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Then we start to disassemble the chip

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The first step

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We need to cut the glue in the gap between the chip and the components on the edge

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For this step,we use a hot air gun

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Both rotary and straight air guns can be used

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Adjust the temperature to about 200 degrees

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Adjust the air volume to the maximum

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Soften the edge glue by blowing

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Then cut it off with a knife

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While cutting the glue, the blade should touch the chip tightly

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Stand up and touch the chip

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Then pull back and forth like this

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The position where the glue is thick should be gently cut from the surface little by little

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This step is best done under a microscope

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Because some chips have very small components on the edge

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For example,such small resistors and capacitors we see now

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If you scrape without a microscope, you may scrape them loose

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We cut the thick part downward from the surface little by little

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Don't rush

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When cutting the glue, the blade should not be inclined to the outside

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Don't lean in this direction

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Or this direction

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The handle should be parallel to the chip

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Don't turn sideways like this

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Or to another direction

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It is easy to squeeze the surrounding components

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The temperature of 200 degrees will not melt the solder

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You can cut it with confidence

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It doesn't matter if you cut it for a while

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In addition, we must pay attention to the position where our knife passes during the process of scraping the edge glue

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Use a microscope to see if there will be copper exposed in the gap after scraping the glue

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When the edge is scratched too hard, the copper will be exposed underneath

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I scratched it to an exposure on purpose to take a look

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This area has obviously exposed the color of copper

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The board has been scratched badly

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If you scratch a little harder, some lines may be broken

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We must pay close attention to the position where the blade passes when we scrape

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If there is exposed copper in any position, the force of hand pressing the blade must be lighter

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Now all the glue on the edge of the chip has been scraped off

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Next we can disassemble the chip