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After the components are removed

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We rarely measure whether it's good or bad because of the small size

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If you use a multimeter to measure these two solder joints

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Maybe two test leads touch this component, it will shift

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Or when the force is too strong, it may be crushed

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So basically you can see its original value from the drawing

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For example, what I am disassembling is a resistor

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I can see the resistance of this resistor from the drawing

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According to the resistance value on the drawing, the corresponding components can be found or the motherboard of the same model can be found

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We can take a motherboard of the same model and replace this component from the same location

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This saves a process of checking drawings

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But the motherboard we dismantled must not have entered the water

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And there is no high voltage electric shock

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This ensures that the component is good

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This is one way to replace components

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Next, let's see how to put the component I disassembled back on

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We will discard this component that was disassembled.

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Then we're ready to solder a new component back

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The solder joints of the disassembled component need to be added some solder

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When dismantling just now, we avoided touching the peripheral components crooked

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At this time, there is basically no solder on the solder joints of the disassembled components

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We must add solder on it when we weld it back

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The solder joints should be added to the size of the solder joints of the motherboard when they leave the factory

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For adding solder, we use medium melt solder of 183 degrees

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Use tweezers to get a little bit solder out of the solder bottle

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Then add on the corresponding solder joints

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Then use tweezers to distribute it to both sides

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The size of the solder joint solder should be uniform on both sides

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After the solder is applied, we use a straight air gun with a maximum air volume of 450 degrees to blow the solder

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During the process of blowing solder, you can use tweezers to gently push the solder powder in the solder

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Make it easy to stick to the solder joints

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After the solder paste is soldered to the solder joint, we can scrape off the excess around it with tweezers

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Prevents short circuits in the perimeter

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Both sides of the solder should be uniform, and the solder joints should be full

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Don't make one side big,the other side no solder

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This will make it very difficult for you to solder components

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And the solder joint with less solder may cause the soldering to fail

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This is the process of adding solder