Black screen after closing switch with HwFly RP2040

[minimanimo]

@Severence

Yeah. What might be worthwhile doing is, checking to see which area / side represents the lowest, what I mean is, maintain a consistent ground throughout (ground pad at the USB for example, and I mean pad here, not the USB steel) and with your other probe measure the inductor in question back near the main PMIC, note the reading to the last decimal, maintain your ground and then take your red probe and measure any of those caps you determined are on this same rail and then note the reading. If it was lowest at the caps on the SoC wafer then most likely the SoC is responsible (your then welcome to try pulling those caps off as a last ditch hope ) if the reading is lower at the inductor, then the problem is most likely the PMIC.

Worth noting though, there may be one other location worth checking the above too, the caps running down the side of the Ram IC’s, one of them may be on this rail too. If you identify any, you can do the same thing as above, if it’s lowest there, then you know it’s most likely Ram at fault

Hi @Severence,
I am going to try and check these.

I think is a ram fault: I forgot to mention, but when the modchip was booting (post #68) I’ve tried to run multiple payloads. As suggested, I’ve tried to run usm-loader and is the only payload able too boot and get something on screen. This usm-loader is a piece of code that uses IRam (integrated in the Tegra?). So, if is the only payload to load, then is possible to assume there is an issue with the Ram.
I think our measurements also confirm this. I’ll look for some shorts, but I’m not exactly sure where to look.
Do you think a problem with the ram can be solved?

@Severence

Also @minimanimo after you’ve checked those measurments mentioned previous. Can you let me know about the SoC die in your pics, is it just a trick of the light (?) or is there solder on the die, or has liquid metal been used? or is this just some shiny thermal paste? Just asking because it looks odd, but like I say, could just be a trick of the light

I think, and hope, it is only the effect of direct light. I took the photos shortly after removing the modchip and cleaning everything with alcohol, so I think this is it

With less light: