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86.Cleaning the flatten back pads
In the video, we will learn to cleaning the flatten back pads.
Detail
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Find a clean dust-free cloth and wrap the chip inside the cloth

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Wait for it to cool completely before cleaning

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Because the chip is still relatively hot, if you suddenly wash it with PCB cleaner

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Cooling down too fast may cause the chip crystal to break

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We'll wait for it to cool completely before cleaning

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Cover the surface with a cloth and brush

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Use the dust-free cloth to stick out the dirt in this hole

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Check again to see if there is any dirt in the hole

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If there is dirt, we will use a sharp blade to pick it up again

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There is a hole in this area with a black glue block in it

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Pick out with the blade

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There are some bits of solder slag on the side

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It doesn't have much impact

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Because we'll be reballing later

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Mainly to see if there is glue in the hole

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After cleaning, we flatten the solder on the back

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This step must be before the middle layer of reballing

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When flattening the solder, pay attention to do it on this silicone pad

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The silicone pad can give it a heat dissipation effect

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Next we clean the chip again

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Almost cleaned up

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