350 r. RUB

The power supply unit is the main element of the electrics, it is through it that the energy supply of all the main parts of the system unit is carried out. Its failure will make the inclusion and correct operation of the device impossible.

The cost of the service is 350 R.

A task worth entrusting to professionals! We will fulfill it with a guarantee and in the shortest possible time!

But how to check if the computer's power supply is working, how to find out the reason why it stopped working and what to do in case of any malfunctions? This is what we will talk about today.

How to check if the computer's power supply is working

As a rule, only a professional can determine the fact of a failure and find out why the computer's power supply does not work. For this, an autonomous load is applied to the device. To perform this procedure, you will need special resistors that must be connected to the terminals.

However, before that, you also need to select the right equipment, because if the resistors are not selected according to the nominal parameters of the PSU, it will not work to establish whether the computer's power supply is really faulty.

So, after the main preparatory procedures are completed, the diagnostics begin directly.

It is done in two main ways:

• influence of the motherboard. For testing, two contacts are closed. In this case, if the connector is designed for 20 sockets, it is necessary to select wires 14 and 15, and if the connector uses 24 sockets, wires 16 and 17 will be required. In both cases, this is “start” and “ground”. If the cooler of the device is not activated, then the computer's power supply is not working. If the fan starts to rotate, the cause of the failure must be sought elsewhere.
• Correspondence of the voltage on the PSU connectors to the required values. You should immediately pay attention to the fact that certain deviations from the norm are allowed by the manufacturer. If a 12 volt device is used, the error will be plus or minus 5%. If the PSU voltage has other values, fluctuations can reach up to 10%.

If the above conditions are not met, then the computer's power supply is faulty. What to do in such a situation? More on this later.

Power supply repair

If your computer's power supply has failed, it's best not to try to fix the problem yourself. This requires subtle knowledge in electronics and the device of the PSU, as well as skills in owning a soldering iron.

If you need computer assistance, call us and Expert specialists will be happy to help you eliminate even the most serious malfunctions.

Troubleshooting these problems requires a step-by-step approach.

The power supply is a rather complicated device and there can be many reasons for breakdowns. Diagnostics and repair of the PSU should be carried out according to the following algorithm:

1. Dismantling the device, removing the cover and completely cleaning it from dust and dirt. It is they who lead to computer breakdowns in the vast majority of cases, problems with the power supply are no exception. If the dust lies in a thick layer, the cooling of the elements is difficult, which leads to their overheating.
2. Visual inspection of the power supply board. For an experienced specialist, this procedure can tell a lot. Particular attention should be paid to capacitors. In the event of a short circuit in the PSU, they swell and flow. If the radio component is enlarged and electrolyte is spilled around it, replacement is necessary. Even if there are no external manifestations of problems on the capacitor, it will never be superfluous to measure it with a multitester.
3. Measurement of transitions of low-voltage diodes. It is possible that due to any power surges they are out of order. This problem is also solved by replacing the specified element.
4. The formation of ring cracks and broken contacts can also be detected "by eye". The problem is relatively rare, but, unfortunately, it cannot be ruled out either. The solution to this problem is soldering the contacts on the board. However, it must be done very carefully so as not to aggravate the situation.
5. Fuse blown. If you are experiencing similar problems, you can consider yourself lucky. Replacing this PC element is not something too complicated. Moreover, in principle, the element can even be repaired. The fuse must be removed from the bushing, a new one installed and fixed in place by soldering.

We will help you to repair the power supply

This list of faults is far from complete; a variety of PSU elements can fail. Moreover, sometimes there are situations in which

Despite its apparent power, a personal computer is a fragile thing. To disable any part, simply careless handling of it is enough. For example, do not clean the system unit and its components. As a result, a lot of dust is formed on the parts, which negatively affects the operation of the device as a whole.

One of the most important components of a PC is the power supply. It is he who distributes electricity throughout the system unit and controls the voltage level. Therefore, the breakdown of this device can be attributed to one of the most unpleasant. Nevertheless, everyone can do repairs and fix the problem with their own hands.

