I bought a new Konka 42-inch LCD TV, and I feel the picture is very poor. What is the reason?

I bought a new Konka 42-inch LCD TV, and I feel the picture is very poor. What is the reason? cannot

A 42-inch TV must be 720P or even 1080P to avoid blurring. Of course, if you stand far, you won't say anything.

The commonly used high-definition network TV is only 360P P p.

For example, playing a 360P movie on a mobile phone will not blur, but the same pixel is clear on the mobile phone, that is, the mobile phone is small.

Playing over 42 inches is bound to be blurred.

It is recommended to connect the network cable at home, use the network TV box to support HDTV, and use the HIDI interface to play TV.

Is the STB a digital TV? Throw that thing away. It seems that you have to pay hundreds of dollars every year.

What is the reason why some LCD TV power supplies of Konka have no pictures? In fact, this sudden black screen phenomenon is just that the backlight goes out. Indeed, this kind of fault is very common in LCD TVs. Due to the price reduction of LCD TVs, many LCD TV manufacturers buy LCD screens in the form of bare screens, and then choose their own LIPS power supply (that is, the power supply board and high-voltage backlight board are combined into one) to reduce costs. The design of LIPS power supply is not perfect, and there are often unsatisfactory states: overvoltage/undervoltage protection, overcurrent/undercurrent protection, lamp open/short circuit protection, over-power protection, etc., which will cause sudden black screen failure.

Because you didn't provide the size, brand and model of your LCD TV. So I can't help you judge the specific details and maintenance price of TV. Of course, I can tell you for sure that the probability of power failure is far greater than the probability of screen failure. Maintenance is difficult, and the cost is around 300 yuan.

In LCD TV, the backlight principle is adopted, the lamp tube is used as the backlight, and the light is controlled by the auxiliary optical module and the liquid crystal layer to achieve the ideal display effect. Liquid crystal is a regularly arranged organic compound, which is a substance between solid and liquid. At present, nematic thin column liquid crystal with molecular arrangement is generally used, which is most suitable for manufacturing liquid crystal displays. Liquid crystal itself cannot emit light. It mainly changes the molecular arrangement of liquid crystal to display images by generating electric fields through voltage changes.

LCD material:

The liquid crystal panel is mainly composed of two pieces of sodium-free glass, and the interlayer is composed of polarizer, liquid crystal layer and color filter. The surface of LCD screen looks like a solid black screen. In fact, the manufacturer will add a special coating to this screen. The main function of this special coating is to prevent users from being reflected and dazzled by other light sources when using, and at the same time enhance the color contrast effect of the LCD screen itself.

But because the coating materials used by different manufacturers are different, of course, its durability will be different. Therefore, when cleaning, users should never wipe the screen surface with any alkaline solution or chemical solution at will.

Knowing the above concepts and principles about LCD screen, I believe we can understand and deepen our maintenance consciousness more clearly when reading the following knowledge about LCD maintenance.

What is the reason why the old Konka 42-inch LCD TV 12v is not powered? To solve this problem, first measure whether the voltage at the output end of the switching power supply circuit is normal; .

(2), if the measurement is normal, then this fault will measure whether the power supply voltage on the signal board is normal.

③ If the power supply voltage on the signal board is normal, measure whether the DC-DC voltage conversion circuit chip on the signal board and the terminal voltage of each output are normal. If it is normal, check the CPU standby control circuit elements on the signal board.

The remote control of Konka LCD TV consumes a lot of power. What is the reason why the remote control is flooded? See if the remote control works. Another is that the remote control is leaking electricity.

What is the reason why the backlight of Konka 32-inch LCD TV is not bright? First measure this fault. Is the power supply voltage of the logic board circuit normal: 3.3V, 15V, or 12V?

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(2) If the measured power supply voltage of the logic board circuit is normal, measure whether the ground voltages of all DC-DC voltage conversion circuit chips on the logic board are normal. If it is abnormal, check the components around the abnormal pin of the chip.

The green indicator of Konka 42-inch LCD TV is on, but there is no sound. What is the reason? Dear users: Hello! Thank you for your support of Konka products! I'm sorry for the inconvenience. I suggest you try the standby button on the remote control or the "+"button on the TV to see if it can be turned on, or try turning off the power and restarting the machine. If it still doesn't work normally, you can contact our after-sales service if necessary. Please refer to. If necessary, you can consult online in official website. Thank you for your consultation and wish you a happy life!

Why doesn't Sharp's 42-inch LCD TV turn on? Solutions;

1. Check whether the TV is turned on and the power button is turned on. If you don't turn it on, turn it on and the problem will be solved.

2. Check whether the power button of the TV remote controller is pressed to turn off the screen display of the TV, so that the TV is in standby state. Press the power button of the remote controller again to start the screen and return to normal;

3. Check whether there is any problem with the signal source input of the TV set, such as whether the connection between the TV set and cable TV signal, digital TV signal or DVD player is normal. After normal connection, switch the TV to the corresponding signal source mode and return to normal;

4. After the above methods are checked, the TV still doesn't respond. Generally, it is judged that the TV is unresponsive because of hardware failure, including motherboard switch circuit failure, screen line failure, screen failure, other parts failure and so on. It is recommended to contact the after-sales service of the TV set to conduct a comprehensive inspection and warranty of the TV set.

What is the reason for Konka LCD TV's repeated standby state? Dear users: Hello, thank you for your support to Konka! According to your description, please check whether there is an automatic on-off or time switch machine selection in the TV. If yes, please turn off this function. If not, please contact Konka's after-sales staff for service, or visit Konka's website for online registration and maintenance services. Thank you for your consultation and wish you a happy life!

Konka 26-inch LCD TV does not turn on. Why did it open? If there is no response, it is likely that the power board is broken. When the light is on, it may be that the power board is broken, but it doesn't respond when the light is on. It may be that the decoding board is broken.

A: If I repair it, I shouldn't need to replace the parts. The cost depends on the size of the TV. Q: Can you fix it for me? It's a 32-inch Konka. Answer: I'm in Buji, Shenzhen, and the charging is low. If my charge is around 100, people with black hearts may ask: Can you teach me how to repair it? My home is so far away from yours, or I'll ask you to fix it. Thank you. Answer: If you need professional knowledge, you should pay special attention to safety when disassembling the machine (the power cord is unplugged and the power supply part is still live). After opening the TV cover, remove the screw of the high-voltage lamp tube, take out the high-voltage lamp tube and check the ignition position of the lamp tube. Wrap the wire at the ignition position with insulating glue (don't wrap it too big), then put it back in the lamp tube and turn it on to see if it will ignite. If it doesn't light, just cover it and ask. I don't have any insulating glue. Let's find a repair shop.