I'm back for updates!

Well, for a change I did fucked it up again lol. The new DRMOS I've installed in the other phase now doesn't work as well, nice

I've tested the frequency again and found out that the phase that I've said was working had a unstable frequency and wrong duty cycle compared to the other 2 mem phases on the pci power.

Seems like I gotta get my soldering together, this card ain't going to repair it self!

I wonder why the one drmos I've "successfully" soldered is giving out the wrong signal.

I think you...

Something came through my mind: Maybe, some other mem phase got shorted while running the card with one less phase.
I've tried the short finder method [USER="210636"]dicky96[/USER] teached in his youtube channel. ([url]https://www.youtube.com/watch?v=P_2GGNr4q1s[/url])

There's these test points for the DRMOS:

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The gpu phases reads 3.09khz, mem reads 3.89khz, what doesn't sound right about it?

For renting a scope I'd need a valid enterprise registration and having problems with mine right now. If there's the need of one to be sure, I'll just send the card to someone that knows what he's doing 😫...

Oh, something I didn't mention before: I had errors on all mem bank other than C and D if I'm not wrong while the phase was out. With the phase I get no errors but any test that stress the card fails. Not sure if it would help tho.

bruh, I hope not. The card didn't show any problems before the shitshow I've made.

I'll be sending this board to a professional when the guy responds me....

Hello there!

So, I have this sapphire nitro+ that is a pain as there's no diagrams of this specific model anywhere. Put that together with the fact I'm just learning.

This buck converter is giving me 275 mV output when it should give 1.8V, I'm not sure what exactly modulates this converter and I'm going to spend the day learning about converters.
Could be a faulty one, but I've already replaced it one time, have just another one left. I don't wanna mess up the other one if this is something damaging the component when I turn the card on.

Ah, I don't...

I've tried soldering a new drmos in place.
Phase measure fine but still getting artifacts, didn't measure it again to see if the phase died again (the past time I've had a bad hz reading, the card booted but then the phase died, so its an option.)...

My multimeter reads up to 30mhz, its a hikari 2090
I'm not buying an oscilloscope right now, if I really need one I could rent it.
But I don't think one would make or break this repair, right?...

I got this 3090 wich I own, same board as the common 388_50 boardview.
I'm new to SMD work, and in a moment of stress trying to solder a 0402 filter cap that I've knocked out I've made a big solder mess in the "U42" drmos.
As past is past, after getting a pre heater now I succesfully unsoldered the chip but I'm having problems soldering it back again.
At the last time I've worked on it, I had to reflow it as it was not giving any out signal, measuring using the Hz function in my multimeter.
Now I get a reading of something like 1.7kz while other phases 3.09khz...

Hey guys, been curious about eletronic stuff since I was little, going trough the stuff inside and out.
Now I'm trying to make a buck with some repairs and learn some more as that curiosity never ends
I see that we share this so I'm happy to be part of the forum!