What is the reason why the power supply of the computer board and the AC power supply keep switching

It definitely needs to be replaced.

The power supply of the notebook is called the power adapter, it is not only a power cord, the main thing is the adapter, it is like a transformer, without it, it will be very damaging to the notebook.

The original power supply is usually about 200 500 yuan, and the non-original power supply will be much cheaper, so many users will consider choosing a non-original power supply when buying a second power supply. Theoretically, the original power supply is relatively better, but in practice the difference may not be felt. Usually there is a safe range of input voltage allowed by the load, such as adding or subtracting 5% from the nominal value, for example, the input requirement of many inch hard disks is 5V plus or minus 5%.

The same is true for notebooks, if the input voltage is too large or too small, it will cause the protection circuit to operate and stop working.

However, before the action of the protection circuit, the voltage regulator circuit inside the book has been biased to the upper or lower limit of work, which has a certain impact on the life of the device in principle, but according to the current point of view, the reliability of electronic components has been quite good, as long as it is within the design range, there will be few problems, and the life will not be shorter than the life of this book, so this is not the main problem.

The more important problem may be the data security of the book, and the sudden automatic protection and stop working is a terrible thing for the computer, especially many friends who don't use batteries. Sometimes the inexplicable restart of the computer is also related to this. For the original power supply, the manufacturer knows what kind of load to be connected, so it is easy to calculate the nominal voltage and nominal current of the power supply.

The nominal voltage of the power supply should meet the following two conditions: first, when the maximum current output, the nominal voltage minus the voltage drop of the power supply itself should be greater than 95% of the voltage required by the load. Second, when the minimum current is output, the design voltage minus the voltage drop of the power supply itself should be less than 105% of the voltage required by the load.

You can ask the computer experts about it.

Check the plugs of the AC power adapter to see if the contact is not good, if you rule out that the contact is not good, then it must be that the AC power adapter is broken.

There may be a problem with the plug of your transformer, such as being knocked out of shape, so that the contact is poor. Or if there is a problem with the transformer, this is more troublesome, and it may burn the computer. In short, if something goes wrong, it's dangerous, so it's best to check it, and if it doesn't work, change it.

First of all, it is not good to rule out whether the plug at the 220V end is not in good contact, if you have nothing to remove the battery, try it with an external power supply, there is a flashing screen is a problem with the external power supply, or there is a problem with the battery on the side.

I hope it will be useful to the landlord, hopefully.

1. Judging from the situation you described, it should be the elasticity of the shrapnel in the power interface (power socket) of the notebook that has decreased or the pins of the power socket interface have been soldered. Another possibility is that the laptop's power adapter leads are soldered or the internal components are aging.

If the fault is not solved, you can only change the power socket inside the laptop and re-solder the socket pins. However, to carry out such repairs, the entire laptop needs to be disassembled, and disassembling it yourself may lead to the loss of the computer's warranty service; You may not be able to find a computer socket for your laptop yourself; There are also requirements for individuals to have sufficient maintenance experience and hands-on ability, so as to ensure that the computer will not be damaged during the computer disassembly process; In addition, some laptops require special tools to be disassembled.

Therefore, it is recommended that the laptop should be sent to the after-sales repair department of this brand for repair.

Maybe you have a problem with the charging port, try another good power supply.

When the notebook is plugged in with the battery and the power supply at the same time, the power supply will charge the battery first, and the current battery generally has a smart chip, and it will automatically switch to the power supply after the battery is fully charged, so the power supply has been plugged in, and it will not cause great damage to the battery. If you use AC power for a long time, take the battery off to be on the safe side. Recommendations:

Either only use the battery and do not connect to the alternating current, or unplug the battery and only connect the alternating current, which will prolong the battery lifeThe length of the life of a laptop battery depends on the number of times it is charged and discharged on the premise of ensuring quality.

I think the number of times I use my laptop is far more than the number of power outages. Although it will not have much effect if you do not unplug the battery, it is recommended to unplug the battery in order to prolong the battery life.

