Common problems and repair methods of computer power supplies. The faults in the ATX power supplies I have repaired are usually not reflected after being connected to the power supply. 80% of the faults are caused by the lack of +5V standby voltage. Just move the base of the switch tube of the standby power supply to + It can be repaired by replacing the starting resistor between 310V and 310V. The resistance of this resistor is generally around 500K-600K, and it can also be replaced with a larger one. The reason why the standby voltage does not turn on is mostly due to the breakdown of the rectifier tube at +12V, +5V, or +3.3V, causing power supply protection, or the capacitor is short-circuited and damaged. In some low-end power supplies, there are also problems such as bulging and leakage of the main power supply filter capacitor. Repair of ATX power supply input circuit! The input circuit of ATX power supply is mainly composed of fuse, AC anti-interference circuit, current limiting resistor, overvoltage protection circuit, etc. Great Wall Power Supply claims to have double overvoltage protection, and its input circuit is quite unique.
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