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105. Reballing Pretreatment
In the video, we will learn to reballing Pretreatment.
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For this kind of CPU after a 10, when we directly disassemble

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and install it, there is no need to delaminate

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Because its middle layer is sealed with the kind of sealant

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when the chip leaves the factory,

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and it is resistant to high temperature.

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The tin inside won't extrude when heated, so we don't have to layer

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The sealant in the chip of A8 & A9 is sealed after leaving the factory

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The tin inside will extrude when heated

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After cleaning, we can start to reball

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We still reball by using the reballing platform

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Like this CPU

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There may be some residue around it

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that is not completely scraped

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For example, in the lower right corner

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We need to scrape it off with a blade firstly

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Otherwise, it won't fit into the slot of the fixture

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Now, let's scrape it off with a blade

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After clean it, We start to place the CPU

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For A10, put one foot to 0, and the other foot to another 0

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If so, it is inside

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There is still a little glue on this corner, scrape it off first

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After placing the CPU, let's place the stencil

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There are two kinds of stencils for A10 CPU

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This is the first one, you can see there are some perforations

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which corresponds to these small components below.

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Like these positions, we need to apply green oil to the bottom pads,

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prevent them from having larger solder points on them after reballing

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Now let's start to put the green oil

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There are some stencils that correspond to the positions

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of the components on the CPU are blocked

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For example, let's take a random stencil and take a look

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Like this CPU, these positions are blocked

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It has grooves on the back to cover the raised components on the chip

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But the stencil we just saw did not block these places

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Then we need to paint this position with green oil

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Try not to apply this green oil to the outside,

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otherwise it will hit the stencil

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Let's cure it with a curing light

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The chip is still slightly slanted

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Almost done

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It's okay to be a little slanted

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