Signs of a bad power supply

The most critical situation is when the computer does not respond to power button. This means that important points were missed that could indicate an imminent breakdown. For example, an unnatural sound during operation, a long turn on of the computer, an independent shutdown, etc. Or maybe such malfunctions were noticed, but it was decided not to resort to repairs.

In addition to the most critical moments, there are several signs that help identify problems in the operation of a computer power supply:

Such signs indicate the need for an early repair, which can be done by hand. However, there are also more serious problems clearly indicating a serious problem. For example:

• "Screen of death" (blue screen when the device is turned on or working).
• The appearance of smoke.
• No reaction to turn on.

Most people in the event of such problems turn to the master for repairs. As a rule, a computer specialist advises to purchase a new power supply, and then install it in place of the old one. Nevertheless, with the help of repair, you can “reanimate” a non-working device with your own hands.

The main causes of malfunctions

To completely solve the problem, you need to understand why it could appear. The most common computer power supply fails for three reasons:

• Voltage fluctuations.
• Poor quality of the product itself.
• Inefficient operation of the ventilation system, leading to overheating.

In most cases, such malfunctions lead to the fact that the power supply does not turn on or stops working after a short time. In addition, the above problems may adversely affect the motherboard. If this happens, then do-it-yourself repairs are not enough here - it will be necessary to change the part to a new one.

Less commonly, malfunctions in the computer's power supply occur due to the following reasons:

• Low-quality software (poor OS optimization has a bad effect on the operation of all components).
• Lack of component cleaning (large amounts of dust make coolers run faster).
• A lot of extra files and "garbage" in the system itself.

As mentioned above, the power supply is a rather fragile thing. Nevertheless, it is very important for the computer as a whole, so you should not deprive this component of attention. Otherwise, repair is inevitable.

Computer power supply device

The power supply in the computer is responsible for the distribution and conversion of electric current. The fact is that each element in a PC needs its own voltage level. In addition, AC power is used in electrical networks, while computer components operate on DC. Therefore, the device of the power supply is quite specific and you need to know it for do-it-yourself repairs.

In every BP There are 9 important components:

• The main board (large and flat component) - many parts are attached here (similar to the motherboard).
• An input filter (a device attached to large wires) or power capacitors (cylinder-shaped products) are needed to “smooth out” the voltage.
• A voltage invector (a large copper wire coil installed near one of the walls) or a diode bridge (a plastic device shaped like a SIM card with 4 metal diodes) is responsible for power conversion.
• Voltage control circuit (system board mounted vertically next to the inverter) - controls the current level.
• Transformer (a small plastic device with numbers and letters) - creates the necessary voltage in the power supply.
• Pulse transformer (similar to the previous component, but larger) - receives high voltage from the invector to change it to low voltage.
• A radiator (usually a gray grille) is necessary for cooling.
• A wire connector board (not present on all power supply models) is used to disconnect unused wires.
• Power drosser (usually a copper coil with multi-colored wires) - is engaged in group voltage stabilization.
• The cooler speed controller (a small plastic device, sometimes installed not on the main, but on the daughter board) - is responsible for adjusting the operation of the fan in the power supply.

Without having at least an approximate idea of ​​\u200b\u200bthe device of the power supply, it is impossible to fully carry out independent repairs.

Precautionary measures

Before you start solving a problem on a computer with your own hands, you need to think about your own safety. Repairing such a device is a dangerous occupation. Therefore, first of all, you need to work thoughtfully and without haste.

For greater security, remember a few important rules:

Required Tools

To make the repair of the power supply simple but effective, each home master will need certain tools for work. All these products can be easily found at home, asked from neighbors / friends or purchased at the store. Fortunately, they are inexpensive.

So to repair you will need the following tools:

Inspection and diagnostics

First you need disassemble the power supply. To do this, you only need a screwdriver and accuracy. When unscrewing the bolts, you do not need to shake the PSU in order to quickly fix the problem. Careless handling of it can lead to the fact that do-it-yourself repairs will be simply useless.