1. The power supply of the laptop is intelligent, that is, the power supply is prioritized, as long as the power is turned on, the battery will be automatically turned off and enter the power mode.

Second, you proposed "automatic switching", I don't know what it means, if it refers to the automatic switching to the battery state in the case of power supply, then it is doubtful, how do you know that it is switching, because, this kind of switching manual can not be seen.

The laptop comes with a threshold for power management.

It can be set For example, the battery power is less than 80% to start charging, then the battery level is 80%, he will not charge the laptop battery, this advantage is to avoid repeated battery charging and discharging, increase the service life of the battery, this is very smart, only some models have it, for example, thinkpad has this function, so plugged in and only go DC power, do not damage the battery, once the power is off, the battery is still on it, and it will not cause the loss of data Interruption.

The adapter is faulty, or the power port is not in good contact.

It may be caused by a virtual connection to the power outlet.

(1) After shutting down the computer, remove the battery of the computer and connect the AC power cord to see if the computer can work normally. (2) If it can work normally, disconnect the AC power supply. When used alone, the battery depends on whether the computer can work properly.

3) That is, these two situations, after all are excluded separately, depending on the battery and the connection to the AC two situations, all of which can work normally. (4) In the power management settings, see if it is a setting problem. --The above content is for your reference!

Thank you! Follow-up question: Thank you 1 Connected to the AC power supply alone, the computer works normally.

2. It is also normal to use the battery alone. If 2 are connected at the same time, the result is that the battery drains until 0. The power adapter is automatically powered off.

As a result, the power adaptation calendarer also didn't light up, and the battery ran out. The computer is turned off. No matter how much it changes, it can't be moved.

Only by unplugging and plugging in the AC power supply can Junga start. What is the reason? Added:

2) Suppose it's not a problem with the power set. Whether the landlord's computer is within the warranty period. During the warranty period, you can get the merchant for after-sales processing. If the warranty period has passed, you really can't deal with it, go to the maintenance office to take a look.

Whether it is a hardware failure.

--The above content is for your reference! Thank you! "

1.The charger may be broken 2Laptop Failure 3The power management is abnormal.

According to your last description, there is no problem with your power cord, it seems that there is a problem with the battery, the battery will be used for a long time, the charging time will become longer, and the discharge time will become shorter (it is the same as the mobile phone battery for a long time, charging for more than 10 hours, but it can only be used for an hour), so it is also ruled out that your battery has been used for a long time, so there are basically two possibilities. 1. There is a quality problem with the battery, it is recommended to replace it before the warranty period, and buy a new one after the warranty period. 2. There is a problem with the power management control of the computer, which is easy to burn or damage the battery, so contact the repairer as soon as possible.

。。Check whether there is a problem with the power socket of the book.,Or the wire at the root of the plug is open.,Who's the problem repairs.。

Don't get entangled, change the power cord or battery, if it doesn't work, take it and fix it, there is a problem with the control module.

It's the power management software that's protecting your battery.

Frequent charging and discharging will reduce battery life.

Some laptops come with a power management that has a threshold that can be set For example, the battery is less than 80% to start charging, then when your battery is 80%, he won't charge your laptop battery This advantage is to avoid repeated battery charging and discharging Increase the service life of the battery This is very smart Only some models have it For example, thinkpad has this function So that you plug in the power and only go DC power without damaging your battery Once the power is off, the battery is still on it, and it will not cause the loss of your data The phenomenon of interruption.

Personally, I think the power supply IC (a small chip the size of a fingernail) is a problem, if you change it, it will cost about 100, this IC will cost a few yuan at most, you can see if you will give 60 to 80 yuan to repair, and also, repair the notebook often forget to install the screws, remember to check it.

It's not a big problem, it's just that there is a problem with the IC that manages the power supply. I don't know how much it costs to repair this, I haven't repaired it, but I don't think it will be more than 100.

Send it to the repair station first, let the professional check it, find the problem, and then prescribe the right medicine.

It is recommended that you take it to the after-sales service center for testing, although it is over-warranted, but relatively speaking, it is more assured!