LCD TV black screen repair method, how to repair LCD TV black screen

LCD TV black screen fault repair.

It is recommended to judge whether the backlight plate of the TV is abnormal or damaged, and then confirm whether the picture tube of the TV is broken, and if it is damaged, replace it directly; It may also be the phenomenon of virtual soldering of the TV circuit, find out the position of the virtual soldering of the circuit, and re-soldering the place of the virtual soldering after finding the position of the virtual soldering of the TV, and reconnect it.

The repair method after the LCD TV screen is black, you can replace the display screen inside.

Normal,If you find that the LCD TV has a black screen,Generally, the fuse is broken,You can directly change the fuse。

The repair method of the black screen fault that I often encounter during the repair process.

1 panel (LCD screen);

2 A D driver board;

3. LCD drive line;

4. High-pressure plate (also known as booster plate, high-pressure bar, inverter);

5. High-voltage plate wire;

6. Power adapter (external, generally DC 3A 12V), and the switching power supply of some monitors is built-in to the machine, directly input AC220V voltage;

7. High-frequency signal processing board;

8 Shells.

The maintenance method of the black screen of the LCD TV is as follows.

First of all, check if the power supply voltage of the TV is normal?

Check if the transformer inside the LCD TV is normal?

In this case, it is likely that the resistors in the circuit board are damaged and the entire circuit is broken, so it is necessary to repair it.

The black screen repair method of LCD TV is as follows:

Tools: Device (Xiaomi P48), System (MIUI TV App (APK format.

1. Check whether the power supply of the TV is turned on, whether the power switch is turned on, turn on the power of the TV, and turn on the switch to solve the problem;

2. Check whether you have pressed the power button of the remote control to turn off the screen of the TV and make the TV in standby mode, you can press the power button again to solve the problem;

3. Check whether the TV detects that there is no signal input and starts the black screen protection, you can first check whether the signal input connection of the TV is unblocked, and then switch between modes by pressing the signal source key of the remote control, such as TV mode, ** mode, HDMI mode, etc.;

4. If there is still a black screen after the above methods are checked, it is generally judged to be a black screen caused by hardware failures such as the motherboard switch circuit or other component failures of the TV, screen failures, etc., and it is recommended to contact the after-sales service of the TV for comprehensive testing and warranty of the TV.

Precautions for the black screen of LCD TV:

1. Verify whether the internal crystal of the LCD TV is faulty, and if so, contact the maintenance personnel.

2. You can verify whether it is the reason for the lack of signal, and turn on the signal source if there is no signal.

3. Verify whether the power of the LCD TV is turned on, and if not, turn it on immediately and try whether the black screen continues.

Summary. Pro, the maintenance method of the black screen of the LCD TV has the following steps:1. First open the screen shell of the LCD TV, then open the iron cover sealed by aluminum foil, unplug the lamp line, and then find the coil to check the surrounding capacitance.

2. Find the transformer circuit in the circuit board, and observe whether there is any abnormality (burned, bulging or damaged, etc.) between the copper wire components and its surroundings. 3. If there are damaged components, they need to be replaced.

Pro, there are the following steps for the maintenance method of LCD TV black pickpocketing screen: 1. First open the screen shell of the LCD TV, and then open the iron cover sealed by the aluminum cracked foil, unplug the lamp line, and then find the coil to check the surrounding capacitance. 2. Find the transformer circuit in the circuit board and observe whether there is any abnormality (burned, bulging or damaged, etc.) between the copper wire element and its surroundings.

3. If there are damaged components, they need to be replaced.

How to maintain LCD TV: 1. Avoid moisture on the TV. If the environment in which the TV is stored is too humid, the damage speed will be accelerated for the TV, and the humidity will corrode the LCD electrodes, which will cause damage to the TV.

2. Avoid touching the LCD TV screen with your hands. If the finger touches the LCD TV screen, it is likely to cause damage to the screen, and the static electricity on the hand may cause the crystal of the LCD TV screen to burst and fail, forming bright spots. 3. Avoid cleaning the screen with a damp rag.

The LCD TV screen is relatively fragile, so you need to wipe it gently with a dry soft cotton cloth when cleaning.

Summary. Hello.

Hello. If there is still sound behind the TV screen, you can try to shake the TV gently, if there is a pattern on the TV screen with a song screen, it means that it is caused by the virtual welding of the circuit in the electric jujube video.

If there is no sound after the TV screen is black,Then you can check from the power supply,Check the line,Then check the TV,You can try to change the channel、Gently tap and sing and other common methods,If it has not returned to normal,Then Zheng Zheng recommends that you loose socks can be repaired,Try not to disassemble the back cover of the TV yourself。

You refer to it.

First, check whether the power supply of the TV is turned on, whether the power switch is turned on, turn on the power of the TV, and turn on the switch to solve the problem; Check whether you have pressed the power button of the remote control to turn off the screen of the TV and make the TV in standby mode, you can press the power button again to solve the problem.

Check whether the TV detects that there is no current signal-type closed number input and starts the black screen protection,You can check whether the signal input connection of the TV is unblocked,Then press the signal source key of the remote control,Switch mode by mode,Such as TV mode、** mode、HDMI mode, etc。

After the above methods are checked, there is still a black screen in the old rent, then it is judged that the motherboard switch circuit or other component failures of the TV, screen failures and other hardware failures caused by the black screen, contact the after-sales service of the TV to conduct a comprehensive inspection and warranty of the TV.

