RTX2060/NCP81611 Issue

[manuforti1314]

Questions on the NCP81611 please, my RTX2060 was working with an odd issue of the not powering on at first boot, always needed a soft reboot then ran fine.

The card originally had a blown fuse and faulty DRMos, I'd fixed them and the can ran since albeit with the boot issue.

Issue now is the Vcore has gone AWOL.

The controller is a NCP81611, I've changed this twice with no change.

I've been using a schematic for the MSI 2060/2070, this seems very close although my board is a Palit which seems to have a few less components on it.

I've got 5v VCC, 2v VREF, 3v enable but only 10mv on PGOOD on the NCP81611.

It there anything else I should check, this NCP81611 is more complex than any others I've worked with so I might be missing something?

Thanks

[manuforti1314]

Re: RTX2060/NCP81611 Issue - Now Boots

Questions on the NCP81611 please, my RTX2060 was working with an odd issue of the not powering on at first boot, always needed a soft reboot then ran fine.

The card originally had a blown fuse and faulty DRMos, I'd fixed them and the can ran since albeit with the boot issue.

Issue now is the Vcore has gone AWOL.

The controller is a NCP81611, I've changed this twice with no change.

I've been using a schematic for the MSI 2060/2070, this seems very close although my board is a Palit which seems to have a few less components on it.

I've got 5v VCC, 2v VREF, 3v enable but only 10mv on PGOOD on the NCP81611.

It there anything else I should check, this NCP81611 is more complex than any others I've worked with so I might be missing something?

Thanks

Card now boots. Embarrassed to say I'd installed a resistor in the wrong place on the card, there is a series of empty pads with the odd resistor here and there. I recall changing the NCP81611 and having to sort out one that had blown off the pads. Put it back on the wrong place.

Still got the odd booting issue. Need to soft power off at first boot then it starts fine.

[ongobongo]

Re: RTX2060/NCP81611 Issue

were you able to fix your strange booting problem?
I have the exact same problem with a Gigabyte RTX-2060 i've just fixed.
I had a shorted capacitor at 5V rail and after fixing that the card worked, but only when doing a reset after powering it up.
Cheers

[manuforti1314]

Re: RTX2060/NCP81611 Issue

The card works fine now. Not totally sure I can claim to have fixed it.

I took the card apart again and noticed that I had a thermal pad in the wrong place, instead of being on top of the inductors it was over the section of the card with the crystal and the logical and gate for PEXRST. I moved the pad and put the card back together. Works fine, every time.

I cannot imagine that doing this actually fixed anything however it has.

The fault had me baffled, I could never really understand why the card never started normally but always started with the quick reset after power on.

When I was troubleshooting the NCP81611 issue it was not getting the enable signal unless I did the quick reset.

[ongobongo]

Re: RTX2060/NCP81611 Issue

Thanks for the answer.
I just managed to fix the issue on my card.
I'm not very experienced when it comes to GPU repair, in fact, this is my very first attempt.

During fault search I took of the NCP and the PWM controller as well.
After finding and fixing the main problem - a tiny cap went bad - I put the two chips back. After that the strange behavior appeared.

Yesterday evening I took some time, re-seated both QFN-chips and touched up all connections to the pads.
After that, the problem went away and my card is now working as expected :-)

I highly guess - as you worked on the same area - that the problem has to do with the NCP and/or not perfect connections from the chip to the pads.
Maybe your fix put pressure on the right spots of the card and fixed a not perfect fitting by accident?

Anyways, thanks for your feedback and help on this.

Cheers
ongobongo