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This article mainly introduces xp system motherboard short circuit how to repair the relevant knowledge, detailed and easy to understand, simple and fast operation, with a certain reference value, I believe that everyone reading this xp system motherboard short circuit how to repair the article will have some harvest, below we take a look at it.

General maintenance ideas for motherboard short circuit:

(1) Motherboard short-circuit fault phenomenon: plug the power supply current directly to 5A, the voltage is pulled down to 0V or close to 0V, and some of the motherboards will have a burnt smell.

(2) Motherboard short circuit maintenance detection method:

First, carefully observe whether there are traces of discoloration and burning in various parts of the motherboard.

Generally speaking, when each component is short-circuited, due to the consumption of large current, it will cause the component to heat too high and appear appearance bulging or discoloration zoom. If there are burnt elements. Judge the function and position of burnt component, and then analyze the cause of component damage.

Generally, there are two reasons: ① the component itself is damaged;② the short-circuit of the latter stage causes the component load to be too large. After the judgment is good, replace the good component.

If the motherboard is still shorted after replacement, continue to check.

2. Set the current threshold of the regulated power supply to be smaller to prevent excessive current from damaging other components of the motherboard, or excessive current from generating heat (hot).

You can first set the current of the regulated power supply at about 1A, then plug in the power supply, gently touch it with your hand, find the heating element, if found, replace it; if you can't find the obvious element, increase the current, continue to find.

3. Repair common short-circuit components.

(1) Ceramic capacitor:

Ceramic capacitors are multilayer chip structure, the principle is that two charged conductors close to each other, insulated from each other, will accommodate charge. The two ends of the capacitor cannot be connected. Ceramic capacitor damage fault phenomenon is short-circuit breakdown, use multimeter to measure, resistance 0 ohms. And will not be due to the increase in current and open circuit, will always remain in a short-circuit state, and will produce high temperature. Appearance can be seen at both ends of the contact corrosion traces. Ceramic darkens or becomes uneven in color. Generally in the main power supply or common terminal filter ceramic capacitor damage probability is relatively high.

(2) High and low MOS transistor:

The role of the high and low end MOS transistor in the circuit is DC-DC voltage reduction, converting the voltage of the adapter into the various voltages required by the motherboard. The high and low end MOS transistors are generally N channels (only a small number of charge and discharge chips will use P channels), and the phenomenon of high and low end MOS damage is breakdown. Use a multimeter to measure the path formed. The common reason is that the MOS tube G pole loses the control signal due to water or damage to the power supply control core (MOS tube can not be directly powered when there is no power supply chip, otherwise it will directly lead to breakdown damage). If the MOS tube is damaged, the cause of the fault should be considered comprehensively to prevent the short circuit after replacement, resulting in the burning of the subsequent components.

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