Find a diagram for the EVGA SR-2 or look at the 24-pin power connections.
Find a diagram for the EVGA SR-2 or look at the 24-pin power connections.
Examining the image more closely reveals the bios selection button seems misaligned, and there are signs of impact on the bottom-right corner of the board. While uncommon, such damage can occur, and chewing near that spot might have created additional traces.
There was no indication of distortion or any obvious harm to the board. The components directly removed from it were intended for a design experiment.
A fellow reader who might find this useful: A generous individual has been maintaining an SR-2 for more than ten years, and I’ve received a top-notch photo of it. Even though the model details vary, they all match 560uF at 6.3V. On Digikey I discovered aluminum polymer capacitors with solid and liquid electrolytes, featuring extremely low 7mOhm ESR, which I ordered. Here’s the start!
It seems the issue is due to the absence of certain capacitors. These components handle BIOS transitions and chip management, so their lack might stop the board from functioning properly.
They aren't in charge of switching BIOS. It's part of a voltage regulator, that's the rule. Without capacitors, the regulator might become unstable. The BIOS usually runs on 5V standby; if the switch isn't working, the BIOS won't activate. Make sure the slide switch has at least one connection for a specific BIOS. This board supports three BIOS slots, one of which can be removed for external programming. Look at the diagram below and verify the slide switch—check its pin layout. It seems to match what I think it should, but it might differ. If it matches the picture, there should be a connection between the bottom row and one pin on the top row (the CS/ENABLE pin). BIOS commands are sent by pulling that pin high or low; others stay floating and ignore signals. Try switching to another BIOS—perhaps the issue is with the current one being corrupted or overloaded, which blocks it. Capacitors could definitely be the problem. Also, inspect the battery; if it's been idle too long, it might be discharged.