For the correct statement of the "diagnosis" it is necessary to carry out primary diagnostics, as well as a visual inspection of the device. Therefore, first of all, you need to pay attention to the power supply fan. If the cooler cannot spin freely and gets stuck in a certain place, then this is clearly the problem.

In addition to the fan of the product, you should also inspect the device as a whole. After a long service life, a lot of dust accumulates in it, which has a negative effect and makes it difficult for the PSU to work normally. Therefore, it is imperative to clean the product from dust accumulation.

Also, some products are out of order. due to voltage fluctuations. Therefore, it is necessary to conduct a visual inspection for burnt parts. This sign is easy to identify by swelling of the capacitors, darkening of the textolite, charring of the insulation or broken wires.

Repair manual

Finally, it’s worth moving on to the most important point - do-it-yourself PSU repair. For convenience, the entire process will be presented in the form of a list. Therefore, it is recommended not to "jump" from one point to another, but act in the following order:

No problems noticed, but the PSU does not work

It happens that outwardly everything is in order: the components are not melted, there are no cracks or broken contacts. What is the problem then? It is best to carefully examine all the details again. It is possible that some kind of malfunction was overlooked due to inattention. If no problems were found during the secondary inspection, then in 90% of cases the malfunction lies in the standby power supply or in the PWM controller using wide pulse modulation.

To fix the standby voltage problem, you need to know the basics of how the power supply works. This PC component works almost always. Even when the computer itself is turned off (not disconnected from the network), the unit operates in standby mode. This means that the PSU sends “standby signals” of 5 volts to the motherboard so that when the PC is turned on, it can start the unit itself and other components.

When starting the system, the motherboard checks the voltage for all elements. If everything is in order, it is formed response signal "Power good" and the system starts up. If there is a shortage or excess voltage, the system start is canceled.

This means that first of all on the board you need to check the presence of 5 V on the PS_ON and + 5VSB contacts. When checking, the absence of voltage or its deviation from the nominal value is usually detected. If the problem is observed in PS_ON, the reason is in the PWM controller. If the fault is with the + 5VSB contact, then the problem lies in the electric current conversion device.

It would also be useful to check the PWM itself. True, for this you need an oscilloscope. To check, you need to unsolder the PWM and use an oscilloscope to check the contacts by ringing (OPP, VCC, V12, V5, V3.3). For better ringing, the test must be carried out relative to the ground. If the resistance between the ground and any of the contacts (of the order of several tens of ohms), then the PWM must be replaced.

In conclusion

Self-repair of the power supply is a rather complicated process, which will require the necessary tools, basic knowledge about the operation of the PSU as well as accuracy and attention to detail. Nevertheless, each person, with the proper approach, can repair the unit, despite its complex structure. Therefore, you should remember that everything is in your hands.

The power supply is an important component of the system, and without it, the computer simply cannot work. It provides the required electrical energy to all consumers inside the computer case, while converting the AC voltage coming from the outlet into DC. When choosing a power supply for a computer, you need to be guided by its power, based on the number of consumers that will be connected to it. If the power supply fails, the entire computer will not work. That is why, if the computer stops turning on, it is important to check the power supply for operability, and there are several ways to do this.

Signs of a failed power supply

There is no specific symptom by which one could say that it was the power supply that failed in the computer. There are a number of signs that are characteristic of the computer's behavior in the event of a power failure. It can be stated that the power supply does not work in the proper mode (or there is another problem) with the following "behavior" of the computer:

• When you press the power button, nothing happens, that is, there is no light or sound indication and the coolers do not start to rotate. Since the power supply is a component that supplies other elements with constant voltage, it is likely that it is out of order or there are other problems with the transfer of power to computer elements - breaks in the wires, unstable AC voltage supply from the network;
• Turning on the computer does not always happen the first time. In such a situation, the power supply, poor connection of the connectors, or a malfunction of the power button may be to blame;
• The computer spontaneously turns off at the stage of loading the operating system. This may be due to intermittent transmission of voltage from the power supply to other computer components. Also, a similar problem may indicate an overheating of the power supply and a forced shutdown.

