Yeah give that one a go.
It seems like it will work.

The one thing I will say about reballing BGAs theres not many people out there who can and will help you.
Much of what I do is trial and error. Watching youtube videos and giving it a go because you cant break whats already broken.

I have those generic stencils, this is the one that fits perfect, 33x33 0.6mm 1mm pitch

also make a square shield like this of metal sheet, it will keep the heat around the chip and solder balls melt way faster, also prevents the caps and plastic connectors around the chip getting blasted by hot air.

you said one chip got shorted after reflow, you might have moved it too much and shorted solder balls under it,
since chip is out, measure vcore and memory rail to the ground on the chip, vcore should be around 10 ohms:

Vcore on the bad chip is 14.8ohms while on the "good" one is 17.4ohms.
Data is above 200ohms on each chip.

And yeah, 99% sure some balls got shorted. Why else would one of the traces on my board burn after I powered it on with the bad GPU.

As for which balls got shorted, I bet it was the middle or parallel to the pin 1

Karbist wrote on 2025-03-25, 18:19:

I have those generic stencils, this is the one that fits perfect, 33x33 0.6mm 1mm pitch

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Question, did you use the reballing paste (the one with flux + small solder balls) or normal balls?
And one more thing, was your chip an FX 5500? If so did it really have 0.6mm ball size?

I use 0.6mm leaded solder balls, fx5200 and fx5500 both are the same and 0.6mm solder balls fit well on them, you can use 0.50/0.55mm if you want.

Okay, I have ordered the stencil + BGA paste. They should arrive next week, so I will have something fun to do for the next week 😅

I just hope it was an dead core and nothing else..... The blank screen scares me on the blue card. But it displayed for a while after I reflowed the core, although it was moving to the right until the card stoped displaying anything and went to a blank screen (signal was still generated, could see the resolution changing when it was booting into windows)
Another idea might be a dead eeprom/bios rot but who knows....

Stencils just arrived. Stupid chinese manufactuer put 30x30 on an 22x22 stencil 🤣 Anyways it seems that both 0.6 and 0.65mm ball size matches, but I'll go with 0.6mm first.
As for the paste it's still not here.

Okay, after too much time spent attempting the reballs, I can say that the paste sucks. It's not that the paste itself is bad, just the user (aka skill issue).
Note for beginers: it's better to buy the ball size.

For users like me it´s better buy another graphics card 😀 But wish you good luck.

Okay, ordered 0.60mm and 0.65mm balls. Hopefully that'll fix this card once and for all. No idea if this is even gonna work, I just guess it's the core.