Why is the LCD TV normal when the monitor is just turned on, and the screen will go black when it is

1 Method steps are as follows:

Right-click on the desktop, select Properties, select the Settings tab, and you'll see two blue boxes labeled , showing that one row of options has been selected: Multiple Monitors. Turn on the check number, and if there is a monitor selected, it will be back to normal.

If you don't have this, and you want to restore the single-screen display, you can.

Uninstall the graphics card driver first, and the method can be searched on the Internet.

Turn on the computer again and press F8, select to enter VGA mode, there will be a prompt to debug the resolution, select automatic debugging. to restore the appropriate resolution.

Finally, install the graphics driver. It can be reverted to a single-screen display. Then adjust the resolution and refresh rate.

2. In this case, in fact, it is not necessary to restore it, and it can be used directly. Here's how to use it:

Right-click on the desktop, select Properties, select the Settings tab, and you'll see two blue boxes labeled , which represent the two output screens. Click on the 1 screen to see the resolution displayed below, select the resolution of the small dot, and you can see that "Use this device as the primary monitor" and "Extend the Windows desktop to this monitor" have been selected below.

Point 2 can see the resolution setting of screen 2 and turn it down. Then check the option "Extend the Windows desktop to this monitor".

Look at the position relationship between the two blue boxes, and drag their positions to adjust: for example, they are placed horizontally side by side (1 on the left, 2 on the right).

Point OK. At this time, the TV has a display, but only the desktop background painting, no icon. At this time, you can debug the detection: you can open a folder arbitrarily, set the size to "restore", and then drag the page to the right side of the screen (that is, when the previous step is in the middle position, 2 is on the right).

At this time, be sure to keep the external screen (TV) connected,When the page is dragged out of the right edge of the computer screen,The part dragged out can be seen on the external screen。 It is equivalent to having a virtual screen on the right side of the computer screen.

Next,Screening,Take **ppt file as an example,Open ppt,Normal screening,You can see that the TV is displayed in full-screen mode,And the computer is in style。 That's the beauty of dual screens.

Enter the system security mode,Adjust the display resolution and then restart,It is recommended to adjust to1024*768,General monitors support,If the original display refresh rate is1024*768, then make a small change,The older display does not support the resolution very high。

LCD TV, unlike a computer monitor, does not support much screen resolution as well as refresh rate.

The resolution of the computer when it is turned on is 640*480, and after entering the system, it is not necessarily.

Your problem,It's because your LCD TV supports640*480,But it doesn't support the resolution and refresh rate built into your current system。

The solution is,Find an ordinary LCD monitor,After entering the system,Adjust to the resolution supported by your LCD TV,And then change back to the TV。

The display resolution is incorrect.

You either take the host to someone else, turn it to the lowest resolution, and come back again.

Or change a monitor and come back and tune it up and put your monitor back on.

The refresh rate of your computer has been reset.

1. If the boot screen of the unit lights up, the screen will be black.

At this time, there is no accompanying sound.

First of all, measure whether the voltage of each group at the output end of the main switching power supply circuit is normal.

If the above measurement is normal, it means that the switching power supply circuit is not faulty, otherwise it is a problem with the switching power supply circuit.

Even if the above measurements are normal, but the power-on test machine is still not good, at this time, in the measurement, all DC-DC voltage conversion circuit chips on the motherboard, whether the voltage of each output pin to the ground is normal, if there is any abnormality, check the components around the abnormal feet of the chip.

2. If the screen of the unit lights up, the screen will go black, but there is a sound at this time.

First of all, measure whether the voltage of each group at the output end of the main switching power supply circuit is normal.

If the above measurement is normal, it means that the switching power supply circuit is working normally, otherwise it is a switching power supply circuit problem.

Even if the above measurements are normal, if the power-on test machine failure is still like this, in the measurement, the backlight drive control circuit chip, whether the voltage of each pin to the ground is normal, if there is any abnormality, check the components around the abnormal pins of the chip.

What's going on with the black screen of the TV when it turns on.

1、If the TV is turned on normally、The panel buttons are normal、The indicator light is also flashing,But the black screen suddenly appears,It may be that there is a problem with the circuit of the TV backlight board,Connect the display stool to the host jujube cherry for detection。

2、If you can see a faint image on the screen,It means that the driver board display of the TV is normal,The black screen may be caused by the high-voltage board insurance being burned,Therefore,To change a new insurance,If the switch chip fails,You should ask a professional to repair it,Do not disassemble and assemble it yourself,So as not to cause great damage。

The reasons and solutions for the LCD TV to go black for a while are as follows:

1.Power failure.

Workaround: Check the power connection, most of the time, the best answer is the simplest answer. So, check if everything is working properly or if there are no loose connections.

Then do the following: Turn off the TV, and then unplug it. After 15-30 minutes, plug the TV back in and press and hold the power button for a few seconds.

Next, release the buttons and turn on the TV again.

2.Faulty cables.

Workaround: Consider replacing it with a new HDMI cable as it may have a short circuit or other defect that causes a black screen.

