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It should be static electricity, before contacting the chassis, static electricity is sometimes brought to the chassis by the user himself, in the high-temperature, dry room is a high-risk area for generating electric charge, due to the low air humidity, chemical fiber clothing, carpets, cushions, etc. are rubbed, static electricity will be generated. When static electricity accumulates to a certain voltage, it is released, which is the phenomenon of "electric shock". When the user's hand is in direct contact with the board card and memory chip in the case, static electricity will instantly enter the internal circuit from a pin of the chip, burning the transistors and metal wires in it, causing invisible damage.
Therefore, before opening the chassis, you need to first dissipate the static electricity on your hands, such as touching metal objects such as doorknobs and water pipes, or touching the wall or wet towel with your hands to "release" the static electricity in your body. The best thing to do is to wash your hands so that static electricity runs away with the water, and then dry your hands before opening the case.
Inside the chassis, the power supply will also generate a large amount of static electricity, especially the capacitance of some inferior power supplies is cut corners, and the static electricity is released nowhere, and it will run into the chassis outside the power supply, so the chassis must be grounded. In this case, a power strip with a ground cable is required. At the time of installation, many users are accustomed to asking the merchant for a power strip giveaway, and the merchant will naturally not give you any high-quality products, so many cheap and inferior power strips are used at the power inlet end of the computer.
If the ground wire is omitted in these inferior strips, then static electricity cannot be released through the ground wire.
Then we can build this ground wire for the chassis ourselves, first find a wire. Peel off both ends to expose the copper wire, and tighten the screws by wrapping one end around the metal screws of the case. Tie the other end to the water pipe, heating pipe or aluminum window (make sure they are connected to the ground) to prevent static electricity.
It should be noted that do not tie the grounding wire to the gas pipe, as the electric spark of static electricity will cause the gas**, which will be very dangerous.
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I support the above statement, if it's correct, it's static electricity, because there is more current in the host place, and it's metal, so there's nothing to worry about, unless it's leakage, you can check the wiring of the host, the wiring.
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The computer case enclosure may be charged due to the following reasons:
1.Grounding problem: The computer case case should be connected with the ground wire, if the ground wire is not connected properly or is not grounded, it will cause the case case to be electrified.
2.Power supply issues: There may be a faulty power supply that is causing current to leak onto the chassis enclosure.
3.Maintenance Problem: When repairing the computer, it may be misoperated and the chassis shell may be electrified.
4.Static electricity problem: In a dry environment, static electricity will accumulate in the human body, and when touching the chassis shell, it may cause the chassis shell to become electrified.
If the computer case case is electrified, you should disconnect the power supply immediately and check the above reasons to ensure that the computer is safe to use. If you are unsure about what to do, it is advisable to seek professional help.
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If it's an old car and a second country, you can find a few people to push the cart, and the speed is fast and it's in gear, pushing. After the third country, you need to give enough electricity to let the engine reach a certain speed. You can call the repair shop to bring the battery over and troubleshoot the problem.
It is estimated that there is a problem with the battery interface.
220v?It will kill people's virtues. The maximum voltage that the human body can withstand is 36VLet's go to the hospital for a check-up. This is no joke! I wish everyone in the world a safe life.