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Now let's learn how to solder components back

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We need to find a disassembly board of the same model

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The disassembly location must not be wrong

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This row of the same color and the same size are resistors

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But the resistance value may be different

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The character of the components may change if they are disassembled in the wrong place

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So when we replace the components

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It must be replaced in the original position from the disassembly board

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Don't randomly find one that looks the same and replace it directly

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It's easy to go wrong

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And it will cause the circuit to not work properly

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We have found a motherboard of the same model

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The same position

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Next we start to dismantle

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When disassembling this component, the method is slightly different from the previous one

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First apply flux on the surface of the component to be disassembled

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Straight-air hot gun still

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The temperature is still 450 degrees and the maximum air volume

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Blow this soldering oil onto the component first

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Then heat this component

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Take tweezers and touch the surrounding

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Because we don't need the dismantling board anymore

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We can loosen the surrounding first

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When the solder of this component melts

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Grab it with tweezers

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Don't break it as hard as before

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After the components are removed, we solder back the motherboard that needs to be repaired

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Components are placed where they need to be soldered

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Then add a little bit of flux

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The flux is to help us solder

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It can also wrap the components

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In this way, when the air gun is blowing, it will not be blown away by the large amount of wind

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Flux can be added a little more

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The temperature of soldering back is still the maximum wind of 450 degrees

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Still straight-air hot gun

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Clipped on both sides of the component

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Place it where we need to solder

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Blow for two or three seconds, then remove it

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Release the tweezers

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Touch the component lightly with tweezers

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Touch it lightly and see if it moves

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It's not moving now

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Blow it directly

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Blow to its homing

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Welding of this component is done

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We can clean this area

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When the actual maintenance, be sure to wait for the motherboard to cool down before cleaning

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Put a dust-free cloth on the surface of the motherboard

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Then the brush is dipped in the PCB cleaner and brush it with the cloth on

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This area has been cleaned

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The solder joints on both sides of the components soldered back are fuller than those from the factory

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This will make sure it's 100% solidified

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No open soldering due to less solder

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This is a process of component replacement