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After the chip is reballed

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Next we can solder the chip to the motherboard

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Before welding,we gotta clean the motherboard

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To clean off the dirt

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There are also some solder beads of different sizes on the pads

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Let's flatten them with the desolder wick

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Must be gentle to do it

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The soldering iron only needs to be placed on the copper wire

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Do not press on it

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During the flattening process, a lot of idle pads will be removed by the desoldering wick

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This is normal

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Don't mind it

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Put a dust-free cloth on it to absorb the welding oil

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By doing so,the motherboard will be clean

15

00:01:16,733 --> 00:01:22,166

If the idle pad sticks to the pad, scrape it off with a blade and an air gun

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Straight-air hot gun

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The temperature doesn't matter

18

00:01:27,866 --> 00:01:30,300

Just blow the solder and pick it off

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The glue next to the flash chip is still there

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00:01:40,000 --> 00:01:41,966

Brush sideways with a brush

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Now it's clean

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Put some flux

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When adding the flux, we also need a hot air gun to heat the board

24

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So the flux would be more even

25

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Thickness is easier to control

26

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If you apply flux directly on the cold board, there will be a thick layer

27

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When applying this large chip, you can bend the needle of the syringe a little bit

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There must be a certain curvature so that it is easier to apply

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Wipe the excess to the edge

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Don't be too thick

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Pay attention to the idle pads

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If there is,remove it