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Let's find a bad motherboard to remove some empty dots

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The chip that was removed just now has a lot of empty dots on it, which can also be used

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This very round shape on the chip looks like a yellow dot

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It's actually silvery white on the front

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Use a straight air gun to remove this copper piece

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As for this chip, we're going to clip it

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It's very light

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It'll move once we blow it

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We have pikced up a dot

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Then we put the dot on the solder joint that has been dropped

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The back of the dot you just saw is red

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The front is silvery white

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We put the front silver side down

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Red side up

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Put it on the solder joint like this

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Add a little flux

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Straight-air hot gun

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450 degrees still

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Melt this dot

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So this point has been filled

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If you can't find dots, you can also buy them

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Like this

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There are a lot of regular small dots on a transparent plastic film

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Seemingly this point will be slightly larger to this motherboard

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If you want to fix some other situations such as mid-layer drop points, you can use this

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We can try one

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It looks a bit big

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It's big indeed

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It's best to remove it from the discarded motherboard

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Or remove it from the disassembled chip

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Remove another one from this chip

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A little more soldering oil

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We cannot use a soldering iron for this step

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The soldering iron may stick it away