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In this lesson,

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we talk about how to maintain the power connection protection

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Then there is another maintenance method

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For the failure of water ingress,

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it can also be repaired by a maintenance method with no abnormal appearance

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In the actual maintenance,

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we will find that the mainboard is very beautiful,

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there is no heavy fall or deformation,

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no components on the mainboard have been touched,

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and there is no water corrosion

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This is an unrepaired machine

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So, how do we repair the power connection protection of this mainboard?

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Here is a general description for you

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Adjust the power supply voltage to about 4 V,

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supply power to the main power supply line,

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and then apply rosin on the chips or components connected to the main power supply

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Because the power supply line is short-circuited,

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after we supply power to it,

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the damaged components on the line will heat up and melt the rosin,

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and we can find the fault point

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Next, I will show you

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This is the DC power supply,

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we set the voltage to around 4 V,

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then plug the power cord into the DC power supply,

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There is an alligator clip on the power cord,

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the red one is connected to the positive pole,

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and the output is about 4 V

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The black one is the negative pole,

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which can be clamped to the shield of the main board

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The shield on the main board is the negative pole of the power supply

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And where should we put the red clip?

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We soldered a wire to the main power supply line

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and then clamp the other end of the wire with the red clip

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The first step is to smoke the rosin,

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to these chips and capacitors on the main power supply line

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The second step is to use the 4 V output by the DC power supply

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to burn the machine

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Then the way to burn the machine is what I just said

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The black clip is clamped to the ground wire of the mainboard,

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that is, the negative pole

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Use the red clip to clamp the other end of this wire to see where the heat is

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After heating, the rosin will melt

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According to the melt position to determine

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whether the chip or the capacitor is damaged,

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just remove it directly

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This is our repair method

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Okay, that's it for this lesson