1.Check that the power cord and plug are properly connected to make sure the TV has enough power**.

2.Check that the TV's backlight is working properly. If the backlight is faulty, the TV screen will dim or go completely black. You can judge whether the backlit hall light is working properly by observing whether there is a bright light on the back of the TV.

3.Check whether the signal input of the TV is normal. If the signal input is faulty, the TV screen will show no signal or a black screen. You can try changing the signal source or checking that the signal cable is connected properly.

4.Check that the motherboard of the TV is working properly. If the motherboard fails, the TV screen may appear blurry, flickering, or completely black. You can try restarting your TV or replacing your motherboard.

5.Check if the screen of your TV is damaged. If the screen is damaged, the TV screen will have problems such as black or colored stripes, cracks, etc. At this point, the TV screen needs to be replaced.

The above are common repair methods for LCD TV black screen,If the above methods cannot solve the problem,It is recommended to contact Xunsu professional TV maintenance personnel for maintenance。

<> LCD TV black screen maintenance method,If it is caused by abnormal power supply circuit,It may be that there is a problem with the input stage of the power supply circuit,Or it may be that the 5V load is aggravated。 In addition to the power supply circuit problem, it may also be the driving backlight circuit that has been destroyed by the fault, the AD board control high-voltage board switch part of the circuit failure, the backlight of the screen is damaged or other special circumstances.

How to deal with the black screen of the TV.

First quiet brother,If there is still sound after the TV screen is black,You can try to shake the TV gently,If there is a pattern on the TV screen,It means that the circuit in the TV is caused by virtual welding。

Second,If there is no sound after the TV screen goes black,Then you can check from the power supply,Check the line,Then rush to the TV to check,You can try to change the channel、Common methods such as gentle hitting,If it has not returned to normal,Then it is recommended that you can report for repair,Try not to disassemble the back cover of the TV yourself。

This answer applies to most brands of TVs such as LETV, Changhong, and Sony.

Computers and televisions are a great way to make our lives easier, and they are mainly composed of liquid crystal monitors and other parts. However, sometimes when we use a computer or TV, we will often encounter the phenomenon of black screen of the LCD monitor, so do you know what causes this phenomenon, if this phenomenon occurs, how should we repair it! So this article will introduce the relevant content for you specifically.

1. Tools Raw Materials:

1) LCD monitor, Phillips screwdriver.

2) Dispensable: electric soldering iron, multimeter, electrolytic capacitor.

Second, the method steps.

1. Open the monitor housing.

2. You can remove the base first, and then open it, the display shell is generally stuck on, and there is a screw on it. After removing the screws with a screwdriver, find a flat metal and slowly warp it.

3. Remove the aluminum foil sealed iron cover and unplug the backlight (lamp or LED) line.

4. The iron cover has the effect of protecting the internal signal from external interference, the general display will have, the surrounding is glued and sealed with aluminum foil, and there are several wires on one side of the iron cover to connect the inside, and the other side is connected to the LED or lamp. At this point, it should be unplugged, but pay attention to the plug order and don't make a mistake.

5. Find the coil and look at the large capacitors around.

6. After removing the iron cover, the circuit board inside is exposed, and we find the transformer circuit, that is, there is nothing unusual about the original and its surroundings (most of which are a separate board) wrapped with a lot of copper wires, such as: burned, bulging, and damaged.

7. Identify defective components and find replacement components.

8. Find the bulging capacitor and check the text on the outside of it, which is generally marked with xxv xx f (uf). XXV is the withstand voltage value, and the replacement can be greater than or equal to it. XXF (UF) is the capacitance value, and the replacement product should be equal to or close to as much as possible, and replaced with a soldering iron.

If you don't have a capacitor, you can choose to unplug it and leave it uninstalled, but this may shorten the life of the monitor.

9. Next, you can conduct a power-on test.

10. After unplugging or replacing the defective components, assemble the board and plug in the connecting wires. Turn on the power supply, if the phenomenon is not eliminated, please check again if there are any defective components, and they have not been found.

11. Finally, I wish your monitor to light up again.

I hope that through the brief introduction, everyone has a further understanding of these maintenance methods. I also hope that when this kind of problem occurs, don't panic, check and operate one by one according to the methods introduced above, and you will definitely be able to find out where the fault is. Of course, if you still haven't solved the problem, or you don't dare to do it yourself.

At this time, we must ask professional maintenance personnel to carry out maintenance, so that our products will not have other problems.

The black screen of the LCD TV needs to check the backlight and the corresponding circuit one by one, and then check the screen itself and others.

1. First of all, it may be caused by the abnormal power circuit, which is manifested as the button does not respond when pressing the panel, and the indicator light does not light up. One possibility is that there is a problem with the input stage of the power supply circuit, and the other possibility is that the load of 5V is heavier. 2. If the circuit source is normal, then there may be a problem with the circuit driving the backlight.

3. There is no problem with the above two aspects, then it may be that the circuit of the switch part of the control high-voltage board on the AD board is faulty.

There are many reasons for the black screen of the TV, first of all, check the power supply, as well as the backlight power supply driver board, as well as the backlight, as well as the signal source, etc. It is recommended to find a master to repair it.