Seems normal without emmc but CPU should not go hot in that case. Warm but def not hot
No worries, that seems more like normal
Itās not your fault. Iāve seen quite a few people refering to this rail as the āCPU railā and in turn that cap below M92 which resides on said rail as the āCPU capā ⦠not really sure where that all started but what youāll find as you become more experienced is the repair community (particularly the youtube repair crowd) is itās a vaccum and it only takes one person to get something wrong or to do something stupid and others who donāt know any better will copy and the cycle repeats⦠for example, one idiot starts using a rotary tool with a diamond bur to remove solder mask <0.1mm thick (the same bur Iād use to drill holes in masonary, tiles or glass) and then every man and his dog starts doing the same thing
That all being said, the SoC is also connected to this rail but so is pretty much everything else - itās produced by the PMIC which is why after you reballed it seemingly cleared the short here.
Yeah could be. Itās entirely possible now though, given that this IC produces some all important rails for the SoC and if things were touching which ought not to have that the SoC may have died, or the PMIC might be bad in and of itself.
Donāt be, this board looks like itās been through the wars anyway⦠plus itās alway nice to have a parts board
These are my next actions.
imma re-ball the ram first and then the soc for fun and see what happens, also i already made the purchase for the SOC stencil so its to late now LOL, its good practice either way.
As for parts, Do you think the PMIC chips are still good in this case? Iāve read they donāt really go bad in other posts here.
im thinking when i reball i should inject voltage again at the coil and see if it still shorts as i take the ram and soc off
Just a word of warning if you donāt know already, you want to get the 80x80 or 90x90 stencil in combination with the jig and preformed balls for the SoC. A direct heat stencil and solder paste wonāt work (or rather your setting yourself up for failure with this type) Iād start with Ram first and go from there.
Details regarding the jig here
donāt know if I covered the stencil to use along with it for the SoC in that topic but it will be there or somewhere else on the forum somewhere
Under normal circumstances the PMIC is quite resiliant but in cases like this where somebody prior has purposely messed with it itās hard to say, all depends on what was going on below it after he/she messed with itā¦
No, search the forum regarding checking your primary rails (resistance relative to ground) which Iāve covered a bunch here to get an idea of if anything is still shorted out and to get a map of the current state of things - if everything checks out then you atleast know what is good if/when you start reballing Ram, PMIC and later SoC (in the event your install goes bad or you damage the chip/s during reflow) all of which youāll be able to test prior to ever connecteing power (far safer) and/or you find the short and in doing so youāll be able to determine if pulling the ICās weāve discussed resolves the issue (whihc we can narrow down if you do find something) - what you were doing earlier was connecting power up to your SYS rail (which is basically the source voltage for most things and pretty well every other rail derives from it in some way shape or form), subsequent short on 1V8PDR (possibly dragging SYS down as a result) trouble is/was your putting other things in the line of fire doing this.