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Tel/Wechat/Whatsapp +86 13926285591
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Email hanke@opeetv.com
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Tel/Wechat/Whatsapp +86 13926285591
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Email hanke@opeetv.com
TV Inspection Guide 2024
Although the Internet is very advanced nowadays, and most people prefer to use their cell phones to get information from the Internet, people still need a TV set “bigger than a cell phone” to learn about humanities, politics, and geography around the world. As a TV factory, we offer this article to teach those who buy and sell TVs wholesale, or an end-user consumer, what specific tests to look for when inspecting a product (one unit or wholesale). This article will help you to stay away from bad televisions!
Preparation Before Inspection
If you are a customer who buys televisions wholesale and you have ordered from a factory, then you need to make some preparations to go to the factory to check if the television is of good quality.
- Determine the signal sources – Various video and audio signals, WIFI signals, etc. Understand what is the desired product in mind. It is necessary to know the function of this TV set, if you buy a batch of ISDB-T TVs, but the actual factory gives you a DVB-T2 motherboard, then the TV set can only be used as a monitor.
- Prepare devices to test further (e.g., headphones, USB flash drives, etc.). Prepare some professional, your favorite test videos to a USB flash drive, and then play them on the TV for testing.
- Figure out the power(Voltage, frequency, and plug type). Usually, the factory will provide the proper supply voltage to start this TV, you can ask them to use the supply voltage of the target end country, and the plugs will be tested.
- Determine the test environment. If you need to test the brightness of a sample, then it would be better to move it to a dark room; if you need to test the sound quality, then move it to a room without a lot of noise.
- Ask the factory to provide the LCD specification. Need to confirm what brand the LCD is and when it was manufactured. LCD screens account for at least 40% of the cost of a TV set, and if a factory is not willing to give the model parameters of the LCD screen, chances are it is using a bad-quality LCD screen.
Workmanship - Exterior Inspection
Good workmanship shows how much effort and emotion a TV factory puts into making TVs. Conversely, a poorly made TV will have flaws in the details.
As a custom TV factory, we will provide some “details” to determine how “elegant” a well-made TV can be.
TV body exterior check list:
A checklist to help quickly locate cosmetic defects on your TV
- Bump: The surface of the TV is deformed due to external damage.
- Scratches: There are scratches on the surface of the TV due to external damage.
- Loss of paint: The phenomenon of paint peeling off or revealing the substrate after the TV casing has been damaged by bumps and abrasion.
- Missing corners: concave holes that appear on the original regular edges of the TV casing after being damaged by bumps, wear, etc.
- Deformation: The shape of the TV casing changes due to external forces.
- Gaps: cracks at the original joints when the fuselage parts are assembled and shipped from the factory.
Accessory Packaging
Few people notice the packaging of TV accessories (feet, remote control, batteries, manuals) because consumers buy them and then take them out and throw away the packaging. However, a well-arranged TV accessory package will ensure that the accessories inside are not shifted after transportation. On the other hand, if you put the feet and remote control in the same package, if there is any shaking during transportation that causes the feet and remote control to shift and rub together, then this is something that no one wants to see. Therefore, the packaging and design of accessories is a detail.User Manual Content Checking
The instruction manual may also be an unassuming accessory, but there really will be end consumers who will go through the manual to learn how to use the TV. A good instruction manual needs to be written, correctly laid out, and free of typos in the language. Some manufacturers may have paired the wrong model of instruction manual or printed the wrong language. We need to make sure that the details are correct word by word and line by line before we can make this batch of televisions of the right quality.Packaging Confirmation
