How to check the TV when buying

Buying a new TV does not seem complicated. Especially now, when the range of TV receivers is huge. You just need to decide on the model of the device and the necessary functions. However, not all so simple. After all, before buying, you must completely check the purchased device. Moreover, this must be done in the store.

The first step is to make an external inspection of the device and the packaging in which it was stored and transported. If there are various dents on the box or it is generally torn in some places, then we can say that the TV got damaged during transportation. They can be both external and internal. The matrix of the device may also be damaged. If the box has already been opened, then most likely the TV receiver is either already in use or is a display case.

Once the seller has issued a box with the correct TV model, you must check:

• General condition of the box, whether there are dents, tears or other mechanical damage on it;
• Full availability of all accessories. With TV-receivers, the remote control from the TV, network cable, documents should be included. You need to inspect the remote control for scuffs or chips. A complete list of accessories is listed in the attached documentation. You need to check with him, as some models of TVs are additionally equipped with 3D - glasses, adapters or brackets;
• All protective films must be in place. As a rule, they glue the TV case and its stand;
• There should be no dust on the new device. If it is, then most likely the television was already in operation;
• All available metal or chrome inserts should not be scratched;
• Bolts located on the rear surface must not show signs of tampering. If any, the device was previously under repair;

It is also necessary to check the device for operability. To do this, you need:

• Connect the TV receiver to the network;
• On the switched on device, check whether the remote control that comes with the kit works;
• By connecting a television cable, you need to make sure that the TV scans and broadcasts the found channels;
• All available connectors must also be checked. These are USB, HDMI, Scart, "tulips" and others;
• Built-in speakers should not make extraneous sounds or various wheezing. The sound should be clear, and its volume should be continuously adjustable;
• The USB connector needs to be checked for reading various media files;
• If the TV has the Smart TV function, then you need to connect it to the Internet and make sure that all applications are working;

REFERENCE! If as a result of the inspection no defects were found, then we can proceed to check the matrix for the possible presence of dead pixels.

The image displayed on the TV screen is formed using pixels. Each of them consists of three colors: blue, red and green. Each screen resolution has its own number of pixels. So, with a resolution of Full HD 1920x1080, it is about 2 million. For Ultra HD TVs, this value will be approximately two times higher.

REFERENCE! Some manufacturers add a fourth sub-pixel color to provide better color reproduction.

Although at the factory - manufacturers, all manufactured products are thoroughly tested in many respects, a personal check for broken pixels will not be superfluous.

In order for the picture to be broadcast as it is required, it is necessary that all pixels work. If a crash occurs and one or more pixels fail, the dots at this location will differ in color from the overall picture.

The screens of modern LCD TVs consist of several layers, two of which are responsible for the operation of pixels. One layer consists of liquid crystals, the second contains special transistors. Microscopic transistors control the operation of crystals. If one or more of them fails, broken pixels appear. In the layer with liquid crystals, a break in the crystal leads to breakage.

To check for broken pixels, you need several single-color images. Images are preferably prepared in advance independently and brought with you on an external medium. Their resolution should be similar to the resolution of the TV receiver screen. You will also need a magnifying glass, since it is quite difficult to make out pixels, especially on a large diagonal TV.

REFERENCE! To check for broken black pixels, you need a white picture. For white - vice versa. You will also need an image of red, green and blue.

After displaying the desired image on the TV screen, using a magnifier, you must carefully inspect the monitor. Dead pixels will glow in a different color from the rest, since they do not respond to the signal that comes to them. It happens that pixels do not work correctly from time to time. An image with various patterned pictures will help to find them. Elements that work incorrectly stand out from the general row. Some defects in the work may not appear immediately. To detect them, the device needs to work for a while to warm up.

In addition to checking for non-working pixels, before buying a TV, you need to check for spots, as well as to assess whether the illumination of its screen is even. For this, you will also need a single-color image, which must be displayed on the screen of the TV receiver. When broadcasting, the display should not have different shades of different colors. That is, the screen should be uniform. However, LSD displays have some technological features that make achieving this uniformity very difficult. Therefore, manufacturers do not consider such a defect a sufficient reason for the return of goods. Similar faults with backlighting and spots are called tint, banding and light.

• Tint - these are various stripes that appear when the white color is incorrectly displayed at the edges of the screen. To identify this defect, you need to use a gray image. If there are greenish or pink stripes, then there is this problem. In normal television viewing, the tint is not noticeable. However, it can be inconvenient when viewing photos or gameplay;
• Highlights. With this defect, the display of the device is not uniformly illuminated. In different parts of the light intensity is different. When buying, such a malfunction is unlikely to be detected, since this requires a dark room. However, if the differences are small, this will not interfere with viewing;
• Banding. Like a tint, this malfunction is characterized by the presence of color bars that differ in hue from the main color of the picture. Become visible when filling a monochrome image;

All these defects are not a malfunction. LSD televisions, on which they were not, practically do not exist. However, they can be of varying intensity, which should be checked when buying a TV receiver.

When buying a TV do not rush. It is better to conduct a thorough inspection of the device in the store than to get your nerves and waste your time after acquiring an LCD receiver. Since most display defects are not reasons for a return or exchange, the check must be checked only before purchase.

IMPORTANT! It should be noted that a certain number of dead pixels is allowed by the manufacturer.

In addition to the above, you need to make sure that the TV is convenient to use, has a clear user menu, has all the necessary functions and a good viewing angle.