Years ago I had a "ReworkCTF" board with 20-odd PCB layout bugs designed into it on purpose, ranging from backwards LEDs to missing vias under a BGA to inner layer differential pair swaps.

[azonenberg@ioc.exchange]

@jpm @ThermiteBeGiants Oh the swapped diffpair is gonna be 0.125mm which is min feature size for oshpark. Not much of a challenge if it's big

[roukemap@social.treehouse.systems]

@azonenberg
Tied an (unused) FPGA bank VCCO to ground and it really wanted go to a power on this device. 0.8mm bga two vcco pins per bank. Found an alternative workaround with no mods in real life, but I think I was showing our techs on of your blog posts at one point.

Two ldos, one got copied from the other in schematic, and the vset and ilim net labels didn't get renamed. Just needed some surface cuts to split the nets.

[tj@altelectron.org.uk]

@azonenberg @jpm I have this from Congress two years ago. I think there’s demand.

[azonenberg@ioc.exchange]

@tj @jpm yep i think that was... cpresser? who took my concept and ran with it to be a bit more newbie friendly and lower cost.

[tj@altelectron.org.uk]

@azonenberg @jpm yeah looks to be, more boards for challenges with documented test stages would be great.

The smd soldering kits from china are helpful for learning, but they don't have any mid steps. It either works or doesn't and that isn't the best for figuring out what you did wrong.

[aburka@hachyderm.io]

@azonenberg - IC footprint with the pins in reverse order on one side
- depending on which pins in a (molex, etc) connector make contact first, an alternate path to ground exists through data lines that can't handle it

[cccpresser@chaos.social]

@tj @jpm @azonenberg exactly. The main idea was to make a challenge board that is not super frustrating for beginners. And has lower requirements regarding tools and materials.
https://gitlab.aachen.ccc.de/cpresser/reworkctf-pico/-/blob/main/docs/Challenges.md?ref_type=heads

This was after I solved Andrews version and was not to happy with my own results

I am considering to make more of them (they are "sold out"), but have not yet decided if I want to add more challenges or edit challenges.

[azonenberg@ioc.exchange]

@cccpresser @tj @jpm well I'm planning to do a rev2 in the next month or so, then livestream a playthrough

[craigjb@fosstodon.org]

@azonenberg I thought I had more bodge pics, but here are a couple real ones

1st pic is wrong crystal footprint would be good. On this board I swapped the two gnd pads with the out and vcc pads. On a non-symmetric footprint too.

2nd pic is a bodged missing protection diode on a SOT transistor

[craigjb@fosstodon.org]

@azonenberg students can use my crystal bodge as an example of low quality rework

[cccpresser@chaos.social]

@azonenberg @tj @jpm in that case, I will wait to see your rev2 and copy the new challenges and ideas that fit the "accessible" format as well.

My rough goal is to have a new version of my variant available for emfcamp.

[0h00000000@ioc.exchange]

@craigjb @azonenberg