The reason why the LCD does not display during the power on phase

I can tell you responsibly (I'll be anonymous - -

Definitely not a problem with the display!

Because my computer is like this, just reinstall the system.

The graphics card driver does not match, it is best to use the original driver with the graphics card.

After redoing the system, observe that there is still this problem, try to change the host.

What to do: First, make sure that the external and internal connections are connected smoothly. The external connection has a monitor, a host power supply, etc.

There is a cable between the host power supply and the host power connector inside (sometimes the contact here is not good). The more common reasons are: graphics card, memory due to long use, long-term contact with dust in the air, resulting in the oxide layer on the gold finger, resulting in poor contact.

In this regard, rub the gold finger back and forth with a moderate amount of alcohol glued to cotton, and insert it back after drying. In addition, observe whether the CPU is working normally, turn on for about half a minute, and touch the heat sink of the CPU fan with your hand to see if there is a temperature. If there is a temperature, the possibility of CPU failure can be basically ruled out.

If there is no temperature, tidy up the socket of the CPU to make sure the contact is in place. After that, before the temperature, your CPU can be upgraded: (In addition to the above method, there is also a special move:

Clear the BIOS settings by unplugging the jumper or replace the CMOS battery of the motherboard. When all of these methods have been tried and failed, you can summon Big Prawn to come out of the mountain to help.

Generally speaking, it is impossible for the monitor to have such a serious problem, so you have to consider whether it is a hardware problem and try to plug the graphics card back in.

Also consider using an alternative method to use the host on a different monitor to see if there are any similar problems.

The liquid crystal display (LCD) screen is black after 1 or 2 seconds after being turned on for 2 seconds, and the fault phenomenon is still after turning it back on, but if its indicator light is on (not flashing), it indicates that the display has one of the following faults:

1. The high-voltage board, including its power supply circuit failure;

2. The circuit failure of the backlight tube is generally due to the damage of a certain backlight tube, or the oxidation or rust of the pin, or the breakage of the pin;

3. AD driver board failure;

If you can see the screen "display" content after the black screen under strong light (or when squinting), the fault belongs to Article 3, otherwise it belongs to Article 3, please check by yourself according to the premise (black screen, but the indicator light is on).

First figure out what type of power strip is yours? Stand-alone power strip or power strip with integrated high-voltage board? How to detect the high-voltage circuit without integration; Also, what do you mean by changing the lamp?

Have you found the lamp burned? If the lamp is broken and replaced, you can see the light when the LCD screen is lit separately, and you should find out what the problem is, not replace it directly.

1. Black screen failure and fault phenomenon:

After booting, the host does not have any error indication on the display, and the status indicator of the display is normal, and the power switch is also normal, but there is no image (black screen), but sometimes it can be displayed normally when the color display case is slapped or occasionally turned on, but the situation is getting more and more serious after using it for a period of time.

Second, the misunderstanding of the fault point:

This fault may seem to be the result of a poor contact somewhere in the circuit, but many people often don't know what is causing it.

3. Causes and countermeasures of failures:

1. You can first look at whether there are virtual soldered components or solder joints in the filament power supply circuit, which is usually the culprit of such failures.

2. Sometimes the host will also cause a black screen due to the host, but no matter how you slap the color display case, it will not get better, so if you have the conditions, you can connect the monitor to another host to determine that there is no fault to try it. In addition, there are many displays at present, after unplugging the signal cable connected to the graphics card, the self-test display function will appear, if the display is normal, it means that the display is basically fault-free, and the fault point is on the signal line or graphics card, so that it is more convenient to find the fault point.

Note: In view of the fact that the failure causes of other black screen phenomena are relatively professional, they will not be introduced.

Desktop computer boot monitor no display troubleshooting.

Now the display will have an indicator of the working status of the display, this light is generally the power light of the display Some monitors are in the standby of the main lead sail machine, the screen will prompt the signal line is not connected, like this kind of display will always work if the power is not turned off and some monitors will automatically enter the standby state (energy-saving mode) when the computer enters standby, at this time you will find that the display screen is black, and the power light shows orange, yellow or the power indicator is constantly flashing This means that the display is in standby (energy saving mode).

According to your description, I judge that the display of your Huaihail has entered the standby state (energy-saving mode), and it can be turned off or not at this time, but there is not much power to turn on the cherry blossoms, and I still recommend not turning it off if it is a short time Because turning on and off the LCD display frequently in a short period of time will cause the lamp to age quickly, or even blow it off

You can unplug the signal cable. If the monitor doesn't show that the cable isn't connected. Or the color is not right.

If it's dark, that's the problem with the display. If it's dark, it's probably the backlight tube problem. If you unplug everything is fine.

Just look at the host graphics card or something.。。

Hello, I'm a professional, it's the front key switch is broken, just change it.

If the computer boot monitor is not bright, you can check the reason according to the following:

1. Check that the display is not powered on or turned on.

Generally, there will be a power-on indicator on the display, you can look on the display to see if the display has been turned on, generally if it is turned on, it will light up directly.

If you have pressed the switch and it still doesn't light up, then please check whether the power cord socket is powered on, try it with another socket, or try it with another power cord (generally speaking, the power cord on the LCD display and the power cord on the rice burger and the main chassis can be used universally).

Generally speaking, if you move the main unit frequently, when the light does not turn on, it is likely that the power cord is in poor contact or the wire inside is broken.

2. Check whether the VGA database of the monitor is plugged in.

When the power supply is okay. At this time, the display also has some information out of the bridge, such as the display showing a prompt such as "no signal". At this time, it is necessary to check whether the line shown in the figure below is plugged in.

In addition, remember not to plug in the data cable of the display cable incorrectly, if you have a discrete graphics card, you should insert a discrete graphics card. If you don't have one, plug in the integrated graphics card.

There are also some netizens who may be independent graphics cards, but the display prompts "no signal", then it is possible that there is something wrong with the independent graphics card, first unplug the independent graphics card, clean up the gold finger part of the independent graphics card, and at the same time clean up the graphics card slot and then plug it back in.

The computer black screen is generally the case.

1: The memory is loose. Solution: Plug in the memory module from scratch, and it is best to clean up the gold finger of the memory.

2: The graphics card is loose. The solution is the same as above.

3: Power supply problem. Solution: Send it to the repair station to repair or replace it with a new 4: The CPU fan is broken. Solution: Add some oil or get a new 5: The memory is broken.

After your computer is powered on, the hard disk light and the power supply light are always on, the monitor has no signal, and the computer has no problem with the power supply or graphics card except for the fan sounding at all.

You can swap out your power supply and graphics card with your friends using the tape swap method to find out the problem.