Gigabyte Windforce R9 290X GV-R929XOC-4GD

Seller Note “Gigabyte Windforce N770 OC: Not working, for parts only. No any idea what is wrong”

Summary

  • Seller is either mistaken or lying! On inspection of the board this is not a Gigabyte Windforce N770 OC, but instead one of these https://www.gigabyte.com/Graphics-Card/GV-R929XOC-4GD#ov
  • Screws in bad condition, some missing evidence of being dismantled in a stupid rough handed way! Luckily cheapish, but not a good start in analysis..
  • Thermal pads in very poor condition, dirty.
  • Fan PCB header quite loose.
  • Well, can’t say I’m entirely shocked to find a lack of voltages on the card, only 12v, 3.3v.
  • The screen is of course blank as the card is missing all voltage rails as far as I could tell on quick inspection.
  • Still, didn’t find any obvious shorts and the main resistances seemed in range, so perhaps there is hope yet.
  • Would like to start tracing the power rails and investigating any scematics I can find.
  • Signs of attempted repair / removal which could explain why there is no power. Need a schematic, probably a fuse, guess masking some worse problem (see pictures below).

Pre Checks / Multimeter Only

Test / ChecksResultNotes
1. Visual Inspection Eye / Magnifying GlassMissing 2 screws of the 4 normally securing the GPU heatsink. One of the 2 remaining screws was stripped.
2. Visual Inspection MicroscopeUnder microscope noticed the missing fuse shown below. Didn’t see any other component.
3. Check for shorts on 12v PCI, 12v PCI-E, 3.3v
4a. Resistance VCore (~0.5)~2.4Ω
4b. Resistance VMem (~60Ω)~155Ω
4c. Resistance 3.3v Rail (~960Ω+)
4d. Resistance 5v Rail (~5KΩ)
4e. Resistance 1v PEX Rail (~123Ω+)
4f. Resistance 12v BUS (14.7kΩ )
4g. Resistance 1.8v Rail Ω

Power On / Test Rig Checks

Tests / ChecksResultNotes
1. Observations (e.g. PCB heat noticed,
blank screen, power light on monitor,
bios screen, o/s loaded, artefacts, )
The PCI express power is missing due to a missing fuse, no power rails up.
2. Voltage VCore (~0.88v)~0v
3. Voltage VMem (~1.4v)~0v
4. Voltage PEX Rail (~1v)
5. Voltage 3.3 BUS
6. Voltage 12 ExtN/A
6. Voltage 5v Rail
7. Voltage 1.8v Railv

PCB Missing Component / Damage

Here is the missing component area:

R9 290X Missing Fuse

I don’t have a schematic, but a fuse can be seen in this position from a marketing photo:

Windforce R9 290X Fuse

Worse still, it appears some kind of PCB repair has been attempted:

  • Could be pads were damaged / replaced, outline visible of new pads appear visible.
  • Area is sticky and patterned, perhaps solder mask to cover the repair attempt?
  • No continuity from the fuse output pad to capacitors that I expect to get 12v – guess this means the traces are damaged and the attempted repair failed.

Furthermore, there is a shorted capacitor nearby (C1326) shown below:

R9 290X Shorted Capacitor

Thoughts at this stage

  • Must have been a reason for the blown fuse e.g. short somewhere – maybe that capacitor (optomistic!)
  • Probably need to clean that area back to understand why there is no continuity.
  • Possibly the damage is much more extensive.
  • An accurate schema would be helpful.