Why does the screen dim when the laptop changes to an external power supply

Because in the brightness setting of the notebook, the power environment and the battery environment are managed separately. It may be that the brightness has been adjusted in previous use.

Solution: First, remove the power supply and enter the power management. On the brightness control bar at the bottom, drag the slider to adjust the brightness to make it darker.

Second, connect the power supply, and then on the screen brightness control bar in the picture above, drag the slider to adjust the brightness, which can be adjusted to the brightest.

When you do this, the screen will be brighter in the future when you switch from battery mode to power mode.

If you look at the power plan, there's a battery-like icon in those icons on the right side of the taskbar.

Inside there are settings to automatically turn off screen time, standby time, as well as brightness.

You may be connected to an external power supply when the brightness is set to be usually dark.

You can also find it from the control panel, the path is Control Panel Hardware & Sound Power Options, find the power plan you are using now, and then click on the change plan settings below to change the brightness when the power is connected to it.

PS: I use the English version of Vista, and there are probably some translations that are inaccurate, but the meaning is almost the same.

Hello, I am an engineer of HP Gold Service Zhengzhou Branch, and the HP power management mode is:

When the battery is in use, the system will automatically adjust to power saving mode to extend battery life, at which point your computer hardware changes to low-power mode, so the screen is dimmed to reduce energy consumption.

You can find this in the control panel.

Power Options. Set the power mode when using the battery.

Performance.

Please indicate what operating system you are using, and it is best to name the brand of the notebook, as the power settings will be a little different in different notebooks.

In the case of Lenovo laptops, there is a power management software. There are energy-saving options inside, and if you choose the highest performance, the brightness of the laptop's screen will increase.

There are also general notebooks that have hard settings. Different notebooks are also different.

Take the Lenovo Think series notebook as an example: FN+Home will increase the brightness of the laptop screen.

This is an automatic power saver and can be modified in the power plan.

Isn't it? Connect to external power supply·· The screen should be brighter

1.Excuse me: The screen of my computer has dimmed after the motherboard has been replaced.

1. The master who repaired the computer or you accidentally adjusted the brightness or saturation of the display in the process of changing the motherboard, of course, this is less likely, but it is also possible. You can also adjust the brightness or saturation of the screen now to see if it can be better.

Second, that is, did you have a discrete graphics card before, if so, as I said upstairs, can it be the master who repairs the computer to change it, and change it once.

3. If you used an integrated graphics card before, the quality of the motherboard you replaced is not as good as your original quality.

Fourth, set it again in the display properties, and try to change the resolution or refresh rate.

2.What's going on with the dimness of the notebook after changing the screen.

At present, the notebooks on the market are equipped with a brightness protection function (the screen brightness will be automatically adjusted), if you feel that the brightness is not enough, you can manually adjust it, the method is as follows:

1. Laptops generally have an additional key (fn button), its color is not black, it is easy to find, it can be used with keys of the same color, very fast. Then find the sun-like logo on the keyboard, and click this key to brighten the screen;

2. When the power supply is not plugged in, the computer will automatically become power-saving mode and dim, and the brightness can be adjusted back according to the method in step 1;

3. It may also be a problem with the graphics card settings, you can find the corresponding settings in the control panel (usually nvidia or ati), open it, adjust the desktop color settings in the display, and adjust the brightness until it is appropriate;

5. If the above four methods cannot solve the screen brightness problem, it is possible that the backlight screen of the screen is damaged, and it needs to be disassembled and detected at the maintenance station;

As above, you can try it step by step to see which method can be solved, if it really can't be solved, it is recommended to go to the official maintenance station of the corresponding brand for testing, and the machine testing is free of charge (if you need to replace the accessories, you will be charged the corresponding fee).

3.What to do if your computer's screen gets dark.

Check for link issues with your monitor.

Unplug all cables from the monitor, then open the case and remove the dust from the graphics card (see Graphics Card Installation for how to clean it). Then carefully polish the gold finger of the graphics card with an eraser, and finally link the graphics card and the monitor firmly. Test if it is due to poor exposure.

