Hey guys, I have a non-working nintendo switch that I’ve cracked open and had the pleasure of finding liquid damage where some parts are looking pretty bad. Checking around and replacing the M92 I have these current issues but unsure where to go from here, any advice + hints would be great I’m trying to learn.
On further inspection the little black component above the 55 OHM resistor is pretty damaged and there’s exposed copper around it on the right side, does anyone have an ID of this little fella?
Looks like a diode to me.
Any idea what diode it could be/how I would find out? cheers
Searching around a bit more I’m thinking the issue may be on the SYS rail. Is there a resource available that can help me understand what components/IC’s are on what power rails?
where exactly was the liquid damage area?
The vsys 55 ohm seems a bit low(normally 100 ish on v2/lite board with tvs diode present) but might due to the meter or whatnot.
You should fix the short cap near m92t(replace m92 most case) prior to find out a TVS diode replacement( they dont go bad usually).
FYI console would work without the diode, feel free to remove it if you think that was something wrong on it.
Thank you, I’ve found some shorts on the caps around MAX77812 as well and removing that removed the shorts, the resistance values still differ from the working board I have but I’ll order a m92 and max77812 replace them and report back, cheers
Alright, I’ve gotten and replaced the M92 and Max77812 (I’ve not installed BGA before so I’m not that confident in the install) and the shorts that were near these are gone, but still no luck with the system, I’ve attached an image of main rail resistances to ground if that helps isolate where I should be looking for issues.
all fine afaict
Might wanna check 3V3PDR and SYS rails too.
Resistance?
Also might be worthwhile posting some images of your board, M92, BQ, Fuel gauge areas as well as any other area where you saw corrosion initially.
Given you mentioned corrosion / damage around BQ IC and the fact you had a short on your SYS rail, I’d probably replace BQ IC as a matter of course, remove the diode as @jkyoho suggested and I’d make sure the 2R2 coil is intact and not damaged (better yet just replace it if in doubt) as I suspect this coil was getting pretty toasty at some point (will know better with your images)
Alright I’m waiting on a BQ IC now. 3V3PDR is neat the ENXX chip on those big caps right? Everything seems ok up there no shorts. I did some voltage testing as well and something is quite wrong. I’ll update with pictures with a microscope next time after I get this BQ installed.
Yeah I think given your not getting an output on your SYS rail then BQ is likely the problem (red) most other rails derive from this.
though make sure that you also test this with the battery connected too just incase you have USB issues / intermittent