My monitor has a few more minutes of power light on after unplugging the power cord, why

After the power supply is unplugged, all circuits such as line output and field output stop working. However, some electrical energy is still stored in the capacitors of the output stage of the switching power supply, and the current drawn by the power indicator (LED diode) is small, and this electrical energy can still make it shine until the power is exhausted (or the voltage at both ends of the capacitor drops below a certain value). The capacitance capacity in different displays and the current flowing through the light-emitting tube are also different, so the length of time this phenomenon lasts varies from machine to machine.

Also, it seems that I heard (I haven't encountered) that some machines recently don't know why a rechargeable battery is added, generally the "capacitance" of this battery should be larger than the capacitance of ordinary capacitors, if the light-emitting tube is connected to the circuit of this battery, it should emit light for a longer time.

But I also don't understand, they said "some machines have a battery in it", if it's true, then what is the battery for? If it's for powering a memory block, why do you need to connect a light-emitting tube to it to drain the power? So I don't really believe that there will be a battery in it, but I don't believe that there is, and I don't believe that the light emitting tube will be connected to the battery circuit. ）

It could be a capacitive discharge, which should be fine.

Motherboard problems or BIOS problems, you go to the Internet to search, there should be an answer.

It's outrageous, it's out of power, what's still bright?

Summary. Hello! We're happy to answer for you!

The problem that the monitor light is still on when the power supply is unplugged is generally caused by the failure of the capacitor or other components inside the display to be charged and discharged in time. Usually, it only takes a few minutes or hours for the lights to turn off automatically. If the lights are not extinguished after a long time, here are a few things to consider:

1.Display switch not turned off: Confirm that the display switch was turned off before unplugging the power supply.

Before turning off the display, the LED will emit green or blue light, at which point the power stored by the capacitor will be naturally released and the LED light will naturally turn off. 2.Aging or damage to capacitors or other components:

If the display has been used for a long time, the internal capacitors or electronic components may have aged or damaged, and the lights may not turn off automatically. At this time, it is necessary to send the monitor to a professional repair point for inspection and repair. 3.

Poor power cord contact: Confirm that the power cord is plugged in tightly. If the plug is not plugged in tightly, the capacitors and other components inside the display may not be discharged in time, causing the light to remain on.

Do not disassemble the display and other electronic equipment without permission to avoid secondary damage or safety accidents.

The power light of the monitor is on but the screen is black.

Hello! We're happy to answer for you! The problem that the monitor light is still on when the power supply is unplugged is generally caused by the failure of the capacitor or other components inside the display to be charged and discharged in time.

Normally, in this case, it takes a few minutes or hours for the lights to go out automatically. If the lights are not extinguished after a long time, the following aspects need to be considered:1

Display switch not turned off: Confirm that the display switch was turned off before unplugging the power supply. Before turning off the display, the LED will emit green or blue light, and the power stored in the capacitor will be naturally released, and the LED light will naturally go out.

2.Deterioration or damage to capacitors or other components: If the display has been in use for a long time, the internal capacitors or electronic components may have aged or damaged, preventing the lights from turning off automatically.

At this time, it is necessary to send the monitor to a professional repair point for inspection and repair. 3.Poor power cord contact:

Verify that the power cord is plugged in tightly. If the plug is not plugged in tightly, the capacitors and other components inside the display may not be discharged in time, causing the light to remain on. Do not disassemble electronic equipment such as displays without permission to avoid secondary damage or safety accidents.

Troubleshoot whether it's a PC or monitor issue.

First, whether your PC is running normally, whether it is in a normal state of booting, whether it has entered the operating system, if there is a condition, you can change a monitor, and see. Also check if your PC has a screensaver? Or auto-hibernation!

Second, the back end of the monitor is not connected to the PC and plugged in directly to see if the monitor will be on, and whether the power light of the monitor is red or other colors, if it is red, it means that the power has been turned on and is normal. If the screen doesn't light up, the light won't light up when the screen is black. If you try to change the power cord, then there must be something wrong with the monitor end, and the power cord inside can be in poor contact.

If it's a PC system problem, you need to find a computer repairer to deal with it, or you can dial the graphics card on the PC and reinsert it yourself!

Is there a mismatch in the resolution or refresh rate settings? Enter safe mode, delete the graphics card driver, and try to restart, if it still doesn't work, it may be a problem with the display.

Check whether the data cable plug connecting the monitor to the host computer is in poor contact?