[SOLVED] Asrock z390 cpu ram mobo defect

[aaj007]

Hi,

i've a problem with my Asrock Z390 Phantom Gaming 6 so that there is now a debug Code with 55.

Installed is a Intel Core i9 9900k and 32GB, SSD and a RTX 2080.
As powersupply is installed a Dark Rock 850w.

Normally all was Running fine but i was testing with offset to undervolting the cpu to setup a value with -0,060v (-60mv).

Stresstest with Prime95 was running well and the power consumption was by 180W (avx) and temperatur was by 72 degree for 10 minutes, then i started the asrock tuning tool and saw the voltage for offset and has change the value about 5mv and after that the system stopped and rebooted.

Since then there stands now the debug code 55.

I removed the cpu and RAM, do a BIOS Reset but that was not helpful.

So I placed one RAM module on each port but that changed nothing. Power turned off meantime.

I took the RAM modules and installed them into another PC, this one starts fine and no debug code, windows has started.

So my question is now, how i can find out that cpu is broken or is it possible that the mobo is broken too?

Thanks a lot.
André

 

[mdd1963]

With power removed--

Have you tried removing/disconnecting all storage, any/all RGB strings and cooling fans except for one to CPU FAN header on mainboard, remove the GPU, drop down to one RAM stick, remove BIOS battery, hold PSU switch down several times to drain, reinsert BIOS battery, connect monitor to onboard video out? (Display Port or HDMI), reapply power , retest. (Make sure CPU power is still connected from PSU to mainboard, an 8 pin (CPU ATX12V)

Once down to only mainboard and CPU, it will require a known good CPU tested in your mainboard, or your CPU tested in known good rig to really go any further...(Assuming your PSU is known good, of course, and although the timing of the malfunction sounds mainboard related, it would be a shame to not eliminate the easier options first...

 

[aaj007]

Hi,

the mobo is defect, new CPU was killed directly so that i must buy a new mainboard too.

now it is working. Thanks