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    93.Cover welding
    In the video, we will learn to cover welding.
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    1

    00:00:05,300 --> 00:00:11,300

    When welding the upper layer, apply the solder oil at the position of the honeycomb hole in the middle layer

    2

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    There is no pad in the middle area, so it does not need to be applied

    3

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    You just apply it on each of the pads

    4

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    There is also a pin 1 mark on the upper layer

    5

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    Both front and back

    6

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    On the reverse side, the mark is at this position

    7

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    A small golden triangle

    8

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    The front also has a small dot on this corner

    9

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    Still corresponds to the position of the flash

    10

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    After that's right, we clamp the upper and lower layers on both sides

    11

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    To align with tweezers

    12

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    Almost there

    13

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    Loosen the tweezers slowly

    14

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    Heat again

    15

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    Take a flashlight to observe the seam of the fit

    16

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    Rotary-air hot gun for 280-300 degrees

    17

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    Air volume level 3-4

    18

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    There was a slight movement of the cover

    19

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    Now it's moving again

    20

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    It's welded

    21

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    After this,blow it for 5 to 10 seconds more

    22

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    Let's wait for it to cool down a bit

    23

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    Then look at the gaps on the sides

    24

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    This position

    25

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    Adhesion can be clearly seen in each pad

    26

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    There is also a slight gap on both sides of the top

    27

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    Feels a little tight in the middle

    28

    00:02:08,033 --> 00:02:11,133

    Because all CPU chips are relatively large in size

    29

    00:02:11,666 --> 00:02:15,033

    After disassembly, it will be more or less deformed

    30

    00:02:16,700 --> 00:02:18,966

    The middle position will be slightly arched

    31

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    As a result, it looks a little tighter in the middle and a little looser on both sides

    32

    00:02:25,833 --> 00:02:26,833

    This is normal

    33

    00:02:31,033 --> 00:02:34,066

    The A8 CPU has already been demonstrated

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