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Sapphire 6850 - Transistor fall? - Page 2

post #11 of 24
Quote:
Originally Posted by CL3P20 View Post
Thats just absurd..
What part of that is absurd? It's fact. Capacitors are often used inline with a signal to block the DC component.

Edit: As an example, take this basic linear power supply design into account:



If capacitors passed DC capacitor 'C' would short the DC power rail to ground. But because capacitors block DC and pass changing waveforms the some of the remaining AC component, rectifier noise, etc. are passed to ground to smooth the output. This is getting pretty off topic but a higher quality design would bypass the four bridge rectifier diodes with small value ceramic caps to kill the switching noise partly because larger capacitors can't respond quickly enough to filter it out effectively.
Edited by AMD20x6 - 8/5/11 at 11:26am
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post #12 of 24
Quote:
Originally Posted by AMD20x6 View Post
What part of that is absurd? It's fact. Capacitors are often used inline with a signal to block the DC component.

Edit: As an example, take this basic linear power supply design into account:



If capacitors passed DC capacitor 'C' would short the DC power rail to ground. But because capacitors block DC and pass changing waveforms the some of the remaining AC component, rectifier noise, etc. are passed to ground to smooth the output. This is getting pretty off topic but a higher quality design would bypass the four bridge rectifier diodes with small value ceramic caps to kill the switching noise partly because larger capacitors can't respond quickly enough to filter it out effectively.
In that regard you are correct.. but thats not how the caps in the pic are utilized. They are "passing" DC voltage as a bridge, from the '+' power plane to the component.. I did not mean they were discharging to ground.
post #13 of 24
Quote:
Originally Posted by CL3P20 View Post
In that regard you are correct.. but thats not how the caps in the pic are utilized. They are "passing" DC voltage as a bridge, from the '+' power plane to the component.. I did not mean they were discharging to ground.
I'd be curious to see a schematic of this. As far as I'm aware, the worst that could happen is that the power rail would lose some filtering.
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post #14 of 24
Quote:
Originally Posted by AMD20x6 View Post
I'd be curious to see a schematic of this. As far as I'm aware, the worst that could happen is that the power rail would lose some filtering.
Partially correct again.. DDR has more than 1x power input and source.

There is vDDQ and vDDr [or vDDc] ..each of these are separate power inputs to each IC..assume there are 4x inputs [2x for each type].. if 1x goes, the IC does not work..

With even 1x IC not working- the Integrated Mem Controller errors.. [for some gpu's there is multiple IMC's to control RAM]. If its the last IMC in the chain.. the GPU may still boot up and just 'not see' the disabled IMC. On the other hand if its the first IMC in the power supply chain..it not powering up, could prevent boot.

*Im not an electrical engi, but can follow a spec sheet pretty well. From my experience modding GPU's.. loosing a single SMD on memory may/may not affect the GPU.. it really just depends on the PCB in question. From the pics in the OP.. I would day the SMD cap is for vDDr ..the main power input for the IC.
post #15 of 24
Very unfortunate.
Do hope you manage to work it out.

After all what do you have to lose?

Only gain...
 
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post #16 of 24
Yes, I realize that the loss of a power rail will cause problems. I'm just trying to ascertain how the loss of a capacitor would result in the loss of the power rail entirely. Since DC power can't pass through a capacitor I can't think of any configuration that would see the loss of a capacitor resulting in a break of the DC rail.
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post #17 of 24
i dont understand how your saying "DC cant pass through a capacitor" ... since the input and output caps on a GPU do just that.. they "pass" DC from the input or output power plane in the PCB to the contact plane the components are soldered to..
post #18 of 24
Here's an example, a subset of a schematic for an FPGA board. Many of the power rails are filtered by SMD capacitors presumably to reduce ripple. But they're installed in such a way that the loss of any or all of those capacitors will not break the DC connection to the IC- that would just reduce the quality of the noise filtering. So you're right if by "passing DC" you mean that the capacitors are a part of a basic circuit that passes DC to the memory ICs- I'm just using the EE 201 definition of "passing" meaning "to go through".



Edit: The caps also provide a small reservoir for quick spikes in current demand.
Edited by AMD20x6 - 8/5/11 at 12:36pm
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post #19 of 24
Thread Starter 
Wow, you really know this eletronic things..

I went to a place where they fix video games and asked if they could sold that for me..

Here's the result:






He did a good job??



I'v played for around half an hour with my OC settings on and had no problem...

I'v runned 30 mins of furmark too, with max settings etc... X-burn...

And it went fine...



Should i worry about anything now?


I'm rep+ every1 who helped.
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post #20 of 24
Should be OK mate! Looks like an alright job, will likely be just fine
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