Working on an 820-3115 board that has a dead-short on the system side of pp3v42_g3h (pin 2 of L6995) that I'm having trouble locating, because it's tricking me. I removed all normal suspects, and the short remained. Nothing gets warm at all when I inject voltage, and I also have no green light, so I decided to pull the SMC (I originally re-balled it because it had liquid underneath). I removed the original/re-balled SMC, and the short is gone. Cool. So I replace the SMC, and the short returns (with an entirely different SMC). Hmm. I guess it's possible this second SMC is bad (from a parts board), so I replace it a third time with another clean-pull SMC from a board that had a bad CPU. Same thing--short returns when SMC is in place.
At this point I'm confident (fairly) that the SMC itself is not the issue. I checked each pin of the SMC with the SMC removed, but none of them show a short. I'm out of ideas, and have no idea where to go from here.
Thanks.
At this point I'm confident (fairly) that the SMC itself is not the issue. I checked each pin of the SMC with the SMC removed, but none of them show a short. I'm out of ideas, and have no idea where to go from here.
Thanks.