Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

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I've a Zotac GeForce 8600GT (this one).

I replaced two blown capacitors FZ79, with two Trec GR 1500uf 6.3v 105°c (those are the only I could get near my home, I live in Argentina).

I tried the card, plugged in the monitor, but all I get is a black screen, the monitor goes out of "power saving mode" and it blinks a few times when booting, but no image appears, only black. (Not black like if the monitor is turned off, I mean the pixels are active but the screen has no image).

Before replacing the blown capacitor the card worked, very bad and with weird lines on the screen, but it worked, now it doesnt. I can't put back the FZ79 to see at least if I get some image (with the weird lines), cause I broke the capacitor connectors when removing them.

Should I use other capacitors for replacement? Or could it be another problem?

I wanna play COD BlackOps and it doesn't work well with my 7300

Regards.

[c_hegge]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

can we have a picture of the card? I've never heard of Trec brand caps. They are probably unsuitable for this application. I'd be using these (Rubycon MCZ)for 1500uF caps.

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Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

These are the blown FZ79 :


And these are the Trec I used for the replacement :



Here's a pic from the card I found with google :



I've read the list of GOOD capacitors, but I am not sure if i'll be able to get them here in Argentina, and I buy them online I dont know if they will be shipped at my house or i'll have to get them on the customhouse, which is pretty far from my house, plus I don't know if they will charge taxes and how much (they charge A LOT for stuff like pcs, cellphones, game consoles, etc).

[yyonline]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Trec website: http://trec.myweb.hinet.net/

But don't even bother. There's nothing useful on there as far as specs go. Assuming their series list is in some sort of logical order, GR appear to be 105-degree general purpose capacitors. If so, they're definitely not suitable as a replacement for FZ, and I wouldn't expect them to work in this application.

[mockingbird]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

You didn't replace it with Trec, you replaced it with drek.

Get something respectable like Panasonic FM, I believe that is what people here are recommending as a replacement for FZ. Secondly, reflow the GPU, this GPU has inherent manufacturer defects as well as problems with solder fracturing. Unsolder all the electrolytics and put it in the oven.

[c_hegge]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Replace all of the caps, busted or not. Sacon FZ ALWAYS fail. I've NEVER seen one last more than two or three years, and I've known them to fail as early as 3 months. It is also very common for caps to fail with no visible signs. I believe that Topcat (the owner of this site) ships to most countries. For the other 470uF caps, use these

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Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Thanks for all the replies, ill try to go to a few more stores to see if I can get some panasonics or other respectable brand, or I will contact this website admin to see if he can help me.

mockingbird: What do you mean with "reflowing" the GPU? do you have some reading I could check to find out more about that? I will do some research tomorrow anyway but maybe you can guide me better.

Regards to everyone.

[c_hegge]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Reflowing simply means melting the solder and thus re-forming the joints. I wouldn't do that unless there is actually a problem with the GPU (ie. After you've replaced all the caps with either Rubycon MBZ or MCZ, Panasonic FJ or FL, Sanyo WG or new Nichicon HM or HN) as it can also damage the joints if they are not bad.

[www]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Reflowing simply means melting the solder and thus re-forming the joints. I wouldn't do that unless there is actually a problem with the GPU (ie. After you've replaced all the caps with either Rubycon MBZ or MCZ, Panasonic FJ or FL, Sanyo WG or new Nichicon HM or HN) as it can also damage the joints if they are not bad.

Thanks for clarify that for me. I think I will try by only replacing all the caps first, it looks like i can really mess things up by "reflowing", I guess I'll need something to control the temp to do that safely.

[www]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Would you guys recommend using all the replacement caps from the same brand (and series) or that doesn't matter?

Because I see on badcaps store that Rubycon 1000uF 6.3v are not available anymore (and theres a link for rubycon 1000uF 10v instead), but Samxon seems to have all the caps I need.

Also what difference the diameter of the caps make? Should I buy the ones that have the same diameter than the caps I want to replace?

I need:

3x 1500uF 6.3v
3x 1000uF 6.3v
2x 470uF 16v

But not sure about the diameter.

[mockingbird]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Take a ruler and measire the width by millimeters. I will check what matches, but I have to find the datasheet for Sacon FZ first.

[mockingbird]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

3x 1500uF 6.3v
3x 1000uF 6.3v
2x 470uF 16v

It seems Samxon GD would be a good match for you. GC's impedence is too low. But I can't find GD in 6.3V 1000uF. Topcat, care to assist this fellow?