The power supply is a reliable element of the computer, which rarely becomes unusable. If the power supply is broken, the reason for this is its poor workmanship or the supply voltage through the network with constant drops. In addition, the power supply may fail if the calculation is incorrect when selecting it for a specific computer configuration.

How to check the power supply

If the computer has one of the symptoms listed above, you should not immediately blame the power supply. The error may also occur for other reasons. To accurately verify that there are problems with the power supply component of the system, it is necessary to carry out diagnostic work. There are 3 methods on how to check the computer's power supply yourself.

Step 1: Checking the voltage transfer of the power supply

To verify that the power supply is turning on, you must perform the following test:

It should be noted that this test shows the operability of the power supply to turn on. But even if, according to its results, the power supply cooler began to rotate, this does not mean that the device is fully functional. Proceed to the next steps to test the power supply.

Step 2: How to check the power supply with a multimeter

If you are convinced that the power supply receives voltage from the network and is working at the same time, you need to check whether it gives the required constant voltage. For this:

1. Connect any external resistance to the power supply - floppy drive, hard drive, coolers;
2. Next, take a multimeter set to measure voltage and connect the negative terminal of the diagnostic tool to the black pin of the 20/24-pin power supply connector. The black contact with such a connection is considered to be ground. Connect the positive probe of the multimeter in turn to the connector pins, to which the wires of the following colors are suitable, and also compare the values ​​\u200b\u200bwith the ideal voltage:

Measurement errors of ±5% are possible.

If the measured values ​​are not ideal, you can diagnose a power supply failure and the need to replace it.

Step 3: How to visually check the power supply

In the absence of a multimeter (or if additional diagnostics are necessary), you can visually check the power supply for a malfunction. For this:

When there are no problems with capacitors, it is recommended to remove all dust from the power supply, lubricate the fan and assemble the device back, and then try to connect it.

Instruction

Do not open the power supply to find faults in it. This is the lot of specialists. To determine the malfunction of this critical component, it is not necessary to disassemble the system unit. Be attentive to your computer.

Remember if there are frequent reboots and freezes of the computer for no apparent reason (during the computer performing simple tasks). Note for yourself the appearance of errors in the work of programs and the operating system as a whole. Errors in the functioning of RAM during testing and during further work in the system. Interruptions in the operation of the hard drive or the failure of the latter indicate a power failure at the output of the power supply.

Pay attention to the appearance of an unpleasant odor and excessive heating of the system unit. These are undoubted malfunctions of the power supply of your computer.

If the computer does not show signs of life, you will have to disassemble it. Disconnect the power cable from the system unit. Take a screwdriver. Unscrew the screws that hold the wall of the system unit to your right. Remove the cover to access the motherboard.

From the motherboard socket, remove the main plug of the power supply connector, which has 20 or 24 pins. Find the third and fourth pins, green and black wires lead to them. Close these two contacts using a regular paperclip. Connect the power cable. In a working power supply, the fan will start, and voltage will appear at its terminals.

Measure the voltage with a voltmeter. Between the contacts of the black and red wires, it will be 5 volts, black and yellow - 12 volts, black and orange - 3.3 volts (minus on black, and plus on colored ones). If the values ​​you received differ from the above, your power supply is defective.

Many users are concerned about whether their computer is "powerful". At the same time, the main difficulty is that the computer demonstrates different performance in different tasks, and, in general, there is no single numerical expression for “computer power”. There are a huge number of testing programs that determine the ability of a computer to perform certain tasks, with varying degrees of specialization.

You will need

• Computer, basic computer skills, test software packages 3DMark, PassMark or similar

Instruction

Microsoft came closest to creating a single rating scale. In the latest versions of their operating systems, there is such a feature as computer performance. To use this feature, activate the Computer tab in the Start menu. In the window that appears, select the "System Properties" menu item. Find the line "Rating", which displays a certain. This is the evaluation of the performance of the computer. By clicking on the hyperlink "Windows Experience Index" located nearby, you can find out what components the score consists of. The disadvantage of this estimate is its very low accuracy and low information content.

