When buying a TV, be careful. You do not need unpleasant surprises? The product is technically difficult, and it is often difficult to return it to the seller. Many screen defects are not even considered a marriage. How to check the TV without taking it out of the store? We have prepared a small instruction. Of course, it is not necessary to follow all the recommendations. And not every seller will allow it. Focus on the situation.
- So, what should I look for?
- Looking for “broken” pixels
- Color interference with LED TVs
- What else is worth checking out?
So what should I look for?
First of all, make sure that the TV was kept in normal conditions, did not hit, and did not drop.
- Take a look at the packaging. Is the box intact? Are there any traces of moisture?
- Examine the instrument case. There should be no dents, scratches or other damage on the surface.
- Check the screws that secure the back panel.
- Make sure there is a screen protector.
- Consult the list of components( cords, remote, etc.).A complete list is usually provided in the instructions. Do not forget about the warranty card.
If the visual inspection is completed successfully, ask the seller to turn on the TV.Rate the quality of the image before buying is definitely worth it.
We are looking for “broken” pixels.
Pixels are the color dots that make up an image. Their number corresponds to the screen resolution. So, at a resolution of 1920 × 1080( Full HD) the display contains over 2 million pixels.
Each pixel is formed from several luminous points( sub-pixels).Most often there are three: blue, red and green. Sometimes manufacturers add a fourth color( black) - for better color reproduction.
For the correct display of the picture requires a coordinated work of all pixels. But sometimes one of them functions incorrectly, and the dot turns out to be a different color.
Standards allow for the presence of a number of "broken"( faulty) pixels. Repair them under warranty no one will. Therefore, it is better to know about such problems in advance, before buying.
How to check the TV for broken pixels? For a complete diagnosis, you will need a removable media that can be connected to the device. Also does not interfere with a magnifying glass.
Upload several image files in advance. Their resolution should match the screen resolution.
Prepare several uniform pictures( black, red, green, blue).With them, you can easily detect inactive pixels: they do not respond to the incoming signal. These points will glow in a different color.
There are still pixels that work incorrectly only periodically( when a neighboring point lights up in a certain shade).You can identify them with the help of patterned pictures: with stripes, a grid, and evenly alternating shapes. Incorrectly functioning elements will be allocated in the general row.
Sometimes defects do not appear immediately, but only when heated. You can see them only if the device works for some time.
Color interference with LED TVs
If you display a background with a uniform fill on the TV screen, no extraneous shades should be observed on the display. Alas, if we are talking about devices with LED backlighting, this rule is almost impracticable. Technology does not yet allow.
Most likely, the screen will be defective. Faults are divided into three types: light, tint and banding. Consider them in more detail:
- Tint - these are spots and stripes that appear when white is displayed incorrectly. When showing videos, they are often invisible: the picture quickly changes. But if you decide to have a slide show or play a video game, this kind of problem may interfere. To identify this problem, use backgrounds with a gray or white uniform fill. Submit the appropriate image to the TV screen. Tint usually appears in the form of greenish or pinkish spots on the edges of the display.
- Banding - strips that have a different shade. Sometimes visible even when playing video. Manifest on homogeneous areas during camera movement.
Check for the presence of banding in a similar way - download a monophonic image. Background colors can be any.
- Highlights. This word is called the defects of the LED backlight itself. It may be brighter or dimmer in different parts of the display. If the deviations are small, it does not interfere with normal viewing. Alas, you may not be allowed to check the TV right in the store. This should be done in a completely darkened room. But if you can, turn off the lights and close the curtains.
Disable all features that enhance image quality( level adjustments, dynamic backlighting, etc.).Set the most vivid viewing mode. Often it is called "dynamic."Then upload a black drawing with small bright details( for example, a frame with the captions of a movie).Watch better from a distance. Pay special attention to the corners.
Tint, glare and banding - no marriage and no breakage. Finding LED TV without them is almost impossible. But the intensity of interference is different. When buying, try to choose a device with minimal defects.
What else is worth checking out?
Pick up the remote control. Inspect it, try out the buttons. Does the TV respond quickly? Excessive sluggishness sometimes indicates software problems or some other malfunctions.
- Check connectors. The store should have a lot of peripheral equipment.
- Turn on the sound. From the speaker should not be heard creaks.
- If possible, try out the 3D glasses, make sure the synchronization is successful. Of course, if the device supports the corresponding function.
- Try to “catch” Wi-Fi. Networks are almost everywhere now. You can search for them from the phone in parallel.
Well, and finally, advice: behave confidently. It is better to spend the extra half hour before the purchase than to arrange the proceedings after. This will save your nerves and time not only for yourself, but also for the store employees.
We hope our recommendations will help you buy a good TV, without “broken” pixels and other unpleasant flaws. Good luck!