Sacon FZ ratings:

[yyonline]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Take a ruler and measire the width by millimeters. I will check what matches, but I have to find the datasheet for Sacon FZ first.

FZ datasheet attached

3x 1500uF 6.3v 10mm D x 12.5mm H, 1800mA ripple, 22mΩ ESR
3x 1000uF 6.3v 8mm D x 12mm H, 1150mA ripple, 36mΩ ESR
2x 470uF 16v 10mm D x 12.5mm H, 1800mA ripple, 22mΩ ESR

The 470uF one is hard to find a replacement for due to its size. I usually end up using a polymer cap for that one. Samxon makes 16V/470uF GA and GC in the right size, but I'm not sure who carries it in that size.

[www]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Ok, I've measured the caps that I need to replace, also found that I need 4x 1500uf, one was "hidden" under a modified cooler I added. So this is what I need:

4x 1500uF 6.3v 10mm
3x 1000uF 6.3v 8mm
2x 470uF 16v 8mm

If I can get them shipped to my country I'd like to buy them here at badcaps.net, so this is what I found in the badcaps store:

Rubycon 1500uF 6.3v 10mm MCZ Series
Rubycon 1500uF 6.3v 10mm ZL Series

Rubycon 1000uF 10v 8mm MCZ Series - Recommended by badcaps for replacement of Rubycon 1000uF 6.3v 8mm MBZ Series
Samxon 1000uF 6.3v 8mm GC Series - this one has the exact voltage but it's GC series which mockingbird said has too low impedence.

Rubycon 470uF 16v 8mm MBZ Series
Samxon 470uF 16v 8mm GD Series

So it looks like rubycon has all the caps I need except that the 1000uF has a different voltage.

Would you guys recommend using all the rubycon MCZ & MBZ series even when the 1000uF has a different voltage?

And for the 470uF, should I go with Rubycon so I get all from the same brand or would the Samxon GD series work well too mixed with the others from Rubycon?

[yyonline]

Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Rubycon 1500uF 6.3v 10mm MCZ Series
Rubycon 1500uF 6.3v 10mm ZL Series

Use the MCZ here. ZL is not low enough ESR.

Rubycon 1000uF 10v 8mm MCZ Series - Recommended by badcaps for replacement of Rubycon 1000uF 6.3v 8mm MBZ Series
Samxon 1000uF 6.3v 8mm GC Series - this one has the exact voltage but it's GC series which mockingbird said has too low impedence.

Either one works here. Note that the MCZ is taller than the original cap. At 14mm, it may rub the back of the card in the adjacent slot. Get the GC, which is 12mm high, if that is an issue.

GC is lower impedance/ESR than the original, but MCZ is even lower. Generally, lower is better. Either should work just fine as a replacement, but mind the size as mentioned.

Rubycon 470uF 16v 8mm MBZ Series
Samxon 470uF 16v 8mm GD Series

The two options here are equivalent as far as specifications go. Rubycon is more highly regarded, but both are reliable. That said...

This one is tricky. Neither one of these is low enough ESR/high enough ripple to replace the original FZ. GD/MBZ in that size is 1140mA ripple, 36mΩ ESR. You need 1800mA or more ripple, 22mΩ or less ESR. Badcaps.net doesn't carry anything that fits the bill here. I usually replace 16V 470uF FZ with a polymer cap when I encounter it.

(Side note: Perhaps Topcat wants to consider carrying the 10x12mm 16V 470uF Samxon GC? At 1760mA, it's only 2% less than FZ, and I sort of doubt FZ performed at its specs anyway. He'd have the market cornered here, as I can't find suitable replacements for it anywhere aside from polymer.)

So it looks like rubycon has all the caps I need except that the 1000uF has a different voltage.

The voltage is a limit, not a value. So the cap can handle up to X volts. If the original is 6.3V, you can use 10V no problem.

And for the 470uF, should I go with Rubycon so I get all from the same brand or would the Samxon GD series work well too mixed with the others from Rubycon?

Mixing brands is not an issue. Manufacturers do it all the time straight from the factory.

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Re: Replaced 2 fz79 with trec GR in Zotac 8600GT but still doesnt work.

Thanks for the great reply yyonline. I'll contact Topcat to see if he can help me out with the 470uF, or will see if I can get it somewhere else.