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Nasty Schematic vs PCB bug in revC1 - 1.2V and 3.3V regulators are swapped #170

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TomKeddie opened this issue Oct 29, 2019 · 6 comments
Closed

Nasty Schematic vs PCB bug in revC1 - 1.2V and 3.3V regulators are swapped #170

TomKeddie opened this issue Oct 29, 2019 · 6 comments

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@TomKeddie
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TomKeddie commented Oct 29, 2019 •
edited

I really want this to be some kind of mistake I've made but I'm fairly sure the pcb does not match the schematic. I believe the part numbers for U8 and U36 are swapped in the PCB file, the 1.2V regulator (TLV73312PQDRVRQ1) is shown as U8 driving the 3.3V bus.

This also affects the bom generated by the interactive bom generator. I'm hoping my board is ok but once I saw the 1.2V rail rise to 1.4V and shutdown I had a sinking feeling.

You can also see this in the text of the kicad files (thank you kicad for using plain text). The schematic does not match the pcb (github won't view the file).

image
@marcan
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marcan commented Oct 29, 2019

Ugh. Yeah, we found this, and fixed it, but evidently I forgot about regenerating the fabrication outputs (and updating the PCB) with the fixed schematic data.

I'll do that as soon as I get home. Sorry that you had to stumble upon this the hard way.

@TomKeddie
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TomKeddie commented Oct 29, 2019 •
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Thanks I figured someone must have seen this I guess I should have been working off the branch not master. Seems like that's the only PR that needs merging to master.

@marcan
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marcan commented Oct 29, 2019

Those commits should be in master too, unless I did something horribly wrong. What I just didn't do yet is propagate the change to the other files.

@TomKeddie
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TomKeddie commented Oct 29, 2019 •
edited

I test generated a PR from revC1 to master, the schematic file changes were the only ones that came up not merged. (edit schematic not pcb, so yes pcb needs to be updated)

@TomKeddie
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TomKeddie commented Oct 29, 2019 •
edited

I should add that I have absolutely no ill feelings about this. I'm in the wild west of hardware and here be dragons. I built two boards knowing that the process might not be smooth, I now need to find the shorts on my other board.

@marcan
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marcan commented Oct 30, 2019

Should be fixed in dc3e083 (branch) and b436530 (master). Sorry again for leaving this pending so long :(

@marcan marcan closed this as completed Oct 30, 2019
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@marcan @TomKeddie