<d1b2>
<Perigoso> I assembled it yesterday, but it has a short on 3v3 and I can't for the life of me find where
<agg>
ugh, that sucks.. is it a dead short? do you have a current limited supply?
<agg>
if you can run a little current into it and have an ir thermometer, or your finger, or ideally an ir camera, you can sometimes locate it thermally
<d1b2>
<Perigoso> I have a current limited supply, I tried to do that through the 5v but the only thing that heated up was the supply, to be expected
<d1b2>
<Perigoso> I was afraid to feed 3v3 directly
<d1b2>
<Perigoso> How much current do you think is enough?
<agg>
i would usually start at like 50mA and if I can't detect anything, work my way up, but I've never tried that on a glasgow and don't know if there's anything on the 3v3 rail that might not like it
<agg>
(also i have an ir camera so can quite quickly detect fairly small/localised temperature variation, it's harder with a thermometer)
<d1b2>
<david.lenfesty> your finger'll find a hotspot pretty quick 😄
<d1b2>
<Perigoso> Thermal camera has been on the wishlist for a while 😅
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<d1b2>
<Perigoso> welp
<d1b2>
<Perigoso> its a dead short
<d1b2>
<Perigoso> and nothing is heating up
<d1b2>
<Perigoso> weird
<agg>
if it's e.g. a copper short on the PCB, there won't be much of a localised hotspot
<agg>
but you still might be able to trace the path the current is taking until you find it
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<d1b2>
<Perigoso> I really hope It's not a defective board, that'd be really annoying
<d1b2>
<Perigoso> but it feels like it
<agg>
it's pretty rare
<agg>
crank up the current a bit, see if you can work out where the power's going :p
<d1b2>
<Perigoso> has happened to me once before
<d1b2>
<Perigoso> its a 2.5W
<d1b2>
<Perigoso> just slightly warm
<agg>
2.5W should be making something pretty warm somewhere, assuming it's not like the whole 3v3 plane shorted to gnd or something
<d1b2>
<Perigoso> quite a bit must be lost at the cables, but still
<d1b2>
<Perigoso> it's warming up around the level shifters
<d1b2>
<Perigoso> not a lot though
<d1b2>
<Perigoso> maybe i have them all flipped or smth?
<d1b2>
<Perigoso> Sorry I couldn't get a capture from the scope so this will have to do
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<d1b2>
<NF6X> Those look like not-great footprints from the default KiCad library to me. I've had assembly stall before because the assembly house wasn't clear about the pin 1 markings for SOICs on the PCB. Since then, I always examine, and usually modify, default KiCad library footprints before they go into my personal curated libraries at home or work.
<d1b2>
<NF6X> Those parts look correctly oriented to me.
<d1b2>
<konsgn> sometimes you can narrow down the location of a short with a multimeter that can display sub ohm readings in continuity mode.
<d1b2>
<konsgn> probe to gnd, and poke around on the 3v3 rail see where the least resistance is can help localize your searching.
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