Radeon x1600 Pro Vcore? (polymod intent)

[Khron]

I got my grubby mits on a busted Club3D Radeon x1600 Pro video card on monday, and i only got around to it today.

One vented Sacon FZ at one buck converter on one corner of the board, and an apparent drain-to-source short on one of the FETs of the other buck, at the other end of the board. the latter had two 1000u/16v FZ's after it.

I proceeded to unsolder all four fets, and replaced them with slightly higher current-rated ones (off a junked mainboard). Now, just before replacing the fets, i measured again on the pads - the short was still there I took of that pair of FZ's and sure enough, short's gone.

Now, i don't have any caps in my stocks that are as short as the originals, but... Would poly's rated for 4v be enough? I've got some Chemicon poly's and some Oscon's.

Surely the GPU's Vcore can't be higher than 2v... Right?

[Old Thrashbarg]

Re: Radeon x1600 Pro Vcore? (polymod intent)

As long as the caps are actually on the output side, then yes, 4V caps should be fine. The GPU voltage on a stock x1600 is somewhere in the range of 1.5V I believe.

However, you said you measured pads for a short, that would indicate that you have a multimeter, meaning that you can measure voltage too. That's the best way to be sure, just plug in the card and power it up, see what sort of reading you get across the legs of the caps (or rather, across where the caps were). It won't boot properly with the caps removed, but you'll still have the voltage there.

[b700029]

Re: Radeon x1600 Pro Vcore? (polymod intent)

16v seems more like it's the input side (12v). As above poster said, better to check.

[Khron]

Re: Radeon x1600 Pro Vcore? (polymod intent)

On the input side, both buck converters have a Sanyo 470u/16v. The FZ's i removed had their + leg connected to the source/drain connection of the upper/lower FET, so i'm quite positive they're on the output side