CoolerMaster RS-450-ACLY PSU issue?

[momaka]

Re: CoolerMaster RS-450-ACLY PSU issue?

Okay, so upper CPU VRM MOSFETs are not shorted, at least.

I just had another idea before digging into further motherboard troubleshooting...
Connect that MSI motherboard to a PSU (doesn't matter if it's the Cooler Master or some other one), and with everything connected properly, short the PSU's green (PS_ON) wire to ground. Does the PSU stay on, or does it do the "short spin of fans" again?

Also, I would advise you disconnect the HDD from that PCs while doing these tests. Every time the PSU powers ON and OFF, the HDD goes through a power cycle (or possibly at least counts it), so it is not so good for it. Once you get that motherboard running, then you can connect the HDD again.

[alindumitru46]

Re: CoolerMaster RS-450-ACLY PSU issue?

Ok, the CM psu used keep "power on" without booting mobo....

[momaka]

Re: CoolerMaster RS-450-ACLY PSU issue?

That rules out short-circuit on the motherboard. However, the circuit on the motherboard that controls PS_ON may have some problems. Was this motherboard ever running before? And if yes, when did it stop working?

[alindumitru46]

Re: CoolerMaster RS-450-ACLY PSU issue?

I must admit that the test was wrong approached, because MSI 770T-C45 is not fully functional (has moments when lose BIOS settings and gives a long beep and two short and recovers after 2-3 restarts), because I considered the starting sequence does not necessarily require a verified mobo.
MSI 770T-C45 will be a subject of diagnosis, after a perfect cleaning and strict visual check with a magnifying glass.

Therefore I rebuilt tests with DFI P35 T2RL Blood Iron motherboard, E6300 cpu, 2x1GB Team Extreem dark , Asus HD2400 Pro, the default computer psu - Codegen 350W as "another psu":
1. CM psu 24pins+12V cpu: short spin of fans and shut down;
2. CM psu 24pins only: short spin of fans and shut down;
3. CM psu 24pins+12V cpu from another psu: short spin of fans and shut down;
4. another psu 24pins+12V cpu CM psu:short spin of fans and shut down;
5. another psu 24pins+12V: normal boot to Windows.

[momaka]

Re: CoolerMaster RS-450-ACLY PSU issue?

So the Cooler Master still does the same thing now, even with the DFI board?

[alindumitru46]

Re: CoolerMaster RS-450-ACLY PSU issue?

Yep, almost the same problems DFI P35 T2RL Blood Iron motherboard...
DFI nF4 Ultra-D Expert motherboard was suspected for problems, the MSI mobo was received recently and did not have time to dwell on it, but I thought it's okay to use to verify the CM psu.
DFI BloodIron go smoothly with Codegen psu of 350W, even an ock of E6300 CPU from 1800MHz to 2000MHz for (I tried it 2-3 years ago and she can run loose 500MHz FSB).
I do not know what to say ...

[momaka]

Re: CoolerMaster RS-450-ACLY PSU issue?

I guess you should try a recap on that Cooler Master PSU then. In particular, change all of the very small caps on the secondary side first. Perhaps one of them is messing with the PS_ON or PG signals. It's rare, but I recall someone did fix their PSU here by doing just that. If not, then change the big caps too.