Packaging boxes for TVs are mainly divided into two materials – kraft boxes and colored boxes. A conscientious TV factory like ours will have the colored boxes treated for moisture. If your shipment of televisions is exposed to moisture (a large temperature difference) during transportation and the box is not moisture-proof, then when the televisions arrive in your hands, the paint on the box will be stained and very unsightly. In addition, the size, symbol, and configuration of the package must be confirmed to be correct before passing. A very extreme example would be if there was a 1mm error in the package size, which would also result in a different amount of cabinets being loaded. 2,700 32″ TVs packaged with an extra 1mm in length might end up with only 2,650 32″ TVs being able to fit into a 40HQ container without any problems.LCD Panel Confirmation
LCD screens take up roughly 40% of the cost of a TV set. As a buyer, we need to measure the LCD screen. Some of the “thunder spot sizes” are likely to be found in 43″ and 60″ TVs. In order to save costs and get higher profits, some factories will produce 42″ or 58″ TV for customers to pretend to be 43″ or 60″ TVs. If we have a ruler with us, we may want to use it to measure the true size of a sample TV set. On the other hand, we also need to confirm the resolution of that LCD panel. A 4K TV may be replaced by a 2K TV in order to get more profits. In addition, we need to confirm the specific LCD model with the manufacturer. Usually, IPS will be so much more expensive than VA screen, then bad factories may also focus on the profit. We just need to press our finger on the screen, the water ripples appear is the VA screen.“Default” Setting
Default settings contain a very large number of details that often go unnoticed by the end consumer.- Default color temperature of the display – Consumers in different countries have different preferences, with some preferring cooler colors and others warmer ones. As a TV factory, the only thing we can do is to communicate with our customers and use their local market knowledge to confirm which color temperature is preferred for the picture. Few factories realize this, because their engineers will move the color temperature closer to 6500K and avoid too warm and too cool.
- Reset function – A quick test, reset the TV to confirm that the default language is the first language (usually controlled from the motherboard level); will there be any other issues after the reset, such as brightness not being able to be modified or something like that.
Drop Test
Drop testing is an important part of the production process because TVs are often a large and heavy product and the LCD glass is very fragile. If the product is blindly transported to its destination without having been drop tested, the defect rate of the batch of televisions will be very high. Please note: We need to get the “drop test” permission from the factory. Our goal is to REPRODUCE general drop scenarios and bumps in transit to test whether the packaging of a TV set can be properly cushioned to protect the TV set.Running Test
Next up it’s time to fire up a sample TV. It is important to note that you should place this TV set in a suitable environment, such as a small room where a dark environment can be constructed, and let the TV set run for at least 30 minutes.Color Performance Test
We have several devices to choose from, and generally, we can ask the factory to provide a “color colorimeter.” This colorimeter can help analyze the brightness, and color gamut of the screen. A good engineer would have tuned the default configuration of colors for this batch of televisions, as well as their brightness optical scheme.Keep some basic ideas in mind:
- Brightness: Information about the brightness of the screen. It is measured in candela per square metre (cd/m²). Because a LCD TV must has the backlight component, and it is necessary to test the brightness in 2 ways. The first thing to note is the maximum brightness. Maximum brightness is usually laid out right in the middle of the screen, since the center is where all the backlight bulbs intersect. The maximum brightness determines the upper limit of the display of this TV. A TV that is bright enough to withstand indoor light conditions; on the contrary, if it is not bright enough, then this TV will be dull in the room. Testing for uniform brightness requires only a few simple steps. We divide the screen into 3*3 with a total of 9 areas, then use colorimeter to take the value in the middle of these 9 areas, and finally take an average value to get the uniform brightness. If a TV has good uniform brightness, then we will get a better look and feel in a solid color picture (such as white). Some TVs usually use poor quality diffusion films (usually these films have defects in uneven materials), and we can tell with the naked eye that the “pure white” picture is not pure white.
