[weblacky]

Did you measure the actual voltage it complains about?
[...]

In this case the answer is, no...I did not actually measure them...but that's because the DS1780 onboard the PIMM is what is reporting that for me

I have a O3K PIMM module where the DS1780 reports 3.2V while measuring showed 3.3V. Temperature is also off, which makes sense as everything is measured by the same ADC.

From where did you measure the 3.3v, exactly?  My base point being that it's local voltage...not PSU voltage.  Similar to how your car's battery may be at say 12.4v at the terminals but your cig lighter voltage is more like 12.3v at no load.

If you used the PCB test point just to the edge of the PIMM DS1790 3.3v sensor pin and got a higher voltage, then I'd say you have something.  If you measured at the PSU, then you're not accounting for voltage drop (due to incorrect placement of the test probe), and the PIMM is very likely correct.

Also given that the the DS1780 had assigned pins for each major voltage (by the datasheet) I've not heard of a single voltage sensor among all the sensors in a DS1780 IC failing that way (I assumed the voltage sensors shared a functional block and just used various different resistances for proper limiting internally, so they all go odd if it's damaged).

At least on Fuel, the PIMM DS1780 monitors : PIMM0 12v Bias, PIMM0 1.5v, PIMM0 3.3v Aux & PIMM0 5v Aux....perhaps even Fuel CPU...but I don't know that for certain.

However, until ALL values are within ENV stable, I won't be able to query it to validate that with the PIMM under repair.

My point being, at this time, for this size of traces, unless I wanted to contaminate the a test point with solder, permanently, to temporarily solder a test wire to measure from, I'm not going to chance a hand-probe measurement during power-on for the CPU...not happening.  A single slip of the probe and I bridge two things that then destroy all my work.

I normally NEVER do power-on testing accept with higher-level items that given me the room for it.  Since we have this wonderful env system...I'm using it.  And to be fair even if each DS1780 has a tolerance of say +-0.2 voltages...that's fine...I'm talking about a short that loses me nearly 3 volt,s now!  So I'm look at a real issue, not a "false" sensor glitch.

Even in a car I'd trust the sensor and check the part before I immediately claimed the sensor was bad...because odds are...the sensor is right :-)