Hmm if you still have a short there and more specifically the capacitor connected to pin/pad 6 (which is tied to 3V3PDR) even after removing the M9 IC then it’s unlikely to be the BQ IC responsible as from memory it’s not directly connected to this rail… though I’ll have to double check that.
Prime candidates now are the other IC’s which are directly connected to both 1V8PDR and 3V3PDR
Though I can’t rulle out the possibility of it being 2 seperate IC’s/faults IE: an IC that’s only directly connected 1V8PDR with a fault condition and then again on a completely seperate IC which only has a direct connection to 3V3PDR and again with another fault condition… but the chances of this are extremely low, just not impossible. (i hope that makes sense, i know it’s quite confusing)
Same goes for if a cap has failed, but again, the chances of two caps failing on two seperate rails at the same time is very rare.
Unfortunately, the remaining IC’s which are connected to both of these rails “at once” are now all the difficult ones that are not easy to remove/replace… If you were troubleshooting a regular switch, I’d advize disconnecting the EMMC module, unfortunately you don’t have that luxury on Lites, so you may just have to do a visual inspection in the area for now. Paying close attention to the passives and also trying to peak at the Joints below the IC.
I think we can rule out the DC/DC converter which is providing 3V3PDR as it doesn’t have a direct connection to 1V8PDR.
If you can’t see anything obvious around the EMMC such as corrosion or anything else elsewhere then the methods may have to get a bit more intrusive/direct, be we’ll cross that bridge when we come to it.
It might also be worth switching from continuity to resistance and if you have the option of setting the Ohm scale and resolution etc then set it up so it can show the most digits, pick a ground point, then go round the board with the other probe and see which area of the board represents the lowest reading (miliohms) on these shorted rails > in turn the more likely candidate