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Today I'm gonna introduce a solder fixture used in the repair of mobile phone motherboards

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Let's take a look at its structure

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The common solder fixtures in the market are mostly made of metal and synthetic stone materials

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Synthetic stone is the black color we see on the surface, the red color, the blue color, and the gray color

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It's very heat-resistant

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It looks like plastic

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But it can withstand the high temperature of four or five hundred degrees

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No deformation, no melting

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Now,let's learn how to use it

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Let's look at this one on the lower right

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It's for all models from iPhone 6 to iPhone XR

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The advantage of this one is that it hollows out the back of the welding area

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The area where the motherboard of the mobile phone is soldered has components

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The back area also has components

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If you directly throw the motherboard onto the desktop for soldering

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The tin will be melted in the area where is blown

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It is also possible for the tin on the back to melt

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During the soldering process, use tweezers to clamp the chip and components, and push the motherboard slightly

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It is possible that the components on its back may be short-circuited

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Or the components are distorted and displaced

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This fixture hollows out the middle area

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This way the back side won't be touched

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Let's see how to fix this motherboard to this clamp

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Let's fix the reverse side to the fixture first

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Use the metal post in the upper left corner to hook into a screw hole on the motherboard

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Bottom stretch back and forth

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hold the motherboard

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In this way, the motherboard will be placed on the fixture stably

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When soldering with tweezers or when prying the chip with a blade

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This motherboard is very light, and it may move with a slight pick

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In order to prevent the motherboard from moving, you can use the buckle around the motherboard to press the motherboard

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In this way, when you pick the motherboard, the metal at the bottom acts as a counterweight

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The whole board will be firm

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The front is fixed to the left

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Let's take a look at the front fixing method

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Use the screw post in the upper right corner to poke into the screw hole of the motherboard

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Compress around the buckles

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This board is fixed

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All motherboards in the 6-XR series are the same way

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Hang this and this two metal buckles first

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After hanging up

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Then put the motherboard straight down

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don't slant

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Hold the motherboard with the bottom support bracket

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The three buckles on the top are pressed against the motherboard

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Now you can weld

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There are some other functions on the fixture

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Like this area

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The surrounding may not be very clear

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Look closely and you'll see 8 9 10 11 12 13

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Corresponding to A8 A9 A10 A11 all the way to A13 CPU

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It is the CPU chip used in the iPhone series

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From the A8 of the iPhone 6 to the A12 of the iPhone XR, we can put the CPU in this position

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This is a CPU chip

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This is an A8 CPU

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One of the corners is facing 8

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The other corner faces this one below

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This chip is a bit dirty

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Not very flat

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Now we can take the soldering iron and desolder the tin on the chip

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Scrape the glue on the chip

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This is a way to fix the chip

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The other side

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The chip on the motherboard is not just the CPU

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There are other chips of various sizes

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can be placed in this area for fixing

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After the chip is stable, push the slider up

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The chip is fixed

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No matter big chip or small chip

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The small chip needs to be pushed a little bit more from the inside

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If the chip is big, it can be removed a little from the back

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This slot is bidirectional

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The other side can also be fixed

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so that it can be clamped

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This is how the iPhone 6-XR series fixture work