Additional information I: Please do not blindly pursue the maximum brightness, as blindly pursuing maximum brightness will sacrifice other effects. For example, a TV may have a preset that will raise the brightness to 300 cd/m^2, but this will make the overall picture whitish at the expense of color reproduction. Additional information II: Which backlighting technology is used in the TV? Is it ELED(Edge) or DLED(Direct)? Typically smaller TVs, up to 40 inches in size, use Edge LEDs. The strips are distributed on the edge of the housing, while larger sizes, or those looking for a high-brightness solution, use DLEDs, or even miniLED backlighting. The number of bulbs and their power affect the brightness, which passes through the optical film and then evenly through the LCD glass. - Color gamut: A color gamut is a collection of displayable colors. Typically it is a triangular area, with the “vertices” of the triangle measured by a colorimeter that indicates the red, green, and blue colors displayed on the TV screen. In the television industry, it is common to use the NTSC color gamut standard for comparisons. For example, a TV set with 72% NTSC color gamut indicates that the TV set covers 72% of the NTSC color gamut. High-end televisions will use the DCI-P3 color gamut in order to show that their TVs have great colors. Additionally, LCD TVs can enhance their color gamut by adding quantum dot technology; a combination of blue light led backlighting with a yellowish quantum film that produces a photoluminescent phenomenon. After the blue light is absorbed by the quantum film, the quantum film disperses a purer light (meaning a wider color spectrum), thus enabling the TV to achieve a wider color gamut. We do a color gamut test and want it to cover a wider color gamut, which would indicate that the TV is displaying better colors.
- Color Depth/Color: Usually we see these numbers, 16.7M and 1.08B, 8-bit and 10-bit; in fact, these numbers are the same idea. 1 bit means one each of R,G,B, total 3 colors. 2 bit means R,G,B Each color can be divided into 2 layers and can be matched with 8 colors. 8 bit means R,G,B each color can be divided into 2^8 times, i.e. 256 colors, three 256 colors can be matched with 16777216 colors, i.e. 16.7M. 10 bit means R,G,B each color can be divided into 2^10 times, i.e. 1024 colors, three kinds of 1024 colors can be matched to produce 1073741824 colors, i.e. 1.07B. An LCD screen that supports more colors, such as 10-bit vs 8-bit, will make color transitions more natural. All we need to do is open an image that comes with a color transition and then make sure the TV has a natural color transition.
- Bright/dark dot detection: A bright dot is a defection that a single pixel keeps being a static color while the other normal pixels can successfully perform. A dark dot is a defection that a single pixel is “dead” while the other pixels are light-up. In the television industry, we use the bright dot to differentiate whether an LCD screen is A-grade or A- grade, because the bright dot has a greater impact than the dark dot. If we order a batch of A-grade TVs, there will never be any bright dots on the screen, and some dark dots are acceptable. The detection method is simple, using a pure white screen to see the dark dot and a pure black screen to see the bright dot.
- Light bleed and color uniformity: Light bleed refers to the part of the light from the backlight that leaks out at the four corners of the TV under a purely black screen. This is an unavoidable problem of LCD screen, and a good TV factory should minimize the impact of light leakage; the detection method is very simple, we just need to find a very dark environment, and then display the LCD TV in black, then we can see some light is leaking out from the surrounding. Color uniformity is a little bit similar to brightness uniformity. We can use static color and see if part of the area is off-color.
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FAQ
Are you the TV manufacturer(factory)?
Yes, we are. We are an LED TV OEM factory with 20 years of experience. Welcome to share your ideas with us. It’s our pleasure to provide the best TV solution for you.What is your MOQ requirement?
Our MOQ is one model per 20GP and two models mixed loading in one 40HQ. Sometimes our MOQ is flexible, half of a 20-GP container is acceptable.Is it possible to buy a sample?
Yes, it is. A sample is available to buy. However, our sample may charge double the normal price, which includes the following two parts:- Customization and testing fees – The additional fees cover the engineering costs for us to customize and test the product according to your requirements.
- Sample deposit – An extra unit price is collected as a deposit. Once you place a formal bulk order after the sample order, we will deduct this deposit amount from the total fees of your bulk order.
How long is the delivery time & Warranty?
Mass order: 30 days after the deposit arrival and artwork confirmation. Non-customized Sample: three days. Customized Sample: 7-10 days. Warranty: 1-year by default. Extra cost for extension.We are looking for long term customers and we will offer the best price!