Reinstall the graphics driver. Sometimes, when the graphics card driver is not normal, it will also cause the display to be dimmed, and the latest driver of the graphics card will be reinstalled. For details about the graphics driver, see the entry for the graphics driver.

If the problem cannot be solved, consider using the substitution method. Connect the LCD monitor to the host of the normal monitor and observe whether the screen dims. Then connect the main unit to the LCD monitor that can be displayed normally and observe whether the LCD screen is darkened.

From this, it can be determined whether the fault is an LCD monitor or an internal fault of the main unit. If it is determined that the LCD is faulty, you can check whether the LCD is dimmed due to improper LCD settings.

The first is that there is a problem with the lamp, which can darken the display due to aging or short circuiting. If there is a problem with the lamp, you have to change to a professional repair company. Aging and short circuits of lamps are rare.

Aging is generally due to long-term use or collision during use (the service life of the lamp can reach about 3 5 years during normal use), and the short circuit is caused by the metal inside the screen case. If the screen housing is cracked, careful use can prevent a short circuit. The second is that the motherboard has no voltage for the high-voltage board, and there will be problems, aging or short circuits of the motherboard, most of which can be repaired without replacing the motherboard.

The third is that the high-voltage board is aging or burned out, or the power connection line of the high-voltage board is loose or burned. Screen darkening caused by high-voltage boards is quite common, because high-voltage boards work at high temperatures for a long time, and chips are more likely to age or burn out. The fourth is broken screen cables, which is also the reason why the screen often goes dark.

Because NB is folded, opening and closing the screen with too much force will wear the screen cable, and frequent use will easily cause the screen cable to break. Generally, problems with the graphics card will not cause the screen to dim, and most of them are color screens or no displays. Maintenance of the dark screen:

In addition to the problem of replacing the lamp, replacing the non-original high-voltage board may cause the dimmable brightness of the LCD screen to fail (the impact depends on the individual), and the high-voltage board can be repaired under normal circumstances. In general, it is not recommended to open it for repair by yourself.

1、There are "F5" and "F6" keys on the notebook keyboard, and each key has the same icon as "", these two keys are the plus or minus keys to adjust the brightness of the screen, and you can directly press one of the keys to adjust the brightness.

2. If there is no response when pressing the F5 and F6 keys, then we should cooperate with the FN key, that is, press and hold the FN key first, and then press one of the two keys, "FN+F5", "FN+F6".

3. Notebook screen brightness adjustment is actually very simple, the general notebook instruction manual will also be introduced in detail for you, the easiest way is to use the combination of the notebook keyboard to adjust the brightness of the notebook screen, which is also a common method of adjusting the brightness of the notebook, and some brands of computers also have free power management software, which also has a screen brightness adjustment function inside.

Note: Different laptops use different keys, some have "F4" or "F7".

There are also some brand notebooks that can also adjust the brightness of the laptop screen through other methods, such as Lenovo laptops also come with power management software, and the brightness of the laptop screen can be set through this power manager software.

There are many ways to adjust the brightness of the notebook screen, for example, we can also use a lot of energy-saving software to adjust the brightness of the notebook screen, for example, Master Lu also has optimized energy-saving settings, which can be automatically optimized internally to adjust the brightness of the notebook screen to a lower and softer state.

The reasons are as follows: 1. It may be that the computer motherboard has no voltage or the high-voltage board and the motherboard have problems, aging and short circuits and other faults, and most of these faults can be repaired without necessarily replacing the motherboard;

2. The broken screen line of the display screen will cause the display screen to become darker, because the notebooks are folded, so if we open and close the screen too hard, the screen line will be worn or even broken;

3. The high-voltage board of the computer is aging or burned out or the power connection line of the high-voltage board is loosened or burned, etc., and the screen darkness caused by the high-voltage board is more common. If the high-voltage board of the display screen works at high temperature for a long time, the chip will be more likely to age or burn out.