What is the function of the capacitor on the graphics card?

There are various types of capacitors on graphics cards, nothing more than filtering, energy storage, bypassing, and decoupling. These are also the main functions of capacitors. For example, the large electrolytic capacitors on the power supply are used for energy storage. It is to store the electric energy in the capacitor first, and then release it. In this way, if the power supply is unstable or the current fluctuates from high to low, the capacitor can smooth the current. Generally, filtering and energy storage exist at the same time. The capacitance is generally a few hundred microfarads or thousands of microfarads.

Bypass, on the power supplied by the power supply, it will inevitably be interfered. In addition, there are various large and small chips on the graphics card. Each chip is afraid of interference, but it will also cause interference. For high-frequency and low-frequency, bypass is The interference of the high frequency part is introduced from the positive pole of the power supply to the negative pole through the capacitor, so that the high frequency part is filtered out. This capacitor is generally a few microfarads or a few fractions of a microfarad.

Decoupling is similar to bypass. Due to the different power consumption of each chip, the current may fluctuate high and low, which will inevitably affect the operation of other circuits. In order to prevent interference between each level, it is in the chip's Connect a capacitor near the power supply pin. This capacitor may be tens of microfarads or 100 microfarads. The role of this capacitor is similar to that of energy storage.

The main reasons for the explosion of the electrolytic capacitor are as follows:

1. Capacitor quality problem

The quality of the capacitor is not good enough to reach the marked withstand voltage and heat resistance value, which objectively causes the capacitor to work excessively. A longer time or a larger voltage fluctuation will cause the capacitor to burst.

2. Heat dissipation problem

The long working time of the graphics card, coupled with the large amount of heat generated by itself, will cause the capacitor to remain in a high temperature state for a long time. If the temperature exceeds the rated temperature range of the capacitor, the volume of the electrolyte will increase. For water-based electrolyte, bubbles will be generated, and the protection valve of the electrolytic capacitor will eventually burst.

3. Voltage and current problems

If the computer’s switching power supply or motherboard power supply components fail, the instant voltage and current loaded on the graphics card capacitor will increase. If the capacitor’s withstand value is exceeded, the electrolyte temperature will rise, and eventually the electrolyte volume will increase seriously. And break the capacitor case.

The function of the capacitor is to stabilize and filter. Once damaged, it will affect the stability of the computer components. In severe cases, the component will be broken down due to the inability to suppress the instantaneous strong pressure and strong current. In addition, the electrolyte has a strong corrosive effect. Therefore, after the electrolytic capacitor is damaged, the components of the same model should be replaced as soon as possible.

Can the graphics card capacitor be used if it bursts?

It is best not to use it first, and to use it after the repair. analyse as below:

1. If the capacitor explodes, it will generally cause voltage undervoltage. If the voltage is used for filtering, it will cause current instability and interference. Find a computer repair shop and replace the exploded capacitor.

2. The capacitor has exploded. If it is still in use, there is no problem on the surface. After a long time, it may burn out other electronic components on the graphics card. At that time, the graphics card will be completely out of work.

3. You can buy a few of the same capacitors according to their withstand voltage and capacitance. If you have welding skills, you can do it.