It must be the motherboard burned, please everyone, 3Q

It doesn't have to be the motherboard burning, it may be the motherboard's short-circuit pulling, depending on what your computer is going to do? There can also be a number of reasons.

Before changing the motherboard,Replace the power supply together.。。。 Kanegawada 300w is only a dish.。。 There are 2 things that the computer can't save the most, motherboard and power supply, the cost should be enough MSI K785GTM-E45 sells well, small blackboard, it looks better, and the HD4200 on board is also possible, and it can also support AM3, but the board is a little smaller.

GIGABYTE 78GM-S2H is average in workmanship and has no features, that is, it is cheap.

Start by checking that the contact is good. Check whether the contact between the graphics card and the monitor is good, and whether the contact between the graphics card and the motherboard IO slot is good, and if necessary, remove it and reinstall it again to ensure that it is installed in place and in good contact. If there is no problem with contact, it is best to try a different monitor to make sure that the monitor is fine.

If there is no problem with the monitor, check whether the CPU fan is running, if it is running, use a multimeter to measure whether the voltage output is normal to 12V, 15V, if not, you can change the power supply to give it a try. If the black screen still appears, take out the components installed in the computer, leaving only the CPU, graphics card, and memory sticks, and the cause of the fault can be limited to the CPU, motherboard, and memory. Generally, if there is a fault in the memory, there should be an alarm sound.

If the memory fault is ruled out, only the CPU and the motherboard are left. Change to a normal CPU (should be compatible with the tested computer), boot the computer and re-test, if the black screen still appears, you can only change to a motherboard, and the problem should also appear on the motherboard. A black screen may indicate a serious problem with your computer, and you may wish to eliminate it as described above when the black screen occurs.

In the process of treatment, the method of exclusion and substitution should be flexibly applied, and the phenomenon that occurs in a timely manner should be excluded.

If the motherboard doesn't even reflect the basics, then it should be that the chipset is broken, see if it can be repaired, I've helped people do this before, and it's usually sent back to the original factory for repair.

Yes, it can be turned on to prove that the power supply is okay and that is the motherboard.

Brand model: RedmiBook Pro 15 System: Windows 10

If the motherboard is burned, there will be symptoms such as fan not displaying, BIOS garbled code, burnt smell, crash, blue screen, etc. A motherboard, also known as a motherboard, is one of the most basic and important components of a computer. The motherboard is generally a rectangular circuit board, on which the main circuit system of the computer is installed, generally there are BIOS chips, IO control chips, keyboard and panel control switch interfaces, indicator plugs, expansion slots, DC power supply connectors of the motherboard and plug-in cards, etc.

The motherboard has an open architecture. Most motherboards have 6-15 expansion slots for PC peripherals to plug in control cards. By replacing these plug-in cards, the corresponding subsystems of the microcomputer can be partially upgraded, so that manufacturers and users have greater flexibility in configuring models.

In conclusion, the motherboard plays a pivotal role in the entire microcomputer system. It can be said that the type and grade of the motherboard determine the type and grade of the entire microcomputer system, and the performance of the motherboard affects the performance of the entire microcomputer system.

Is it ...... that the power supply is broken?

Even if it is broken, there should be a reaction, a warning tone appears, or something prompts, you take the battery off and plug in the adapter directly. If the adapter can start, it's a battery problem.

The laptop cannot be turned on generally due to the following situations, and a code training treatment can be made according to the symptoms of the notebook:

1. The power supply of the notebook is insufficient;

The laptop power supply is low. This situation is caused by excessive use of the laptop or excessive power consumption of the battery that has been standby for a long time, and as long as you charge it more before use, this problem will be solved.

Maintenance of laptop batteries.

Second, there is no reflection when the machine is turned on;

There is no reflection when it is turned on. This type of situation is generally caused by loose hardware or water ingress into the notebook. If the hardware is loose, just open the notebook and reinsert the loose hardware; However, due to hardware damage, the damaged hardware should be replaced after testing with a professional instrument.

Example of a notebook disassembly.

3. When the machine is turned on, it prompts that the serial port, parallel port, hard disk, etc. cannot be recognized;

When the computer is turned on, it prompts that the serial port, parallel port, hard disk, etc. cannot be recognized. This type of situation is usually caused by loose hardware or the same error of COMS data, and can only be troubled by reinserting the loose hardware and restoring COMS data.

