I've purchased an used, partially damaged card - Gigabyte GTX 660 OC 2GB with twinfrozr fans. I had hope to easily repair it using my experience with electronics. However, the problem with it is bigger than I've initially thought. Allow me to explain:
The card behaves in an unusual way even for a damaged unit.
- Upon booting up it can work for various amounts of time and then stop one of it's fans.
- Temperatures are stable, nothing crazy.
- After some additional time second fan stops and computer reboots without giving any beep signals.
- After that, during initial boot up (bios screen and so on) fans do not begin to run. I am able to see what's on the screen due to the fact that my CPU has an integrated Intel HD 3000 graphics.
- When I run GpuZ and search for my GTX 660, I only see integrated graphics.
- I've checked what actually happened in windows event log manager and if I remember well, the error code was either 41 or 43. It was a critical error that prevented system from operating normally.
- At this moment if I turn off the computer or reboot it - there is a very low chance for GTX 660 to begin working.
- If I wait some time (about 30 minutes since the critical error) then GTX 660 begins to work until same scenario occurs.
- The card itself behaves this way regardless of software running at certain moment. It can be during idle or browsing internet or eventually gaming (battlefield 4)
- When both fans work, one is having problems with keeping up fixed RPMs. It's visible when I point a flashlight on it's blades. Second fan runs smoothly.
- One of the fans makes a slight rubbing/rattling sound.
- Previous owner didn't state when these problems started to occur.
- Previous owner tested this card on Corsair's 750 Watt PSU and much newer components like mobo, CPU etc. He had the same situation.
- Additional power connector is inserted in the GPU.
- Upon disassembling the GPU (taking off the radiator and fans), I've noticed that little black boxes with 'R22' written on them (power coils) are having some dark stains. Stains look like as if someone smeared their matte finish with an oily substance. Upon cleaning with alcohol stains do not color the cotton-wool tip. However, they do disappear upon cleaning.
- All capacitors seem to be ok. These are the japanese type caps that are supposed to be more durable. No burns, stains, or popped heads.
PC SPECS: 1. Mobo - Gigabyte GA-H61m-D2-B3 rev. 1.0 2. CPU - Intel i3-2120 LGA 1155 running 2x 3,3 Ghz 3. GPU - Intel HD 3000/Gigabyte GTX 660 OC 2GB Twinfrozr edition 4. SSD/HDD - 2 SSD + 1 HDD (Samsung, Kingston, Seagate) 5. PSU - Corsair VS 450
Photos of the unit:
Hotlink to gallery :
Question: What is causing this card to fail? What electronic component can interfere with it's normal operation?