dfaber1 wrote on 2022-12-11, 22:28:

Hello,

My Gigabyte GA-6VXE7+ just died. It ill not power up at all with a good PSU. No apparent visual damage. When I check the power rails, I see that +5vsb is connected to ground. All the others are not shorted. Any idea which component could be shorted?

Thanks.

Post pictures in HQ.
Probably some dead mosfet, it's not that simple though.

dfaber1 wrote on 2022-12-11, 22:28:

Hello,

My Gigabyte GA-6VXE7+ just died. It ill not power up at all with a good PSU. No apparent visual damage. When I check the power rails, I see that +5vsb is connected to ground. All the others are not shorted. Any idea which component could be shorted?

Thanks.

What PSU was it connected to it when it died.

Was it one of these Re: A tale of two PSUs ( Fortrex , Deer or similar rebrand with a similar 5VSB design ) ?

darry wrote on 2022-12-11, 23:41:

dfaber1 wrote on 2022-12-11, 22:28:

Hello,

My Gigabyte GA-6VXE7+ just died. It ill not power up at all with a good PSU. No apparent visual damage. When I check the power rails, I see that +5vsb is connected to ground. All the others are not shorted. Any idea which component could be shorted?

Thanks.

What PSU was it connected to it when it died.

Was it one of these Re: A tale of two PSUs ( Fortrex , Deer or similar rebrand with a similar 5VSB design ) ?

Oh dear Odin….

If ever there was a cautionary tale to test on a really good psu checker there it is!

I recently got a nice digital one that shows alp the voltages. Good investment.

The PSU did die at the same time. Most likely took the MB with it. I tested with a known good PSU and the MB won't even power or post. I've removed and checked the LX8384 and it does not seem to be shorted. I've checked the 2 MOSFET K3296 without remove them from the board, but they don't seem to be shorted either. All the caps look Ok, no bulge or leaking. Here are some pictures.

This fault is driving me crazy. +5vsb is grounded for some reason. I've checked every component that I can check and none seem to be shorted. There are 2 capacitor and a regulator that have there pins to ground also but I have removed them and tested them and they are good. The pads re still grounded even when the components marked in red are removed. Unless the issue is in the chipset, any idea where I can look?

You could cut the rail where it goes to the chipset and see if it is still shorted, if not just solder that section back on, then repeat again as u cut sections off the 5v rail and test them all for short. Hopefully u can isolate which section is grounded and what exactly is connected to it

Its dead already, just power it on and check whats getting hot.

I tried to inject power on the +5vsb pin with the bench PSU and nothing is warming up. I cranked the amp up to 1 and only used around 200 mA at 5v. I think that I will mark this board as dead and use it for parts unless someone has another idea.

Thanks.

Maybe the super IO chip died.

Cut the 5v line to the chipset, like its been said its dead anyway and only takes 2 seconds to make a solder bridge over it if you need it back

good luck finding it on a multilayer board supplying BGA chip

Yeah if its the bga czip forget about it, thats why I said quick way to determine it since you mentioned it might be czipset that is shorted

Well, did somebody notice the estrange color in the middle of the super IO chip? Or my eyes are playing with me, or is because of the photo.
The one on the bottom left of the board that has Gigabyte written on it.

Hoping wrote on 2022-12-17, 16:49:

Well, did somebody notice the estrange color in the middle of the super IO chip? Or my eyes are playing with me, or is because of the photo.
The one on the bottom left of the board that has Gigabyte written on it.

Here are some close up pictures of the IC. Since the board is dead anyway, I think that I will start to de-solder parts to try and find out which one is shorted.

dfaber1 wrote on 2022-12-18, 14:37:

Here are some close up pictures of the IC. Since the board is dead anyway, I think that I will start to de-solder parts to try a […]
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Hoping wrote on 2022-12-17, 16:49:

Well, did somebody notice the estrange color in the middle of the super IO chip? Or my eyes are playing with me, or is because of the photo.
The one on the bottom left of the board that has Gigabyte written on it.

Here are some close up pictures of the IC. Since the board is dead anyway, I think that I will start to de-solder parts to try and find out which one is shorted.

2020_0101_000041_001.JPG

20221218_090408.jpg

Check PS/2 connectors and for diagnostic matter remove jumpers that switch power (+5VSB or +5V) for KB/MS

That chip is fairly easy to remove with hot air, it is powered by the 5vsb to control the pson I think. You can also check the diodes around the ATX power supply conector, maybe there's one for the 5vsb and it is shorted but de real failure iselsewere.

I removed the Gigabyte IC and the short is gone. I will order a new one and hopefully the board will come back to life.

Hmmm, it would appear the this IC is hard to find. Anyone knows where I could order one?

I guess only chinesse sellers could have it, another option could be to salbage one from a donor board.