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After the dissassembly, let's look at the pads

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Check if there are some pads are off

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Especially those pins on the edge

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Pay attention to these pads where the surface is relatively flat

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to see if there is any pads break-off

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If the pads break off, there will be a layer of bright yellow on the surface

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It is the pin ripped from the CPU

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The surface we see now is silvery white,

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it doesn't matter

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Although some individual pads did not melt

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But this is tin, it didn't stick the pads off

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We focus on the upper and lower sides

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The tin on the top side is all melted so it couldn't fall off a bit

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There is a pad break-off, in the middle area

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This is basically because the CPU has been dropped before

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Pad break-off is generally because you go to pry the CPU while the tin has not melted

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As can be clearly seen in this area, the solder has completely melted

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And this solder, it is not particularly flat,

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The tin in this area has also melted

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it is a little convex

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This kind of pad is a little loose before we disassemble the CPU

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This area of the corresponding CPU can also be seen,

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there are several pads break-off

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You can't see clearly because it was stabbed by a knife

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There are 3 pads break-off here and 2 here

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So there are total 5 pads break-off

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In this area, pad break-off will continue when we go to scrape

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Because this area fell before it was disassembled

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Or there is some kind of pulling force on the board that pulls the pad away

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In this case, we need to apply the green oil before scraping the glue,

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Prevent the tin from getting on when scrapin

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Let's clean it first before we apply the green oil

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I washed it a little, and the other pads broke off

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Now there are total 8 pads break-off

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So this pappened because it had a heavy fall, pads would easily break off when we touch it

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as for this kind of CPU, when we need to move board, most of them are to be polished

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Turn the pcb over, punch it through, and hit the areas where solders are

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After that, just bring it over, and clean up the glue on the side a little.

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Directly reball, and then install it on the motherboard

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As you can see, there are some pads break-off here

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But some pads wouldn't break off when they are just a little loose

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There is some glue on this side, if we pry it directly,

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it will easily break off

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This is the case for all CPUs after A10

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These pads are particularly fragile

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As long as the blowing temperature is enough, if the pads break-off still happen

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it has nothing to do with our technique

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Whether the temperature is enough mainly depends on the pads

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If the pads are flat

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like these, or these

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This kind is relatively flat, and pad break-off next to it or itself.

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That is because the temperature of our disassembly is not enough

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But like this area, obviously the pad around him has melted

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If the pads break off again, it's not because of the temperature.

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Now let's use the curing light to cure it after we finish the green oil

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Now, the CPU pad break-off preprocessing is finished