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I wanted to do a project using these ws2812b leds, and I find them nearly impossible to hand-solder them because of the tiny contact points. Can someone teach me how to solder these by hand? They are surface mount components as you can see in the images. enter image description here enter image description here

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  • \$\begingroup\$ It'll take some practice, but what I would do is put down a little bit of solder on the PCB at pin 2 or 4 (assuming potential for ground or power pours requiring more heat). Then, place the component on top and heat up the bit of solder and the pin simultaneously for about 10s, while lightly pressing on the LED. once the first pin is secured go around and do the rest. Alternatively, use a bit of kapton tape and tape it down then go around pin by pin. The key is heating both the pad and the pin so that solder wicks up onto the pin to make the connection \$\endgroup\$ – ks0ze Feb 22 at 15:09
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I assume you don't have an SMT rework station :)

Put some solder paste on each pad. Place the part on the board. Use a toothpick or something similar to hold it in place, and use your iron to melt the soldering paste on each pad individually. I would guess about two cubic millimeters. If you are not happy with the result, you can touch up each pad individually. Use plenty of flux for the touch-up.

Practice on a scratch board with a dead part first, as it's easy to mess it up if you haven't done it before (but then again, how would I know :) )

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  • \$\begingroup\$ Sounds like a good idea, thank you! \$\endgroup\$ – Jc S Feb 23 at 1:35

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