computer leakage how to do 1. computer chassis leakage how to do
found leakage, we first want to confirm their use of the electrical plug board has a good grounding design, if not immediately replaced (including home in the more common in-wall electrical outlet), with a good grounding, even if the generation of leakage, but also to reduce the harm and damage to the minimum. Minimize the damage.
Open the chassis, look at the wiring inside and outside the chassis, insulation package is not broken, the metal part of the wire there is no *** and contact with other accessories and chassis, there are immediately be replaced. Or directly choose to have nylon mesh wrapped wire, which can also play a better insulation effect.
Excluding the wire and socket grounding problems, in view of the previous analysis, the chassis leakage rate of the largest culprit is the power supply, we go from the power supply to start, disassemble the power supply to see if the power supply EMI circuit is intact, the interval between the components of the power supply between the metal casing of the plastic film sheet or mica sheet there is no loss of insulating effect of power supply capacitance inside the pulp, etc. If there is a problem, you can build a high-temperature plastic film, between the components and power supply shell to form a shielding barrier, such as can not be resolved immediately replace the power supply. Check the motherboard inside the chassis, graphics card, check whether there is no PCB board deformation and other circumstances leading to direct contact with the chassis.
The method of checking the best way to use a minimized system, on the one hand, to make the platform more simple and easy to judge, on the other hand, you can avoid unnecessary damage to hard drives and other accessories in the testing process. Check the chassis itself, the general chassis front panel rear, there is a connection to the motherboard audio, signals, switches, USB extension of the PCB circuit board, we also need to check the circuit board and connect the circuit board on the wire there is no insulation failure, component short circuit, burned, if any, with the help of simple electrician common sense and electrician tools to repair or replace it.
Of course, we can also place the chassis to a dry location (such as the original placement of more humid location is prone to cause wire short-circuit), replace the bottom of the insulated shoes and other methods, the full range of judgment, and ultimately find the culprit of the leakage.
2. Seek help
The host leakage problem is because the host power supply used at present must be certified by CCC, manufacturers in the factory are also after a rigorous test of anti-electrical strength to ensure that the power supply in line with the requirements of the national standard.
In the case of ungrounded hand touch chassis will appear "numb hand" feeling, that is because the host power supply in order to inhibit electromagnetic interference, in the power supply input side of the Y capacitance of the cause, although the transformer and other edge of the material will be superimposed on the leakage current, but the main Y capacitance of the existence of the main cause. When the normal grounding, because the capacitor is "through-current", the resulting leakage current flows into the protective ground, so there is no abnormality in human touch.
When the case is not grounded, due to the high impedance of the Y capacitance and the multimeter, the impedance value is comparable, so 220V ~ input voltage, the multimeter can read the value of the general will be in the 100V ~ 220V between (with the humidity of the air, the Y capacitance of the different values, the value will be different). By the same token, when not grounded, touching with human hands (the multimeter is replaced by a human body), the human body will have a voltage, due to people, air humidity, Y capacitance, floor and other factors, this voltage can sometimes be felt, and sometimes not.
Solution: We recommend that customers connect the ground wire at home and buy a good outlet plate, or ask customers to use a wire to connect the chassis to the ground to eliminate the suspended voltage due to the Y capacitance. For the keyboard part of the button leakage problem is due to the part of the button using gold-plated material has a conductive body, the monitor screen leakage phenomenon is the same reason.
Description: host leakage phenomenon is in order to pass the "3C" and "EMI (electromagnetic radiation)" certification produced in order to reduce the computer electronic components of electromagnetic radiation on the human body, the power supply components to join the "Y capacitor". "Y capacitor", Y capacitor is a leakage capacitor, when the computer is energized, it will be generated by the electronic components of electromagnetic radiation through the ground to the ground, reducing the harm to the human body, when the ground wire is not connected or not connected, the human body contact may have the feeling of electric shock. .
3. Computer host leakage how to do
First! You have to determine whether the leakage or static electricity, the method of judgment is every time you touch the computer with a strip of wire before one end connected to the water pipe, and then connect the other end of the computer shell, and then you touch with your hand, if it is okay, it is static electricity, otherwise it is a leakage, leakage of electricity, you can not deal with it, or resistance to go to the maintenance bar!
If it is static electricity, look at your chassis plug is a three-pronged plug, if it is, then it is estimated that your home line ground is not connected to a good, in this case, you have two choices: 1 to find an electrician to detect your home line is not installed or socket ground connector inside the loose (if you are familiar with the line that is not a problem) 2 to find a wire screwed to the back of the chassis screw, the other end connected to the water pipe (the water pipe). The other end of the connection to the water pipe (water pipe grounded good, you if only connected to the ground or window on the effect is not good, dry as possible static electricity)
2: grounding line these are good, I also wear shoes touch chassis
Static electricity is generated because of the existence of a potential difference, the same as the difference in water pressure, the kettle of water poured into the cup because there is a difference in water pressure, and the cup has no wear bottom (wear shoes)
This is the first time I've ever seen a cup of water.
3: My monitor does not leak for a while
That's because the monitor case is not prone to static buildup.
4: There is also the fact that when I plug in a USB flash drive, the metal part of the flash drive is electrically charged.
Of course it is, that metal part connects to the chassis metal part.
I'll organize it a bit more, just answer these.
A: How have you dealt with leaks like this before? Is it better to ground it with a metal wire or with a direct power change?
My house has a direct ground wire coming in from the power supply, and then all the sockets, lights, and appliances were grounded during the renovation, so it doesn't and hasn't happened.