The remaining methods for determining the "power" of a computer are focused on certain types of applications. One of the most popular benchmark suites, 3DMark, mainly determines the computer's . To find out your computer's "gaming score", install 3DMark and run a standard test. You will receive a number in points, which will display the power of the computer in games. You can compare your result with others on the Internet.

The computing power of a computer is determined using other test programs, one of which is PassMark. After completing it, you will receive an estimate of the processor power, also in points. The developer's website contains huge statistics of the tests performed, and on it you can compare your result with the ratings of other users.

note

For a long time, a beard-covered instruction on how to determine the gender of your computer has been walking around the Internet for a long time. To determine if your computer is male or female, open Notepad and copy the following text without the outer quotes: "CreateObject("SAPI.SpVoice").Speak"I love you"".

Helpful advice

In order to find out what gender your computer is, you need to do a very simple operation: 1) Open notepad. 2) Copy this phrase into it - CreateObject("SAPI.SpVoice").Speak"I love you". In general, GetVoices - gives out a voice preinstalled in the system. With the help of the search, you can sort through the votes and choose the one you like if the existing computer gender does not suit you.

Sources:

• Pass Mark
• how to find out the gender of a computer

The power of the power supply is a very important characteristic of the computer, which is designed to ensure its uninterrupted and full functioning. The higher it is, the better. But there is a minimum value that must match the characteristics of the computer.

Instruction

The more powerful the "" computer, the more powerful you need. As a rule, the power manufacturer on the unit itself is on a special sticker. To find out the required power, there are various services. ASUS has a corresponding form on its website, after filling in which the program will give the desired value based on the maximum possible computer components.

In the CPU section, specify the parameters of the manufacturer of your processor. In the "Select Vendor" field, specify the manufacturer of the core, in the CPU Type, select the processor family, and in the "Select CPU" field, specify the model itself.

In the VGA Card section, the values ​​\u200b\u200bof the computer's video card are indicated, where Vendor is the manufacturer of ATI or Nvidia, and in "Select VGA" the video card model is indicated, which can be found in the control panel of the card driver (right key on "My Computer" - "Properties" - " Device Manager" - "Display Adapters").

In Memory Module, specify the type of RAM used (DDR, DDRII, DDRIII).

In the Storage Devices menu, specify the number of devices connected to the computer for writing and reading. In the USB section, specify the devices connected to the USB. In item 1394, check the presence of an additional video capture card, and in the PCI section, select the available devices (Modem, Network (LAN), Audio, and other PCI card - the number of network devices and sound cards connected to the PCI slot in the motherboard, and SCSI card - the number of cards to connect the SCSI bridge).

The program will automatically give the optimal value, which must not be lower than that indicated on the sticker of the power supply. Otherwise, the unit should be replaced with a more powerful one at a computer repair service.

Sources:

• ASUS Optimum Power Test Service

When buying computer equipment, it is very important to pay attention to such a characteristic as the power of the power supply. It is she who ensures the constant operation of technology. In this case, it is desirable to take into account the fact that the power should be sufficiently high.

You will need

• - Internet;
• - computer.

Instruction

To determine the required power, there are various services where you can find out the necessary information. For example, go to the ASUS website ( http://ru.asus.com/) and fill in the required form there. After that, it will determine the required power supply power value, guided by the maximum power consumption of the computer components.

To see the required power, you can also go to the service page. Enter the Motheboard field, select Desktop (when using a home system) or Server (when testing a server). In the CPU field, you need to specify all the parameters of the processor manufacturer of your computer. In this case, the manufacturer of the core is indicated in the "Select Vendor" item, the processor family - in the CPU Type, specify its model in the "Select CPU" field.

Next, in the VGA Card field, you must note the value for the computer's video card. In the "Select VGA" item, specify the model of the video card. To find out this information, right-click on "My Computer", then follow the following chain: "Properties" -\u003e "Device Manager" -\u003e "Display adapters". After that, in the Memory Module field, indicate the type of RAM used in your computer.