If the pads are clean likely there was nothing there in the first place. R51 is a 10 ohm 0603 size resistor so replace that first and take it from there.
I'd also check the pins on the TMU's and FBI are not loose. Use a scalpel blade for that.
Good luck.

R51 needs to be present, it's quite important. Actual value is not that critical, 10-22R should be fine, as it's just a series termination resistor.
For a quick test you can replace it with a blob of solder and see if the card works.

Thanks so much @imperious and @sdz for your help, I'll try get hold of a replacement resistor to fix it. Quick (and potentially dumb) question: I dont know much about resistors - is a 10r resistor 10Ω or 10kΩ or what? I am seeing 10kΩ on various sites in this size, but 10Ω seems like a very low value..

10R is 10Ω. Though, on your particular card, that resistor was likely 22R. Then again, the exact value is not critical in this case.

okay great, so something like this would work:

https://www.mantech.co.za/productinfo.aspx?item=35M5286

Yes, that will work.

Thanks so much Sdz!

Just an update on this, and hoping to get some more help..

I replaced resisitor 51 with the correct part - didnt make any difference to mojo's diagnostic results.. so I poked around a bit more and found 1 resistor on RA9 that was open circuit, so I replaced the array with a suitable replacement and confirmed that all the connections through the array are now good, but again no change to mojo's result.. I have also been browsing this and other forums trying to find if anyone has been able to fix the "0xdead" TMU error I have and it doesnt look hopeful.. all of those threads tend to go quiet with no-one posting a successful repair. So my questions at this point basically are:

Does anyone have an idea where I should look next with diagnosing this card? I was thinking trying to check if the TMU is getting power, but not sure which pin on the TMU is power?
And has anyone done(or know of) a successful repair on a voodoo card with a "0xdead" message? I'm beginning to think that maybe "0xdead" does actually mean the TMU is dead?

TMU power pins are: 15 27 31 43 58 73 78 96 109 116 128 140 143 153 163 173 183 187 203
The RAMDAC should provide a clock to the TMU, you can check TMU pin 186 if you have an oscilloscope. You could also check TMU pin 208, RESET. This should be directly connected to FBI pin 197.
Also, gently poke all the FBI and TMU pins and see if they're actually soldered. This is really important to check, although they may look fine, they can be detached from the PCB.

Thanks for that sdz! How do I know which pins are which though? is there a diagram or something?

Count from pin 1, it's marked on the ICs with a little circle, and on the silkscreen as well.

I'd take a look at the right TMU. 2 Pins about number 194 look like they are shorted, but it coud just be a speck of dust.

Hi all. So I tried to test the voodoo with a friend's oscilloscope, but I don't really know how to use one.. I did manage to get it to show some signal next to the crystal and also in a few places (like R153,R154,R155). I also thought I spotted a clock signal around pin 186 on TMU 0, but it didn't seem to also be there on TMU 1.. so that is probably the issue. I also noticed this: I saw someone else on vogons testing the capacitance here :

But on my card it only goes to to 50k or so ohms, but I think this is meant to go up to 300, right?

Capacitors can not be measured in circuit...