Board exploding capacitors reasons
Board exploding capacitors, so I'm afraid things for most home users, may seem sensational, but it does exist such a situation, especially in the prolonged use of computers or high-frequency high-calorie CPU users, such as Internet cafes, near years have been denied large-scale capacitors motherboard burst events, the occurrence of such a situation, not only in the number of small brands, including some big brands have also seen similar things.
Why capacitance exploding it? Most of exploding capacitors are next to the CPU socket. These capacitors function as an important part of the motherboard power supply module is filtering, can pulsating DC into approximate linear DC. High temperature is the main cause of exploding capacitors, high temperature resulting in its internal capacitor electrolyte boiling, pressure increases, when the pressure exceeds the aluminum electrolytic capacitor shell to withstand stress, eventually exceeding the tolerance limit vent opening and exploding. To avoid unnecessary damage to personal items and capacitance caused by the explosion, the top of each electrolytic capacitor explosion has engraved pattern, or is the pressure release point cross trigeminal and other shapes, which is artificial create pressure weak point, when the capacitor the internal pressure is too large, the relief will be from here, to avoid an explosion, the principle is somewhat similar to a pressure cooker safety valve.
Cause board capacitor drum package
Leakage capacitor drum package ultimately because of overheating.
Capacitance effect is filtered, can pulsating direct current into direct current approximate straight line. So there will be many on the motherboard capacitors to filter out the noise associated circuit generates, especially in some motherboard around the CPU will up to more than 10 electrolytic capacitors, it is because the CPU is operating in hundreds of megabytes or even several GHz high frequencies, must guarantee clean power, then you need to use a large-capacity electrolytic capacitor filter. Since the installation of the motherboard and space limitations, only the use of electrolytic capacitors more than a small capacity (6.3V 1500μF) methods in parallel to achieve large-capacity capacitor effect. When the electrolytic capacitor capacity decreases, the CPU core voltage work will deteriorate, which will be fleeing noise and switching power supply circuit itself around the circuit to generate the waveform, then the host will exhibit extreme instability of the system, run slow down, easy blue screen of death.
How to determine the quality of the motherboard capacitors
To distinguish by color: black capacitor worst green capacitance is better, the blue capacitor capacitance than the green but also a strong point. Therefore, we generally see the CPU on the motherboard are used around the filter capacitor is green, while elsewhere others are black.
From the index difference: the scope of the capacitor voltage is very important, you can see the capacitor "+, -" the words, this is the capacitor voltage tolerance range, the smaller the capacitance value, the better.
Look capacitor capacity: According to Intel motherboard technical white paper saying, now the lowest-capacity single filter capacitor motherboard CPU socket close to 1000μF, motherboards generally use 1000μF electrolytic capacitor (can add up ah), while Intel original motherboard such capacitors with a capacity of up to 3300μF, which is one of the reasons we respected Intel motherboard stability.
Replacing the motherboard capacitor common sense
Internet cafe computer motherboard is the most common faults of capacitance and leakage split up, the question is now a common problem with some small brand motherboards. Because the current market price competition led manufacturers through the use of inexpensive electronic components to reduce costs, but now the time and frequency of use greatly increased computer off than before, so there is often a problem.
Many cafes and individuals in order to save costs, often choose to replace the capacitor, but there are a lot of people do not know the precautions, so we simply introduce the following:
1. Be sure to use the same parameters and damage the capacitor capacitance to be replaced. The main parameters of the capacitor capacitance and voltage values (such as common and have 1500uF 6.3V 2200uF 10V).
2. All capacitors sure to damage the capacitor in the circuit in parallel along replaced, because different brands of capacitor charging and discharging time is not the same, but the motherboard is very sophisticated stuff, if only the replacement of a portion of the capacitor, then will cause computer crashes and occasional basket screen.
3. We must pay attention to the choice of tools. It was generally agreed that there is a soldering iron and solder the capacitor can be replaced, it is not. You may have heard the electrostatic breakdown easily integrated chip (IC) argument, so be sure to choose anti-static tool because IC on the motherboard is up to the entire computer components. General formal maintenance company will choose a professional anti-static soldering station, we Yee foot maintenance uses 936 series soldering station, general market price is more than 400.
4. Work practices must be careful. Now the board is 6-layer printed circuit board design, we use the iron when it is easy Guaduan plate line, because a lot of people, after all, did not undergone formal training circuit welding. Circuit board very carefully and closely, touch off, then good is not easy to access.
5. Capacitance sub-brand, so the price is not the same, we must do in order to save money and reduce the capacitance mere selection criteria, that would be wasted. Ranging from the use of the process will be abnormal, weight will produce capacitor explosion caused damage to the CPU.
Board capacitor purchase skills
Computer system stability greatest impact is the motherboard, while the greatest influence on the stability of the motherboard, the motherboard is the alignment of the PCB, the circuit and the capacitor. Many people choose a motherboard usually pay attention to the circuit board and the circuit board layers alignment is reasonable, and for capacitors, usually just look at the number and too small for the brand, etc., it touches do not care. The poor stability of the entire motherboard motherboard capacitor will cause a great impact. * Rate this motherboard selection mode, also planted the seeds of future provoke scourge.
Board capacitor damage What are the consequences?
Computer motherboards bad capacitor needs to be repaired, or else is likely to lead to the motherboard north and south bridge burned, serious, video card, CPU, memory, etc. are likely to burn.
Capacitor damage symptoms are:
1. Computer auto-restart for no reason
2. boot time to boot several times in a row to start
3. The file is missing
4. sudden blue screen ...