G5- NVIDIA GEFORCE 6800 - HELP

[pmac0973]

My Nvidia GeForce 6800 stopped working. G5 powers, chimes and the graphics card Fan spins but no mouse or keyboard power or video. Anyone know on how to troubleshoot the 6800?
Currently using ATI 9600 to keep the G5 running

Thanks

 

[TzunamiOSX]

Mabe defective capacitors. Repairing GPUs is nearly impossible. Did you have a second Mac for remote the desktop?

 

[pmac0973]

Mabe defective capacitors. Repairing GPUs is nearly impossible. Did you have a second Mac for remote the desktop?

darn, thats what I thought. I can remote to it but I'm using my ATI card for now

 

[TzunamiOSX]

Check the computer starts up to Leo/Tiger, per remote.

If the remote is sluggish the system runs headless.

If not look in „About this Mac“ an check under Monitor. Perhaps it is only a simple problem.

The 9600 is much slower.

 

[pmac0973]

Check the computer starts up to Leo/Tiger, per remote.

If the remote is sluggish the system runs headless.

If not look in „About this Mac“ an check under Monitor. Perhaps it is only a simple problem.

The 9600 is much slower.

thanks, will check tonight

 

[pmac0973]

No go. Does not completely boot. Fans go full blast after 3 to 5 minutes.

Thanks for all the tips

 

[ediflorianus]

could be from a blown VRM (voltage-regulating-module-next to the GPU)
First things first. Try it on a PC , next>
Clean it well , use dry contact cleaner.
Put new special GPU paste (not to much)
Test. (preferably on PC first)
if you wish , pre-heat the card with a hair dryer (wont do more damidge at 50-75cm far).
if you have a volt meter, try getting schismatics from online and measuring stuff on it.
If all else fails , can try cleaning with WD40+brake disk cleaner (but as last restort)

P.S. Not impossible to repair , but hard to identify exact problem.

 

[pmac0973]

could be from a blown VRM (voltage-regulating-module-next to the GPU)
First things first. Try it on a PC , next>
Clean it well , use dry contact cleaner.
Put new special GPU paste (not to much)
Test. (preferably on PC first)
if you wish , pre-heat the card with a hair dryer (wont do more damidge at 50-75cm far).
if you have a volt meter, try getting schismatics from online and measuring stuff on it.
If all else fails , can try cleaning with WD40+brake disk cleaner (but as last restort)

P.S. Not impossible to repair , but hard to identify exact problem.

Thanks, will try it this weekend

 

[pmac0973]

Thanks, will try it this weekend

No go

 

[TheShortTimer]

First things first. Try it on a PC , next>
Clean it well , use dry contact cleaner.
Put new special GPU paste (not to much)
Test. (preferably on PC first)

The Nvidia GeForce 6800 Ultra is designed for a PPC Mac and cannot be tested with a PC unless it's flashed first, after which you'd then have to re-flash it to restore PPC Mac compatibility...

 

[ediflorianus]

oh so its a Ultra.... I have mistaken it for a stock one flashed to work. not sure about schematics regarding the large mac edition card.... is it AGP right? probably a defective VRM... tried resetting the whole system after mounting the card? and of course won^t start in (shift_pressed) mode.... so it play the start up sound... that's bizarre... not booting in option_pressed mode? or from a CD/ I have service disks for apple.. if only it would start... from a mac disk...