Hey there, I’ve got a switch with a shorted cap in between BQ and the coil next to it. With the coil, BQ ic, and the cap itself removed the short is still present. Also, the cap right above it behaves strangely. When the battery is connected it reads -600 but with it disconnected it had a normal value. Does anyone have any ideas as to what’s causing the short?
This is the VSYS line. It delivers power to the most ics.
Maybe you are lucky and you can find the short by looking for an heat spot.
Or you are able to see something at the spots which indicates a broken cap or ic.
In my case a bypass cap from the max77621 left from SoC was broken and shorted the whole line.
For me it has often been the MAX chip just below the SOC also.
Yup it turned out to be a cap right next to the max ic under the SOC. First cap causing a short for me. Thanks for the help!
Was a cap next to the max ic that was causing the short, not sure if it was the bypass cap though. Thanks for the help!
this cap shorts aswell if you have a faulty ALC audio chip.
I’m only mentioning this, if some stumbles on this thread
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I had the same short and I found this: tiny BGA component It is labeled En0r but I’ve seen different numbers in other photos. I noticed this looked discolored and thought nah it couldn’t be that. After pulling 2 max chips and the BQ I decided to pull whatever this thing is and the short is now gone. Hope this helps someone. It’s near the audio ALC audio IC chip. I need to find this part and a resister and cap that flew off when taking multiple ic’s off. This is NOT easy.
I had an image attached but cant post being new on here.
Do you happen to know what the ENIR IC is above the ALC? I need to find one of those.
Thanks for the picture with the PN. I didn’t see it at first. That is the part I needed.
Well…. I replaced the discolored RP602Z330C chip that when pulled cleared the shorted caps. With the chip back on the shorts are back. Must be more problems. Not looking good.
Did you finally find out what was the issue?
After I pulled an 8316 IC chip upper left of board by the LCD connector the shorted cap by BQ cleared. I am in the process of putting all the chips I have taken off while hunting this down back on. I’m not sure it will ever work again after this carnage, but I had to know. I removed the 9 pin bga ALC ICs.Super tiny. Pretty sure I dont have 1 of them seated properly. I’m gonna go through the power rail checks tomorrow and see what I have and dont have. I had both max77620 and 77812 audio IC, BQ, ENXX pulled in addition to a host of tiny 0201’s that flew away and I had to locate values for and figure out where they go, so I may have created more problems than I fixed searching for this dang short. Good luck to you. It is frustrating when it wont show up with voltage injection/thermal camera monitoring.
I noticed all the caps close to my MAX 77620 were shorted in addition to the cap near BQ. Those cleared after pulling the 8316 IC also.I need to research what this chip is and what the circuit does. Just googled it. Looks like a display driver?
I hope this ends up being a solution.
On my side I have a short on the 3.3V rail, as you did, I pulled everything, the last chip remaining is the APU… Maybe tonight I’ll try to remove it just to figure out if the short is well coming from it. If yes, only a reballing or a transplantation will solve the issue. But so far I don’t have the proper stencil, so it will wait weeks before it arrives from China.
Good luck with it. It will be nice knowing where the short is at least. I bought the direct heat Switch stencil on Amazon. It has worked so far for several of the chips I pulled.
I removed the APU, but the short is still there. I am afraid I have to consider every little component from now. Will try maybe to inject voltage on the rail to check if one gets hotter. To be continued… 
Oh no. Maybe a shorted cap somewhere?
yes certainly it will be a very meticulous and tedious search I am afraid…