Hi, a few years ago I bought an xps 7590 and about a year ago the motherboard on it failed. I've been trying to diagnose the issue for the past few days.

The things I have noticed that seem relevant are that ALWON is 0.0v, and ACAV_IN is 1.6v. Tracing back to PU1901 seems to show that the logic gate there is receiving the appropriate inputs and VCC. If I short VCC to the output with my probe, the other side of the gate will rise to 3.0v, and then RTC voltage will rise to 2.2v. The MEC will then get quite hot, and after about 20 seconds, the RTC voltage will fall to 0.4v, and the other...

Re: Dell XPS 9550, Unknown Charger

Hi everyone, it appears that replacing PQ100 just fixed the problem. I didn't evaluate if I was actually still having issues after I replaced it because the multimeter reading didn't change, but it actually started working so, go figure.

Hi, I recently got an XPS 9550 that won't charge due to the "Unknown Charger" PSID issue.

I replaced PQ100 to no change, PR102 reads at 33 ohms, PR101 reads at 2.2k. When PQ100 is removed, the source pad reads at 3.3v, the gate reads at 5v, and the drain at 0v. When it is in place, both drain and source read at 1.4v, and gate still reads at 5v. PD100 is blown clean off and as such reads basically open.

I don't know what exactly to do from here, except maybe investigate PQ101.

Re: New Members - please post your introductions here

Hi, I'm an idiot from the S/E US who has an Atten ST-862D, radioshack flux, and too much time on their hands.

I'm currently working on a cursed XPS that has had most of its parts replaced, essentially becoming an XPS 9550, from originally being a 7590. I'm a surplus person, so it went on the back burner until a found some broken surplus XPSes recently, but its current iteration has some issues.

You'll probably hear about that anyway.