The sofa butlers after-sales maintenance of television black screen is a fault that we often encounter. Each TV will have a black screen. So what's wrong with a black screen? Today, Xiao Bian discusses several reasons and Solutions for the black screen of Konka TV.
Konka TV black screen
The black screen of the TV is a malfunction phenomenon of the TV, and is also the most common one, which shows no image. The black screen of the TV generally has two main situations: one is that there is no image, there is a sound, and the TV screen is not bright; the other is no image, no sound, and the TV screen is bright. These two conditions are the most common black screen phenomenon.
The black screen of the TV may also refer to some other phenomena, such as no image on the HDMI input; no image on the USB input; no image on the AV/S/HDTV input; and no image on the VGA input. It also includes only one horizontal bright line on the screen; there is only red/green/blue color on the screen; there is only one vertical bright line on the screen; MITV has no image; there is a bright line on the screen; there is no image on the screen, etc. .
Konka TV black screen how the matter
Judging from the above phenomenon of black screens on televisions, we know that the causes of black screens are various. It is still more complicated to completely understand how the black screens are still going. Here we discuss some simple and common situations.
1. The first reason may be that the power supply circuit is not normal. It shows no response when the panel is pressed, and the indicator light is off. One possibility is that there is a problem with the input stage of the power circuit; the other possibility is that the load of 5V has become heavier.
2. If the circuit source is normal, there may be a problem with the circuit that drives the backlight.
3. There is no problem in both aspects of the appeal, so it may be that the circuit of the control board of the high voltage board in the AD board is faulty.
4, there is the backlight of the screen is broken or other special circumstances.
Konka TV boot black screen how to do
1, the power circuit is not normal, first check the 12V voltage is normal, followed by check 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, the power circuit input stage has a problem. This kind of failure is very common. It is usually a burn-out or a malfunction of the voltage regulator chip. Replace the relevant parts.
2. There is a problem in the circuit that drives the backlight. Connect the monitor to the host to check it. Observe the screen carefully. The common fault of the high voltage board is that the high voltage board itself is burned out and no 12V supply and switch chip failure are caused. Replace the relevant parts. .
Maintenance involved amount
32 inch and below LCD TV outsourced maintenance, overhaul (all circuit board parts repair, does not include the signal line / fuse / switch button / indicator / connector and all circuit board components deleted or increased) price of 200 yuan Ranging from 32 inches or more, major repairs range from 300 yuan (without material fees and site fees). This price varies by ±20% due to different regions. If you need to replace the display screen, circuit board or backlight board and other materials, the price will need to increase the related materials fee and site fee.
Warranty
On March 1, 2011, the country has included flat-panel TVs in the warranty range of the Three Guarantees, implemented flat-panel TV repairs for one year, the main components of the display, backlight components (plasma TVs are driven components), logic components, High-frequency tuner repair for 3 years. For no image failure caused by power boards, circuit boards, etc., during the three-year repair period, after the warranty is over, the “gate fee + maintenance fee + material fee†will be charged; for example, for display screens, backlight components, logic components, and high If there is no image failure caused by the frequency tuner, it will enjoy a three-year repair period, and after the repair period, it will also implement fee maintenance.
Konka TV black screen
The black screen of the TV is a malfunction phenomenon of the TV, and is also the most common one, which shows no image. The black screen of the TV generally has two main situations: one is that there is no image, there is a sound, and the TV screen is not bright; the other is no image, no sound, and the TV screen is bright. These two conditions are the most common black screen phenomenon.
The black screen of the TV may also refer to some other phenomena, such as no image on the HDMI input; no image on the USB input; no image on the AV/S/HDTV input; and no image on the VGA input. It also includes only one horizontal bright line on the screen; there is only red/green/blue color on the screen; there is only one vertical bright line on the screen; MITV has no image; there is a bright line on the screen; there is no image on the screen, etc. .
Konka TV black screen how the matter
Judging from the above phenomenon of black screens on televisions, we know that the causes of black screens are various. It is still more complicated to completely understand how the black screens are still going. Here we discuss some simple and common situations.
1. The first reason may be that the power supply circuit is not normal. It shows no response when the panel is pressed, and the indicator light is off. One possibility is that there is a problem with the input stage of the power circuit; the other possibility is that the load of 5V has become heavier.
2. If the circuit source is normal, there may be a problem with the circuit that drives the backlight.
3. There is no problem in both aspects of the appeal, so it may be that the circuit of the control board of the high voltage board in the AD board is faulty.
4, there is the backlight of the screen is broken or other special circumstances.
Konka TV boot black screen how to do
1, the power circuit is not normal, first check the 12V voltage is normal, followed by check 5V voltage, if there is no 5V voltage or 5V voltage becomes very low, the power circuit input stage has a problem. This kind of failure is very common. It is usually a burn-out or a malfunction of the voltage regulator chip. Replace the relevant parts.
2. There is a problem in the circuit that drives the backlight. Connect the monitor to the host to check it. Observe the screen carefully. The common fault of the high voltage board is that the high voltage board itself is burned out and no 12V supply and switch chip failure are caused. Replace the relevant parts. .
Maintenance involved amount
32 inch and below LCD TV outsourced maintenance, overhaul (all circuit board parts repair, does not include the signal line / fuse / switch button / indicator / connector and all circuit board components deleted or increased) price of 200 yuan Ranging from 32 inches or more, major repairs range from 300 yuan (without material fees and site fees). This price varies by ±20% due to different regions. If you need to replace the display screen, circuit board or backlight board and other materials, the price will need to increase the related materials fee and site fee.
Warranty
On March 1, 2011, the country has included flat-panel TVs in the warranty range of the Three Guarantees, implemented flat-panel TV repairs for one year, the main components of the display, backlight components (plasma TVs are driven components), logic components, High-frequency tuner repair for 3 years. For no image failure caused by power boards, circuit boards, etc., during the three-year repair period, after the warranty is over, the “gate fee + maintenance fee + material fee†will be charged; for example, for display screens, backlight components, logic components, and high If there is no image failure caused by the frequency tuner, it will enjoy a three-year repair period, and after the repair period, it will also implement fee maintenance.
These products are used in intelligent high-frequency switching power supply, electric power supply, railway power supply, large LED power supply, and uninterruptible power supply(UPS)
power connector
Huizhou Fibercan Industrial Co.Ltd , https://www.fibercaniot.com