Asus Z370-E (Dead)

[idj4]

Hi All

I have an Asus Z370-E that doesn't start. The power LED by the ATX block lights up but nothing starts. When I push the power button or short the pins, the fans twitch for a split second and then nothing. The PSU needs to be turned off & on again to repeat this process. The -12v pin on the ATX block seems to be shorting to ground. I've no idea what this pin feeds, but I'm guessing it shouldn't be shorting. I hoping to find a Boardview file to get some idea of what connects to what.

The board was working fine until it swapped it to another case.

Does anyone have an idea please of what the problem could be?

Regards

Ian

[jiroy]

Re: Asus Z370-E (Dead)

Who swapped the case ? .. You say "it swapped" . If you swapped it , then I suggest to dismantle everything from zero , and start all over again , check for any loose screws stuck under the board , any scratches inflicted on the mobo , check for any anormalities , reset the memory modules , re-insert all the connectors firmly , check if any present Pci modules are firmly seated , check if you forgot a pin connector , check if the CPU fan assembly is well seated , check if the Hard disks cables aren't bent or shorted , etc ..
If those measures didn't work , try to disconnect all parts input , including Hard drives or SSD , dvds , mouse , keyboard , USB devices , etc .. to see if things change and have a normal boot .
Good luck

[harp]

Re: Asus Z370-E (Dead)

Are you have an Asus Z370-E that doesn't start, or you have the bad PSU that doesn't start Asus Z370-E?

You have +5vsb...
Is psu running (/w ps-on) with all correct voltages without connecting to anything, fan is working?

Is -12v short to ground on psu side or on mb side?
How do you measure that and what is the reading you have?

[idj4]

Re: Asus Z370-E (Dead)

Who swapped the case ? .. You say "it swapped" . If you swapped it , then I suggest to dismantle everything from zero , and start all over again , check for any loose screws stuck under the board , any scratches inflicted on the mobo , check for any anormalities , reset the memory modules , re-insert all the connectors firmly , check if any present Pci modules are firmly seated , check if you forgot a pin connector , check if the CPU fan assembly is well seated , check if the Hard disks cables aren't bent or shorted , etc ..
If those measures didn't work , try to disconnect all parts input , including Hard drives or SSD , dvds , mouse , keyboard , USB devices , etc .. to see if things change and have a normal boot .
Good luck

I have the board on the work bench and the only components I'm trying it with/without are the CPU & RAM. I have a second identical board that I tried so I know the components & PSU work ok. There is 3.3v at the power pins and 5vSB. I've looked closely under a magnifier and can't see any obvious damage.

I've read that the power up process is controlled by certain component(s) that detect the voltage across the power pins when they are momentarily shorted through the power switch, which then turns on the PSU to supply the 3.3v, 5v & 12v to boot up the board, but I don't know what component(s) do this. If this component(s) has failed then there's nothing to detect the 3.3v across the power pins.

Regards

Ian

[jiroy]

Re: Asus Z370-E (Dead)

I have the board on the work bench and the only components I'm trying it with/without are the CPU & RAM. I have a second identical board that I tried so I know the components & PSU work ok. There is 3.3v at the power pins and 5vSB. I've looked closely under a magnifier and can't see any obvious damage.

I've read that the power up process is controlled by certain component(s) that detect the voltage across the power pins when they are momentarily shorted through the power switch, which then turns on the PSU to supply the 3.3v, 5v & 12v to boot up the board, but I don't know what component(s) do this. If this component(s) has failed then there's nothing to detect the 3.3v across the power pins.

Regards

Ian

Good work , then I have to assume you know there are two distinct memory channels , you have reset the bios , and the other common checks . If you have same board , it's worth to swap Cpu for testing .. I sold many cases with this Asus board , but unfortunately , i don't have one right now , and schematics are unavailable . Yet , i'll try my best to do some researches concerning it .. Members here might help too ..

[idj4]

Re: Asus Z370-E (Dead)

Update:

For some strange reason the board is now booting. As mentioned before, I had 3.3v at the two power pins.
After some reading & watching YT, I believe this is the start-up process:

When the power button is pressed, which momentarily shorts the pins, the 3.3v should drop to zero because the pins are being grounded, and a signal is then sent to the Super IO chip to power up the PSU & boot up the board. If the voltage doesn't drop to zero then no signal is sent and the board won't power up/boot

I checked to see if this was happening, which it wasn't. I then bridged the ATX green wire to the ground pin of the boards two power pins. The board kicked in to life, but at the same time I noticed a tiny capacitor start to glow red so I quickly turned the PSU off. Since then the board boots up but the said capacitor doesn't glow red but gets too hot to touch.

Would this indicate a short? I've arrowed it in the pic. The tiny one left of the round ones.

Regards

Ian

[jiroy]

Re: Asus Z370-E (Dead)

Update:

For some strange reason the board is now booting. As mentioned before, I had 3.3v at the two power pins.
After some reading & watching YT, I believe this is the start-up process:

When the power button is pressed, which momentarily shorts the pins, the 3.3v should drop to zero because the pins are being grounded, and a signal is then sent to the Super IO chip to power up the PSU & boot up the board. If the voltage doesn't drop to zero then no signal is sent and the board won't power up/boot

I checked to see if this was happening, which it wasn't. I then bridged the ATX green wire to the ground pin of the boards two power pins. The board kicked in to life, but at the same time I noticed a tiny capacitor start to glow red so I quickly turned the PSU off. Since then the board boots up but the said capacitor doesn't glow red but gets too hot to touch.

Would this indicate a short? I've arrowed it in the pic. The tiny one left of the round ones.

Regards

Ian

It's now your skill to catch the culprit .. Look for , on its rail nearby resistances , a heating mosfet , or if there are a schotky diode and check if any of those electrolytic capacitors was lifted from one of its legs by accident ..Those are my first guesses .

[harp]

Re: Asus Z370-E (Dead)

It's now your skill to catch the culprit .. Look for , on its rail nearby resistances , a heating mosfet , or if there are a schotky diode and check if any of those electrolytic capacitors was lifted from one of its legs by accident ..Those are my first guesses .

... check everything else, but ignorring red glowing capacitor?

[jiroy]

Re: Asus Z370-E (Dead)

... check everything else, but ignorring red glowing capacitor?

That one is already toasted ..Why should he check it ?

[harp]

Re: Asus Z370-E (Dead)

That one is already toasted ..Why should he check it ?

Maybe because:
"... but the said capacitor doesn't glow red but gets too hot to touch"
So, it is not yet dead.

Maybe the glowing one has burnout pcb... inspection is needed.

[jiroy]

Re: Asus Z370-E (Dead)

Maybe because:
"... but the said capacitor doesn't glow red but gets too hot to touch"
So, it is not yet dead.

Maybe the glowing one has burnout pcb... inspection is needed.

Its value has changed definitely .I recommend changing it anyway .

When he changes it , of course he knows how to solder and I know he's capable.