found on products of almost any brand and price segment.
Dark stains
In addition to factory defects and the influence of low-quality components, there are cases of darkening on the display due to mechanical damage. Such defects look completely black with clear edges and cracks. After some time, blurry edges may appear. This is the result of overheating of neighboring pixels. In this case, there can only be one piece of advice - replacing the matrix. Due to the thinness of the LCD panel device, it has a very low maintainability, and its replacement is much easier, cheaper and faster. In addition, this method will help solve the problem of dark spots on the LCD TV screen in the bud.
Darkening on a white background
Uneven white luminescence of the matrix is a sign that the plane of one or more inner layers or their uneven pressure on each other is broken. Often this does not occur immediately after the purchase, but after some time. Indeed, due to the poor quality of materials or assemblies under the influence of heating, the geometry of the part is violated.
Also, due to poor-quality layer protection, dust can get into the matrix. When heating and cooling the panel, it expands and contracts, respectively. She, like a pump, can draw in dust.
From the point of view of manufacturers, such "sores" can be explained by a craving to reduce the cost and simplify the design and components. And you can fix this with a simple purge. But it must be carried out as carefully as possible, since it is impossible to remove a dent or scratch inadvertently left on the panel.
Matrices with such defects are easily accepted by service centers to replace defective parts under warranty. Also, manufacturers can conduct recall campaigns when low-quality components are installed on entire batches of devices. By the way, the appearance of dark spots on the screens of LG LCD TVs is also not uncommon. In the production of components for other manufacturers, some go almost on a par with Samsung.
Moisture stains
If a dark spot appears on the LCD TV screen, this may also be due to liquid entering between the matrix layers. Outwardly, they are almost identical with dust spots. Therefore, for self-diagnosis of a malfunction, you need to think about where and how moisture got into the TV or other display.
Theoretically, this problem can be solved by disassembling the matrix and washing the polarizer and diffuser. Of course, washing should not be carried out with tap water, since after drying stains from salts and deposits will remain. For this, purified water or highly purified alcohol is more suitable.
But it’s better to entrust such procedures to qualified specialists, since during disassembly or assembly of the matrix you can cause irreparable harm to the device. If you decide to do this yourself, then disassemble and assemble it is necessary in a clean room, preferably after wet cleaning, so that dust particles do not fly in the air. It is also necessary to wear gloves so as not to leave fingerprints on the components of the matrix.
Spots in corners or around the perimeter
Dark spots on the LCD TV screen may have a different origin, and the cost, as well as the possibility of repair, may be different. If dark oval or round stains appeared around the perimeter or at the corners of the screen, then most likely a part of the matrix LED backlight failed. This defect is often found on TVs and monitors of Chinese manufacturers of the budget price segment. Such a breakdown can be easily fixed by replacing the burned-out diodes. In some cases, soldering the backlight contacts may help.
Trash inside the matrix
It happens that during transportation or during the assembly of the TV, dust and various small debris get between the matrix layers. The topic forums described a situation where a fly appeared to be a dark spot on the Samsung LCD TV screen that had just been brought from the store. The owner of this find immediately contacted customer support. The answer was that the fly got inside the screen through the ventilation holes in the case, made to cool the components. And the company is not liable in the event of foreign objects falling through them. Users on forums suggest tapping the sides of the monitor as a solution to this problem, in order to slightly push the display layers apart and let the dust fall down, or lightly tap the monitor with a thick cloth, as if "knocking out" it. But do not get too carried away with this method so as not to lead to the breakdown described in the first paragraph.
To summarize
So what to do if dark spots on the LCD TV screen prevent you from enjoying the picture? Which of the cases are warranty, what can you decide on your own, and where can you do without going to the service? We list all the options:
- Black spots from mechanical damage. This case is not a guarantee, and this can only be fixed by replacing the matrix.
- The same spots, but without traces of impact. It may be possible to pass it under warranty if there is a trace of mechanical stress on the case and screen.
- Dust It is likely that they will be accepted under warranty in the event of a marriage of the party. But you can also rinse one or more layers. True, self-intervention automatically removes the warranty from the device.
- Moisture Initially, this is not a warranty case, but the same flushing can help, as with dust.
- Failure of the backlight LEDs. The case is a warranty case if there are no signs of tampering on the case. If the warranty has expired, you can replace the blown diodes or the entire tape.
- Trash between the layers. In the absence of signs of opening, this is a warranty case. But you can fix it yourself by blowing the matrix.
I want to note that this article was informational. If dark spots appear on the LCD TV screen, it is best to contact qualified craftsmen.