Electronics > Beginners
Addressable LED hell
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cbowen:
Thanks everyone. There's a lot of good takeaways from this thread.

 - The multi-pad SMD video makes it look pretty easy. I'll try the paste syringe setup and try again.
 - I'll only handle with tweezers and not touch them.
 - I love the term "carrier board". It makes it sound so professional instead of a copout because you're not capable.

It's going to take a few days for the paste to arrive. Thanks again everyone.
cbowen:
Oh, one other thing. This package makes it seem like the end of the world if I don't mount these within 12 hours of opening the package. Will I have to prep these again after the paste arrives?
thinkfat:
Did you try leaded or lead-free solder? If these are really so critical to the temperature profile, maybe you'll have to get a low-melting-point alloy with a high amount of bismuth?
cbowen:
So the paste arrived today. Super easy process, same result. So on every board, the first LED has worked, and second has intermittent non-existent functionality. Taking data off the distribution block and touching any of the LED's except the first results in small, dim flashes every now and then. Every connection tests out on voltage and continuity. So with all that consistency, I think this could be a power screwup.

In efforts to keep this a 2-layer board, I brought power from the terminal block down with almost each LED getting it's own trace. Ground however, took it's main trace to the last LED and daisy chains back to the first LED. I'm just going to go ahead and guess this is some catastrophically terrible practice. Please don't make me post a picture of the PCB screenshot, it will be so embarrassing..
Raj:
Never had a problem like this, unless I ain't using variable power (like an inlne fan regulator)/ temperature regulated iron.
Ensure that your tip is grounded.
Have thick traces, so they wick away the heat as fast as possible.
Don't use lead free solder...they need higher temps...use leaded ones.
use lots of flux
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