Corsair RM550x "debugging"

[quest for silence]

Long story short, new build, PC started, installed OS, updated OS, some low loads for less than an hour (installing programs, browsing the internet, listening music videos meanwhile), than a very normal shutdown.

After about one hour, just tried to power it up again, it didn't and it didn't anymore.

Paperclip and multimeter, the RM550x spun, then stopped, DMM readings are 3,2V / 12,12V / 5,05V / -12,21V, while connecting test leads to PWR_OK gives 4.97V

I guess it's all correct, right? Might it be a PWR_OK timings issue? If so, might I investigate it with just the DMM? Mobo is an ASUS Z170i Pro Gaming.

[-The_Mask-]

Could be, but maybe if you test again it just works again. But it doesn't really matter right? There is RMA for something like this.

[quest for silence]

There is RMA for something like this.

You're right, but what? PSU or mobo? And how to rule out the RAM sticks?

[quest for silence]

Could be

If I borrow an oscilloscope, what should I check and how?

[ridgid13579]

If I borrow an oscilloscope, what should I check and how?

Wait, did you try the paperclip trick? No need to pull out the big toys out yet.

Take the psu and the 24pin, jumper it. (Have no cables connected to any parts, so take all cables off except 24pin and molex)
If it starts then it's something else probably. Use your DMM on a molex cable (it's much easier to connect the probes on a 4pin) and see if it's close to 12/5, if all good then check your motherboard.

[quest for silence]

Wait, did you try the paperclip trick? No need to pull out the big toys out yet.

Take the psu and the 24pin, jumper it. (Have no cables connected to any parts, so take all cables off except 24pin and molex)
If it starts then it's something else probably. Use your DMM on a molex cable (it's much easier to connect the probes on a 4pin) and see if it's close to 12/5, if all good then check your motherboard.

I'm not sure if I got you ridgid, but:

...Paperclip and multimeter, the RM550x spun, then stopped, DMM readings are 3,2V / 12,12V / 5,05V / -12,21V, while connecting test leads to PWR_OK gives 4.97V...

Tested also pin 9 / 5VSB, @ 5,04V. AFAIK mobo has no known testpoints (though I'd look again for).

[ridgid13579]

Try jumper it to start with the ps_on pins? Maybe bad power switch on case?

[quest for silence]

Try jumper it to start with the ps_on pins? Maybe bad power switch on case?

The RMx started (fan spun then stopped) shorting the pins: the PSU seems fine, the output voltages look close to nominal, just I'd like to know if there's a way I could check PWR_OK timings (with DMM or oscilloscope).

P.S.: forgot to answer, the rig won't light up shorting the mobo power pins, so it's not the case power switch at fault.

[pino800]

fammi capire scusa quest:

tu hai assemblato un pc col rm550x e dopo la prima accensione non è più ripartito??

io sto decidendo di comprarlo proprio in questi giorni e questa è già la seconda segnalazione che vedo in merito a questo problema, a meno che tu non sia lo stesso di questo topic:
http://forum.corsair.com/forums/showthread.php?t=162627

soon translation

[ridgid13579]

Strange. Have you tried a different psu?