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Hello everyone, in this lesson we will take a look at the short circuit repair process

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The short circuit here refers to the short circuit of the power supply on the graphics card.

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The fault phenomenon of short circuit is that, except for the core power supply, their ground value becomes 0

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When repairing short-circuit faults, the burn-in method is generally used.

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But there are different maintenance methods for different voltages

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Let's first look at the 12V gold finger short circuit

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The short circuit of the 12V gold finger is generally caused by the breakdown of the upper tube,

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or the short circuit of the capacitor

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12V power supply short circuit is not able to directly burn the machine

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It is necessary to eliminate the breakdown of the upper tube before burning the machine

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Because the 12V power supply will be converted to other power supplies on the graphics card

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If there is a problem with the power supply chip, short the 12V and back-end power supply together

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At this time, if we burn 12V, it may burn the power supply at the back end together,

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which may expand the fault

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Therefore, we must first rule out whether the upper tube or the chip has a breakdown

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So how to rule it out?

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We need to measure the resistance between the 12V golden finger power supply and each power supply

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If the measured value is 0, then the upper tube of this power supply may break down

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You need to remove its power supply chip or upper tube,

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and then measure whether the 12V is still short-circuited

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If there are multiple upper tubes for this power supply,

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then it is necessary to measure the G poles of each upper tube

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If there is an abnormal value of the upper tube G pole to ground, this upper tube is generally broken down.

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We'll test it after we tear it down

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But we often encounter a situation during maintenance, the ground value of 12V is 0,

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and the ground value of the core power supply is also 0

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Then when measuring the resistance between them, the value is also 0

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And the core power supply adopts DRMOS power supply mode

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In this case, we have no way to judge whether the DRMOS has a breakdown

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And DRMOS does not have a G pole

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Then we can only disassemble the DRMOS one by one to judge whether there is a breakdown

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After confirming that there is no breakdown, you can directly use the burn-in method to burn-in

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When burning the machine, you need to pay attention,

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the burning voltage must not exceed its original voltage

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For 12V, we recommend generally using about 1V to burn

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Let's look at the short circuit of the 12V power supply

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Its maintenance method is the same as that of 12V gold finger short circuit.

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Refer to the repair method of 12V gold finger short circuit.

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Let's look at other power supplies

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3V gold finger short circuit

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N card is generally not a big problem, you can directly burn the machine

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The A card may be damaged by the GPU.

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5V short circuit is generally a small chip or a small capacitor short circuit, you can directly burn the machine

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And 1.8V power supply, bus power supply and video memory power supply,

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after these three power supplies are short-circuited, there is a high probability that the GPU is damaged

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If the burner can't burn out, then there is no need to repair it

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I did not list the core power supply here, because the ground value of the core power supply is 0

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It is impossible to test whether it is short circuited by using an ordinary three-and-a-half-digit multimeter.

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And after the core power supply is short-circuited, the core is also damaged, and there is no need to repair it

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So there is no core power supply written here

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Generally speaking, short circuit fault is a relatively easy fault to repair.