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Hello everyone, in this lesson we will talk about the soldering of EC chips

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Let's talk about the disassembly of the EC chip first.

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Before disassembling the EC, we need to apply a proper amount of flux to the pins of the EC

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After adding the flux, we need to use the air gun to heat the EC

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Here we need to pay attention to only heating the four side pins of the EC, not the EC itself

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The EC body is relatively fragile

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If heated for a long time, it may cause damage to EC

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We first use an air gun to blow and melt the applied flux

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After blowing and melting, use the corner of the tweezers to hold the corner of the EC

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Be careful not to pick up the tweezers, but to stuff them under the EC.

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If the tweezers are picked up all the time, it may cause the pins of the EC to be deformed or even the pads to fall off.

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We use an air gun with a temperature of 400 degrees and a wind speed of 60 to evenly heat the four sides of the EC

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When the pins on the four sides start to melt, the tweezers will continue to penetrate the bottom of the EC

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When the pins on all four sides are melted, we can use tweezers to remove the EC

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After removing the EC, we first need to clean the pads

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It can be seen that the current pad is uneven

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We use soldering iron and tin wire to drag solder the pad

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Note that the direction of drag welding must be along the pad

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If you don't follow the pad, it may drag the pad off

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After the EC pad falls off, it is very difficult to repair the pad

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After the pad is flattened, clean the pad

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After cleaning up, the processing of the pad is over

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Let's deal with the removed EC next.

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It can be seen that there are some glitches on the pins of this EC

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We need to drag these glitches out of it

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Of course, if you are using a new EC, you can skip this step directly

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We apply flux to the four pins of the EC

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Then use the knife side of the soldering iron to stick the residual tin on the pins

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When doing this step, be careful not to overdo it.

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If it is too heavy, it may bend the pins of the EC

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After cleaning the pins of the EC, the EC has completed the processing and entered the state of being soldered

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Next, let's look at the solder of EC

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You can see that there is a point on this position of the motherboard, which represents the first pin of the EC

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It can be seen that there is also a dot on the chip, which represents the first pin of the EC chip

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When soldering, be sure to match them up, otherwise the chip will be soldered upside down

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Next we need to align the EC

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The alignment of the EC must be very precise

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Even if the alignment is a little bit off, the subsequent drag welding will become very difficult

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After the position is correct, we first press and hold EC

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Use a soldering iron to add tin to some of the pins of the EC to fix the EC

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After the EC is fixed, you can let go

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Next we use a soldering iron to fill the sides with tin

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After filling up the tin, we are about to start drag soldering

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First rub the tip of the soldering iron back and forth on the pin

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This way the pins are not easy to solder

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You need to pay attention when rubbing, it must not be too big, otherwise it is easy to bend the pins

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Next we zigzag the pins with a soldering iron

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This can quickly bring the tin down

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Then we keep repeating the actions of dipping tin and wiping tin until all the tin on the pins is taken off

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At the end of soldering, there will always be a little solder that cannot be dragged down

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At this time, we can add some flux, and then tap it with the tip of the soldering iron, and it will come down

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This side has been mopped clean

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Then we drag the other 4 sides in turn.

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After cleaning, we need to check the EC to see if there is any empty soldering and linked soldering

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Linked soldering is easy to check, you can tell at a glance

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For empty soldering, we need to use tweezers to scrape

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Let's scrape next

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It can be seen that each pin is very firm

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Then the soldering of the EC is complete.