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post #271 of 280
1/14/13 at 8:42am
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No offense, but how about you make a new thread about that or ask in one that covers that topic? thumb.gif


Anyway: Today I got the 20W DC/DC Step down Converter Regulator.

Also, I found my Meanwell S-350-12 PSU . I was wondering if I could run the regulator from there and measure the output instead of having to install the card into the system all the time?



EDIT:

Okay..... game over! facepalm-1.gifbanghead.gif


8A0228DA-81BA-4FF0-A002-6275BDE8FB5A-215-0000003583390EA0.jpg
Edited by Rayce185 - 1/14/13 at 10:59am
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post #272 of 280
1/14/13 at 11:29am
What happens when you power the card up? Or haven't you
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post #273 of 280
1/14/13 at 1:52pm
20W DC/DC Step down Converter Regulator


im I missing something what are you gunna do with something that only outputs 2A
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post #274 of 280
1/14/13 at 2:11pm
Thread Starter 
Quote:
Originally Posted by reggiesanchez View Post

20W DC/DC Step down Converter Regulator


im I missing something what are you gunna do with something that only outputs 2A
20W total input power, assume 93% efficiency (in the spec) during the step down to mem voltage (1.58v), then the output might be ~18.6W which would give you 11+amps at the lower voltage thumb.gif
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post #275 of 280
1/14/13 at 3:57pm
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Quote:
Originally Posted by Rbby258 View Post

What happens when you power the card up? Or haven't you
its in the bin, but I can fish it out tongue.gif
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post #276 of 280
1/14/13 at 7:28pm
Quote:
Originally Posted by Rayce185 View Post

its in the bin, but I can fish it out tongue.gif

Well if it works enough to turn on you can go through with the mod and see if we can finally get the vmem up after all this smile.gif
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post #277 of 280
1/15/13 at 11:59am
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No POST, no chance.

Oh well. I twas fun as long as it lasted. Thanks anyway for your help guys thumb.gif

I may try another project then... maybe a GTX 650? biggrin.gif
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post #278 of 280
1/15/13 at 12:00pm
Quote:
Originally Posted by Rayce185 View Post

No POST, no chance.

Oh well. I twas fun as long as it lasted. Thanks anyway for your help guys thumb.gif

I may try another project then... maybe a GTX 650? biggrin.gif

it dont need to post if it powers up and the vmem reads 1.58v still we can work it it
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post #279 of 280
1/19/13 at 5:45am
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Okay.... so I modified the idea a bit:
I went and skipped the whole installation process by soldering the ground and 3.3V lines from the PCIe connector directly to a PSU I had lying around. The GPU is irreparably damaged anyway, so why not tongue.gif

1DD3A91D-7D82-4189-B557-888421A42212-1600-0000019D2E1DCB44.jpg
935549DF-2BA2-4F00-8194-062B1C367354-1600-0000019D298A4F75.jpg

One of the PSU's 5V lines goes to the new voltage regulator that I got off ebay, the output then goes to the mosfet on the card:

3C6DD6DF-7AB4-4228-BAF9-CA742862DB13-1600-0000019B485CFDD8.jpg
(Ignore the Meanwell PSU under the regulator, it isn't connected.)



The 3.3V line drops from 3.35V (nothing attached) to 2.7V.
The 5V line stays at a steady 4.85V into the regulator, which has trouble reaching above 4.0V output though. I can turn the screw all I want, it still doesn't give me any more.

Nevertheless, I can get the cards voltage to read 1.41V from the original 1.58V line, so at least we're getting somewhere smile.gif


I'll try and connect the voltage regulator to a 12V line and drop the output voltage to the original 4.16V to see what happens thumb.gif




EDIT:
The 12V line works much better, I got the output to exactly 4.16V. The memory's voltage is 1.48V. I need to get the 3.3V line more stable.
Weird. The 3.3V line measures around 9A, the PSU is supposed to manage 30A...
Edited by Rayce185 - 1/19/13 at 6:02am
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post #280 of 280
1/19/13 at 6:23am
I didn't want you to solder to that point, reconnect it and remove the leg underneath it and only solder the wire to the pcb so the bottom leg isnt connected to nothing.
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