This bent thing near D200 "C3 05 T" is the same SMD transistor as D200 and it's there, just slightly desoldered. Try to resolder it on its proper position. If it does not work - change it. Just search and find suitable SMD replacment for C3 05 T.

Yeah, this is my problem. I can’t find anything about this “C3 05 t” part.

I don’t know how to decode it, and I can’t find any really useful reference to it online.

I’m fully willing to accept that I’m a complete idiot and that the answer is right in front of my face, but right now I can’t find anything useful.

You're right, without circuit diagram there's no easy way to find info for this obsolete missing SMD component "C3 05 T" on the internet. My best guess is it's SOT23 formfactor (you can check this by element's physical dimensions) and there are some possibilities to be double diode, VRM or MOSFET/transistor. Assume that "T" is for transistor/MOSFET, but it is not guarantee for sure.

What would I have done in this case? i would desolder one of the other "healthy looking" C3 05 T and test it with component/transistor tester (for example some cheap LCR-T4) - this will give the type and basic parameters of the component. Once I know for sure if it is a MOSFET or something else, by the measured parameters I will look for the closest substitute/analogue.

The missing capacitor may not be fatal if it is decoupling capacitor - the card should work without it. Check if one of the missing cap's pads is shorted to ground. If it is so, it will be very likely to be a decoupling capacitor and it is OK to just skip it for now.

Those are diodes, for transients on the VGA interface. The card will work without them.

Okay, thanks for the info.

I used a meter on the pads of the missing capacitor, and yes, one of them goes to ground.

So, if neither of these components are strictly necessary, I guess it's back to the drawing board to figure out my issues.

Thanks guys.

No idea or opinion about the 3-legged component.
As far as the capacitor - as was mentioned it's probably not critical. Desoldering and measuring another one is problematic because you reach a point where you're measuring your own equipment more than the device. These capacitors are so small that it's not easy to accurately measure them.
If you want to replace it with something, you might get away with just finding near to the largest capacitance value ceramic capacitor that fits in that physical footprint, with say a 50V rating (ceramic caps derate badly when operated near their rated maximum voltage, there are different grades for how badly they do that).

shamino wrote on 2023-07-10, 00:04:

These capacitors are so small that it's not easy to accurately measure them.

For measurements of very small SMD components I use these

and a piece of scotch tape to hold desoldered miniature component.