Lexel; Glad to read you may do this again. I’m in need of drivers to build triples for my 2 Jaxman E2L hosts. Have two 219b 4500K & several 219c 5000K LEDs from clemence that need homes. May try mixing tints.
I like ToyKeeper’s UI in the BLF A6 and now so much more has been developed by the amazing people on BLF. Will read up on all the options you have once another run is a go.
Thanks to all sharing their expertise on BLF, it is magic.
This is why I always ask anyone sending my a payment to include the following details in the notes. I have had too many cases where I just can’t figure out who is who and what is what with unlabeled payments.
so finally reflowed all those 200 AMCs and some MCU sides of 17/20/22mm
in the picture on the left side drivers that are ready to be programmed and tested,
already passed visual check, with some that needed some parts aligned right, remove solder blob shorts between pads
on the right side drivers with AMCs missing as I expect 100 from the last order I added after I got more MCUs and fets to build some extra drivers
I did learning by doing for reflowing drivers
I learned how to apply a tiny but sufficient amount of solder paste with some tricks
just see one of the first vs the last, optical far better, but electrical identical
At this rate you will surpass myself in the most TA drivers built lol.
The latest drivers do look much better, you don’t need much paste at all. This is why the stencils are so nice, they give you the perfect amount and put it in the perfect spot every time and in a a couple of seconds too boot!
A tip for better reflowing is to reflow the top side components first and heat the pcb from the bottom with about ~350-380c air. First off this lets you use much higher air speeds without blowing components off and it also ensures the best possible connection.
The 7135 side just do like normal from the top of the components. They are much easier to deal with like this.
Those shorts are almost always a result of too much solder paste. This is why I recommended the stincles. They make it much easier to get the right amount but not too much.
This is a case where less is more.
The mask looks good, the solder looks to have been pushed up from the FET having too much paste.
Generally if you replace the 7135 and reflow it back on it will work fine as that removed a little bit of solder paste when you do that.