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Hardware Knowledge Bank

The Main Cause of PSU (Power Supply Unit) Failure

What is the Power Supply Unit (PSU)

The computer PSU is responsible for the uninterrupted supply of electricity to the entire system unit. The failure of this node completely de-energizes the computer, and it stops turning on.

Cause of PSU Failure:

  1. PSU voltage fluctuations: Everything is clear: the voltage increase disables the elements of the primary circuit, which consists of high-voltage electrolytic capacitors, and a rectifier if installed without sufficient current and voltage.
  2. Poor build from an unknown manufacturer: the eminent manufacturer does not spare money for the details for the power unit. Most cheap analogs use spare parts from factory rejects, uncalibrated transistors, with a wide range of parameters. Also, a proper manufacturer always provides circuit protection in the circuit, for instance, a thermistor in the computer’s PSU, which is responsible for the current surges when the PC is turned on. If the current limits exceeded, the resistance of the thermistor drops, the fuse burns out, but, as a rule, all other parts remain unscathed.
  3. Overload of the power supply:  is a relatively frequent cause of failure when the maximum power of the power supply unit is significantly less than the total power of the devices installed in the PC.
  4. The total dustiness of the PSU: can lead to a short circuit between the tracks of the board or other parts since the dust is a good conductor. Besides, the dust adheres to the fan blade, and the speed of its rotation significantly reduced. Which can lead to overheating and without that, the heating transistors installed on the radiators?

How much wattage do I need in my PSU for the PC build?

This tool will help you to select a suitable PSU for your system. Click here for Power calculator (By Cooler Master)

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