Slipknot
10-07-2005, 09:43 AM
Hello
First: Sorry for my bad english^^. :(
Second: I damaged my 7800GTX while starting my PC yesterday. I soldered the Vcore-mod only and then i tested the mod. It runs w/o any problems.
Then, i applied the Vdimm-mod. The ground-point-connection (for the 200Ohm-trimmer) was very weak. It was so weak, that the 200Ohm-trimmer disconneced from the ground point after few seconds i startet my PC. I used the metal-ring (the ring, where the screws are beeing sticked trough) as a groundpint cause i damaged the original ground-point.
I turned on my PC, and after few second i heard some noise (The trimmer was connected after build-in): It was like an old wooden door in motion, but not so loud. Then, i recocnized that the ground-point-connection was disconnected and i fealt warm air coming from my 78000GTX. As i moved my finger to turn off the PC, it turned of "automatically". I touched the Zalman VF-700 (Heatsink) and the Mosfet-Heatsink. Both were very hot^^. Within seconds, maybe 10-15 seconds, the 7800GTX became very hot^^. I tried to turn on my PC, but there was no reaction, nor the HDDs moved, nor the fans moved, nor anything. W/o the 7800GTX, my PC started as usual.
Within these 10-15s i was able to meassure Vdimm and Vcore: Vdimm was at 2,186V (about 80kOhm) and Vcore was at 1,5XYV (about 160Ohm)
So i removed all solder from the 7800GTX which was applied by me and went to my local dealer. I told him something about blabla, but not about my solder-action^^. He believed me, and gave to me a new 7800GTX^^ (warranty)... Now, i dont know if i should apply the mod again^^
Is it possible, that the (sudden) disconnection from the groung-point is a reason for the increased heat? Or is it the damaged original ground-point?
First: Sorry for my bad english^^. :(
Second: I damaged my 7800GTX while starting my PC yesterday. I soldered the Vcore-mod only and then i tested the mod. It runs w/o any problems.
Then, i applied the Vdimm-mod. The ground-point-connection (for the 200Ohm-trimmer) was very weak. It was so weak, that the 200Ohm-trimmer disconneced from the ground point after few seconds i startet my PC. I used the metal-ring (the ring, where the screws are beeing sticked trough) as a groundpint cause i damaged the original ground-point.
I turned on my PC, and after few second i heard some noise (The trimmer was connected after build-in): It was like an old wooden door in motion, but not so loud. Then, i recocnized that the ground-point-connection was disconnected and i fealt warm air coming from my 78000GTX. As i moved my finger to turn off the PC, it turned of "automatically". I touched the Zalman VF-700 (Heatsink) and the Mosfet-Heatsink. Both were very hot^^. Within seconds, maybe 10-15 seconds, the 7800GTX became very hot^^. I tried to turn on my PC, but there was no reaction, nor the HDDs moved, nor the fans moved, nor anything. W/o the 7800GTX, my PC started as usual.
Within these 10-15s i was able to meassure Vdimm and Vcore: Vdimm was at 2,186V (about 80kOhm) and Vcore was at 1,5XYV (about 160Ohm)
So i removed all solder from the 7800GTX which was applied by me and went to my local dealer. I told him something about blabla, but not about my solder-action^^. He believed me, and gave to me a new 7800GTX^^ (warranty)... Now, i dont know if i should apply the mod again^^
Is it possible, that the (sudden) disconnection from the groung-point is a reason for the increased heat? Or is it the damaged original ground-point?