MSI G55 Z97 sli no post but everything good

[chaos-theory]

Hello people, I have an MSI G55 Z97 and everything spins there is vcore and the CPU gets warm there is 3.3v to most bios pins including CS# now CS# is active low so I don't think the chip is selected until it gets grounded, and I checked

• VRM_PGD 3.3v
• DPWROK and its 3.3v
• H_PWRGD which I don't know what it means but has 3.3v
• PLRST# and it has 3.3v but i dont know if it should be grounded or not
• RSMRST# which gives 3.3v
• DDR3_DRAMRST# and it gives 1.45v

PCH is getting warm slow just as the CPU, I connected a speaker but I don't hear any beeps even with the ram disconnected, I plugged an old diagnostic card on the PCI slot and it shows rst just as I press the button then there is no code the led q-code doesn't light up at all
I Have no idea what to do next I tried pushing the PCH down but same thing, sometimes the motherboard turns off by itself, stay a bit then turns on again, sometimes it does it quickly but most of the time it just stays on and spinning, thank you all beforehand
The boardview file is attached below

[MOD EDIT] Link to boardview --> https://www.badcaps.net/forum/troubl...ms-7921-rev1-0

[chaos-theory]

PS: I did flash the bios several times with different versions but I don't think the bios rom is being executed at all
SLP_S3# and SLP_S5# are 3.3v
PwRGD on atx is 5v

[anikin73]

You got to check the main voltages whether all have …. Like ram voltage, 1.05v, vccio, 1.8 v etc. and the clock signal at pci slot …liklely your bios did not run at all.

[chaos-theory]

Those are the closest pins I found related to what you asked for :
Vccio_out 1.0v
Vccio2pch 1.05v
VCcioA 0.99v

Vtt_ddr 0.75v on all slots
Vcc_ddr 1.5v on all slots

PCI smclk 3.5v
PCI vcc 12v
PCI +3.3v 3.3v

What to check next I don't have an oscilloscope so I can't check for clocks, what do you think could be the problem?

[anikin73]

OK let me give u afew pointers to help- check whether boot up cycle complete , all voltage appear
1) PCIE A11 =3.3V , PCIE A13 AND A 14 = 0.5V ( ABOUT)
you can check cpu voltage appear at the main mosfet , up6282 _ ph1_ A for cpu voltage.
check Vccst_pwrgd .

If have then your PCI diagnostic card does not run means the bios CODE never run at all. It seems all your voltages do appear. So have to go to bios and use oscilloscope to check whether bios is read.

another thing u can check is superIO voltage detection Vin0 Vin 8.
or may be just a dirty cpu pin that prevent commmunication.
usually for your case it is very hard to diagnose and check for fault as all voltages did appear.

[chaos-theory]

PCI_a11 3.40v
Pci_a13 0.43v
Pci_a14 0.39v

UP*_ph1 9.78v
Vccst_pwrgd 1.08v

Vin0 0.96v
Vin8 0.89v

I don't really have an oscilloscope to test the bios, is there an alternative here?
I totally don't understand how can everything be present and the card not posting, maybe I need a newer diagnostic card the one I have is too old, what should I do next?

[anikin73]

Usually like that is very hard to repair one. Have u tried to use a gpu to boot up ..in the event u are using the cpu igpu.
the code might be running but u do not know.

other than that, pch is gone.
move on.

[chaos-theory]

I tried to use an external card yesterday, but how do I know if the PCH is dead? It's outputting voltage normally, I am panicking and I want to repair it I bought it a bit expensive so I need to at least return my money