3.The mode is set incorrectly.

Workaround: Some TVs will automatically turn off the screen, if your TV has this feature, be sure to turn off the power saving mode or energy saving mode.

4.There is a problem with the TV panel.

Workaround: If you've tried the first three steps and your TV screen is still black, consider replacing its power strip. Doing this work is quite complicated. In fact, the model of the motherboard and the method you are going to use vary from TV to TV.

To do this, you need to: prepare a soft towel or cloth to protect the TV screen, remove the screws; Place the TV facing down and use a screwdriver to remove the screws on the back; Locate the fuse on your TV and replace it if it blows; Remove the screws that hold the power strip in place. Then replace the old one, put on your new power strip, and tighten it carefully; Finally reconnect all cables and wires, attach the back cover of the TV and secure it, turn on the TV to check if the repair has resolved the problem.

First, the backlight plate problem. The power supply of the TV is normal,The panel buttons are also normal,The indicator light of the TV is also flashing,But when the TV is suddenly black, this means that the backlight plate of the TV may not be lit。

You can connect the monitor to the host for boot check,At this time,The reason for the sudden black screen of the TV may be the failure of the high-voltage board,The failure of the high-voltage board is generally due to the fact that the safety is burned or there is a problem with the switch chip。

Solution: The freshness of the high-voltage plate is burned off, and you need to buy a new insurance to replace it, if there is a problem with the chip of the switch, you must ask the commissioner to be responsible for repairing the chip of the switch.

Second, the power supply problem. The TV screen suddenly went black, and we also had to consider whether there was a problem with the power supply circuit of the TV,The phenomenon at this time is that the buttons of the panel do not have any response,The indicator light of the TV is not on。

When checking the power supply, first check whether the voltage of the power supply is too low, then you can use the meter to detect, and at the same time check the input stage of the power supply circuit to observe whether the voltage of 12V is converted to a voltage of 5V, which is the most common problem that causes the power supply to suddenly go black.

Solution: The reason why the TV screen suddenly goes black is that there is a voltage problem, so you need to prepare a voltage regulator at home.

Ensure the stability of the TV power supply voltage. If there is a problem with the input stage of the power supply circuit,The input stage of the power supply circuit should be adjusted,Ensure that the voltage input to the TV is normal。

This answer is suitable for Hisense75E3D、Huawei Smart Screen。

S Pro 65 brand TV model.

1. It may be that the device on the circuit board is seriously heated, the solder feet are desoldered, and the black screen on the boot caused by the circuit is on and off. 2. It may be caused by the oxidation of the device with pad cracks due to humid air. 3. It may be that the performance of some devices has deteriorated and the working state is unstable.

Suggested solutions:1、If you usually need to move the LCD TV,Then you must pay attention to handle it as gently as possible,The components of the LCD TV are relatively fragile,If it is subjected to a large impact or collision,It will be easy to fail。 2. After using the LCD TV for a period of time, we must pay attention to the cleaning of the LCD screen, timely cleaning makes the LCD screen a good protection, it is recommended that the license should be cleaned once a week, and gently wipe it with a cotton cloth as clean as possible.

3. The back cover of LCD TV series is easy to enter the dust, so you can use a good cover, and after watching TV every time, you can use the cover to cover the TV to effectively prevent dust. 4. Usually in the use of TV, it is best to use it for three and a half hours, at least twenty minutes of rest time, which can effectively alleviate the load of LCD TV, if it is used for a long time, the LCD screen will be damaged, and this is irreversible damage, and it cannot be repaired. 5. Although the power consumption of the LCD screen is indeed small, the voltage of the transformer behind it is very high, so do not easily open the back cover of the screen in the case of live electricity.

It may be that there is a fault in the power supply, which prevents the power supply from starting; It may be that there is a virtual soldering phenomenon in the internal screen drive circuit, resulting in a black screen; It may be that the circuit on the high-voltage board switch is burned out; It could be that there is a problem with the backlight of the display; Staring at silver may be due to the inconsistency between the signal of the TV and the set-top box, resulting in a sudden black screen. Reason analysis:The backlight plate problem is in **TV,If its power cord is connected normally,The indicator light of the TV is also flashing normally,It is a sudden black screen,It indicates that there is a problem with its backlight board。

In this case, we have to open the case, inspect its backlight plate, and carry out repairs. If the backlight panel is damaged, it needs to be replaced with a new one in time. Power supply problems, power problems, and black screen are also a cause.

But before repairing,We have to determine whether its panel buttons can be used normally,Whether the indicator light of the TV is still on,At the same time, we also have to check whether its power supply voltage is too low,We can use an electric pen to detect。 In this case, we can plug in a voltage regulator that will bring its power supply** back to normal and its input voltage back to normal. If the component is faulty, when the screen is black, the TV still makes some noise, it can mean that its triode is empty welded.

In this case, we need to disassemble the shell and re-solder the relevant electronic components, so as to solve the problem of the black screen of the TV.