Love the idea, but alas people don’t seem to be too interested in the electrical engineering side of the phone. I tried to find people who were interested in the schematics when they were published, but almost nobody wanted to talk about them in the forums.
I’d have loved to tinker around with the librem 5 hardware and could barely wait, but in the end I canceled my order (and dont regret it), so I will never be able to play around.
But if anyone wants to investigate on his or her device I’d love to help. You’d need at least one good quality multimeter (better two or more) and likely some decent soldering equipment along with the confidence to solder small, bipolar SMD-parts.
We’d best try and work out a nice script that puts the phone through some sort of standard usage (thank god it’s Linux! :)), while we meassure the power-consumption on all the power-rails one after the other. That can give us a hint which parts waste the most energy and wether its a hardware issue. It might be also a good idea to analyse the various dc-dc-converters and figure out if any of them is oscillating at any load-scenario. That’s where an oscilloscope is necessary.
In order to investigate the circuitry’s behaviour under various supply voltages I’d run the phone without a battery but supplied from a stable lab-supply at interesting, stable voltages.
On the schematic side it might pay to search for the drop-out-voltages of the various converters. Perhaps one of them has a too small drop-out-voltage, which would explain a lot. I had a quick glance at this when the schematics came out and I didn’t find any on the spot, though. I also checked some of the part’s quiescent currents in the vain hope to find any significant leakage.
If anyone is up for investigating I’d really love to help, but really I doubt that there is anybody out there, as I assume that very few people who have the requisite equipment have backed this project to the very end, due to purisms dismal performance on publishing usable, professional information on the electrical engineering side that instilled even a bit of hope.
Yet, if there really are people who lack the equipment but have a strong interest and a phone and are close to western bavaria we might be able to spend a couple of evenings investigating with my equipment.