Fourth, the computer cannot enter the system after the alarm is turned on;

The computer alarm cannot enter the system. Whenever the computer starts up, it sounds "Flute." The alarm hail sound of the "flute" is caused by hardware errors or damage. This kind of fault needs to be repaired according to the different alarm sounds.

Click the link to view common memory alarm solutions.

5. Operating system problems.

The operating system is unable to boot due to the question. This type of source family problem is always reflected in an error or reboot when the system is booted after the hardware test is completed, and the solution is to restore the system or reinstall the system.

The structure of the computer motherboard is relatively complex, the failure rate is relatively high, and the fault distribution is also scattered. According to the source of the fault, motherboard faults can be divided into power supply faults, bus faults, component faults, etc. The main causes of motherboard failure are as follows:

1. Component reasons: The quality of chips and other components on the motherboard is not good, resulting in aging and damage to the motherboard, resulting in motherboard failure.

2. Human reasons: When using the computer, hot-swap the hardware at will or touch various connectors with metal objects indiscriminately, resulting in the failure of the motherboard.

3. Dust and static electricity causes: due to dust or static electricity, the motherboard is in poor contact, short circuit or burns the chips on the motherboard, resulting in the failure of the motherboard.

"The fan turned a little", usually you are looking at the CPU fan.

This question can be analyzed in this way. It must be that the motherboard system (motherboard, CPU, memory, graphics card, expansion card) has a short circuit at the moment of power-on.

Step 1: Try to replace it with a normal power supply, first of all, you must rule out whether it is a power supply problem.

Step 2: (Under normal power supply) Take the motherboard out of the chassis and run naked, the slight deformation of the poor chassis will cause a short circuit in the motherboard. Direct motherboard and CPU fan, short power on, see if it is still the same fault situation, if so, then the problem is on the motherboard, take a closer look at whether there are any burn marks (motherboards with obvious burn marks usually cannot be warranted, I don't know who prescribes).

If you find that some capacitors are burned (this is the easiest to see), take it to the computer city to repair the second-hand motherboard, usually 20-50 yuan to replace it.

Step 3: (If the motherboard is running normally) then install the CPU, memory, graphics card, etc. one by one to see if the problem is in the **, and the replacement method will show its might.

setp 4: There's also a possibility that if you run naked, everything will be normal. Put it back, play more games or something, there's something wrong.

The problem is usually that the capacitor on the motherboard can not be discharged normally, and when I encounter such a machine, it is to add a grounding wire to the motherboard, and it is OK from then on.

What do you mean by having a fan, is it a ** fan, a power supply fan or a CPU fan? Generally, after the computer is connected to the power supply, there is a light on the motherboard that will turn on, if the light is not on, it may be a problem with the power supply. The simplest problem I've ever had is when the power cord I'm using suddenly breaks.

I never thought it was it, and I just changed the power cord in the end. If there is no problem with the power cord, it should be a power supply problem.

The soldering iron of the MOS tube is more difficult to dismantle and requires an air gun. After the replacement, it is necessary to confirm whether the other surrounding components are in good condition before powering on. If you have no maintenance experience, it is recommended to send it for repair.

This is the MOS transistor, which is the MOSFET.

The circuit here is to power the CPU. Generally, if it is broken here, it needs to be replaced with a set of MOS tubes, that is, the originals in my circle, and sometimes they have to be replaced.

After the change, it is necessary to use a multimeter to measure the ground resistance value of each group, and confirm that it is the same before powering on the test machine.

Changing the CPU power supply has a certain chance of burning out the CPU, so it is generally not recommended to change it yourself.

In addition, the mos tube in your circle has been moved, and the craftsmanship is a little rusty, and there are actually popping beads, and the arrow points to.

The main board industry rules, the board that has been touched by others, generally do not connect.

The MOS tube, also known as the field sensing tube, is responsible for regulating the current by switching the tube.

Big brother, which specific one needs to be measured if it is burned, but visual inspection is not possible.

Generally, the motherboard has not been repaired, and it is replaced with a new one.