B: I don't use metal wires, can I put the case directly on the ground? (I live upstairs, how to dig is also concrete.)
No, it doesn't work well when it's dry, and I don't think your concrete floor is very wet ^_^
C: Will the chassis leakage like this lead to leakage on my monitor?
No, the monitor is plastic!
4. chassis leakage how
1, chassis leakage causes: power damage Solution: we need to disassemble the power supply, and then check whether the built-in emi circuit is intact, and then check the mica, plastic film sheet and capacitors, if any of the originals appeared to be the case, even if the replacement.
For example, if the plastic film is damaged, we need to buy high-temperature-resistant materials, a homemade film can be. 2, chassis leakage causes: motherboard damage Solution: In general, we touch the chassis, if you feel a very obvious "hemp" feeling, it means that the motherboard leakage, damage.
At this time, we first minimize the system, which can reduce the damage of accessories in the test process. Then, we need to shut down the computer to see if the cable is touching other motherboard originals, and finally remove the motherboard and replace it.
3, chassis leakage causes: chassis damage Solution: We will disassemble the chassis, we will find a circuit board in the chassis, this circuit board can be connected to the u ***, switches, audio, and signals, so we need to check the circuit board above all the wires whether the phenomenon of insulation, short-circuiting of components can also cause leakage, burned the status quo. At this time, we need to use electrician tools to replace them.
4, chassis leakage causes: external wiring In many cases, in fact, the chassis leakage does not mean that the chassis of the reason, it may also be because of other electrical appliances and chassis distance is too close to the chassis, so that the chassis may be touched on the side of the wires, this time will cause leakage of the phenomenon. Repair, we do not have to dismantle the chassis, only need to check the outside of the chassis wire, to see the insulation skin has not been broken phenomenon, if the metal part of the *** out of the need for timely replacement.
We need to buy the best nylon mesh skin material, so that the phenomenon of leakage will not occur again.
5. How to solve the computer leakage ~
The reason why the chassis is electrified:
1, because your power cord does not have a grounding wire;
2, you connect the computer plug to change the direction, it may also be resolved, this is because your USB to be divided into positive and negative poles. I use the USB is the same, if not change, USB and chassis will be charged, as long as the plug wire connected to the USB power supply in a different direction into the plug, the chassis on no electricity.
3, your motherboard somewhere with the chassis directly have contact points conductive.
4, power leakage.
There is another way to say it:
The chassis "leaks" because the power supply is of good quality, good power supply leakage, bad power supply does not leak. Forwarding (Jin Hetian, Zhang Yinan) "According to the national standard on electromagnetic compatibility (EMC, EMI) and safety requirements.
The main element of EMI design is the design of noise filters. The use of switching power supply filters can effectively inhibit the noise in the power grid into the equipment (power supply), but also can inhibit the equipment (power supply) generated by the noise pollution grid. There are two kinds of noise, one is *** mode noise and one is differential mode noise. The *** mode noise is the current flowing into the earth, and the differential mode noise is the current between lines.
In order to suppress these noise pollution must be used to filter the circuit, in order to suppress the work **** mode interference in the input of the two lines L, N line and two capacitors to ground. Capacitor has a great role is to isolate the straight through the intersection, (general noise high interference are high-frequency signals, can be approximated by the understanding of the main AC signal). If grounded, this part of the interference signal into the earth, to achieve the role of filtering.
If you are not grounded, if people contact the human body into the human body. That is, we understand the phenomenon of leakage. (This part of the voltage for the AC, generally up to 110V or so). The solution is still must be grounded.
6. My computer leakage
Computer chassis leakage
Add a ground wire to solve the computer chassis leakage
Many computer users in the process of using the computer users will encounter such a thing, when touching the chassis with their hands to prepare for shutdown or unplugging the USB flash drive, there is a feeling of "electric shock"; When touching the monitor (CRT) screen, there will be a "discharge" feeling; and even when we unplug the pin printer cable (in the case of printer shutdown, this is not allowed, the correct operation is the printer, the host all off before being able to unplug the LPT cable), or rotate the volume knob of the speaker, there will also be "electric shock" feeling. The LPT cable can also be turned off when you turn the volume knob on the speakers, or when you turn the volume knob on the speakers, which can also smell like electricity.
Most of the time, when we are "electrocuted", we don't feel much, just numbness, but sometimes we may feel like being stabbed by a needle. Because we are afraid of being shocked, when such a thing, some users will take the test pen to contact the metal part of the box to determine whether there is electricity. This test does not matter, the neon bulb in the test pen red. Then use a multimeter to measure the voltage, almost 200V, which do not electrocution. What's more, there is a problem with the computer. Is this really the case? Why is this the case?
In fact, the reason is very simple, just because the customer's home power outlet does not have a good grounding or no grounding at all. Although we are afraid of the computer chassis or monitor CRT screen, as well as speakers, printers, metal parts of the leakage, do not know the real reason, often mistakenly thought that the quality of the computer has problems. In fact, many brands of computers sold on the market use
manuals have detailed instructions, most of which have the following words.
But in fact, most consumers buy computers home, almost no one to carefully read the manual, no one in the use of computers in order to security and stability must be grounded, and no one to consider the use of two-wire TV plugs,
and computers, printers, monitors, but the use of three-wire plugs for the reason, so when the computer problems, it is very sure that the computer is a problem. The computer is very sure that there is a problem with the computer, or not busy call the repair, or not to the Consumer Council to complain. And the final result? The only thing you need to do is to install a ground wire, and all the problems will be solved.