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In this lesson, we will talk about how to repair the leakage of the main power supply

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We mentioned earlier that

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the electrical leakage is related to the positive line of the battery

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and the line of the main power supply

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In the actual maintenance,

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if we determine that there is a leakage on the main power supply line,

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how should we repair it?

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Generally, this can be divided into two cases

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One is that the mainboard has water ingress corrosion,

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and the other is that there is no water ingress corrosion

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If there is water corrosion on the main power supply line,

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we need to find all the components to which the main power supply leads in the bitmap

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We focus on capacitors and chips

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We generally observe all capacitances on the line under the microscope

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If we see the capacitor corroded by water,

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we first remove it,

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and then supply power to the mainboard to see if there is no leakage

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If there is no more leakage at this time,

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which means that the leakage fault we mentioned disappears,

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it means that we have already repaired it

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If there is still leakage, what should we do?

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We will continue to look for capacitors and chips on the line to see if there is any corrosion

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If it is corroded, remove it,

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and power up the mainboard to see if there is any leakage

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If there is no more leakage, it means it has been repaired

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If it still has leakage,

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then we have to keep looking until there is no more leakage,

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and the repair is over

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If the capacitor is corroded by water,

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we don't need to repair it after removing it,

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just make sure that there are 3 capacitors on this line

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If the chip is corroded by water, we remove the chip,

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we have to deal with the chip first,

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and then install it

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If there is no more leakage, the fault will be fixed

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After we re-solder the chip, if the mainboard still leaks,

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then we need to replace the chip and solder it to the mainboard

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Ok, that's it for this lesson