Inner layer sequence [SOLVED]

[johu]

The last batch of SDU boards that I ordered was unusable because the 5V rail was shorted out. I couldn't find any other explanation then swapped inner layers. By design layer 2 is 5V, layer 3 is GND.

Now, after staring at the gerbers I'm starting to think it must be something else. Vias go all the way through and if a layer is etched away around the via it doesn't make contact, if it isn't etched, it does make contact. Shouldn't matter where the layer is in vertical order or am I missing something?

Here's the GND layer (layer 3) recognizable by the connection to the wifi modules thermal pad

And here the 5V layer NOT connected to the thermal pad

I have ordered a batch of 5 boards of that same design before and they worked normally.

[johu]

Yes, of course it was something else! The diode of the 5V buck converter was placed in wrong polarity. Spun it and board works

[johnspark]

awesome!