Greetings and Salutations!
I have encountered a faulty GPU — an Inno3D RTX 2070 Twin. There was a shorted MOSFET on the Vcore rail.
The faulty DrMOS was removed, and the burned PCB area was milled away.
All voltages are now good, but the GPU is not being detected.
I found that the CS pin of the BIOS (GPU) is not being pulled low, and thus, the GPU isn't detected.
I wanted to measure the SM_Data and SM_Clock, but to my surprise, there is no connection at all.
I thought these pins were used for communication during startup?!?
On all the other cards I have on hand right now and have inspected, there is indeed a connection—either through some vias or traces on the board.
However, the GPU I am working on right now doesn't seem to be using these pins at all.
What is going on here?
Is detection being done through the first PCIe lanes on modern cards?
Any explanation or help in figuring out the fault and working principle of the card would be greatly appreciated!
I have encountered a faulty GPU — an Inno3D RTX 2070 Twin. There was a shorted MOSFET on the Vcore rail.
The faulty DrMOS was removed, and the burned PCB area was milled away.
All voltages are now good, but the GPU is not being detected.
I found that the CS pin of the BIOS (GPU) is not being pulled low, and thus, the GPU isn't detected.
I wanted to measure the SM_Data and SM_Clock, but to my surprise, there is no connection at all.
I thought these pins were used for communication during startup?!?
On all the other cards I have on hand right now and have inspected, there is indeed a connection—either through some vias or traces on the board.
However, the GPU I am working on right now doesn't seem to be using these pins at all.
What is going on here?
Is detection being done through the first PCIe lanes on modern cards?
Any explanation or help in figuring out the fault and working principle of the card would be greatly appreciated!