6s plus 110mA draw steady, not tristar nor tigris

Rodrigo, you kind of went about this in reverse order. By swapping so many IC’s in the hopes of fixing the phone quickly, you have created a lot of variables and applied a lot of heat to the board. Sometimes trying Tristar first is a quick and dirty approach but if it’s not solving a charging issue, you need to take a step back and try to understand what is going on.

PP_GPU only activates when the screen is turned on so it’s normal not to measure any voltages.

What was the original problem here: You started with Tristar yet you say it charged normally and you found a short in Chestnut…so what is the real issue here?

If the phone is dead, start probing the board first to get a better idea of what works and what doesn’t. Start with the main rails and then move onto the PMIC outputs, Chetsnut, BL, Mesa etc. If everything looks good on the “compute” side of the device, then check the BB_PMU outputs as Baseband issues will also cause boot issues.

When looking at a device where the history is unknown, do a thorough visual inspection to see if there are any leads. Any board with prior work will probably tough to repair as it will be difficult to know what was done and if it was done properly.