mpe wrote on 2021-05-21, 13:23:
Of course they are all interconnected (and between supply voltage and ground). These capacitor don't form any specific circuit. They are decoupling the input voltage to minimise noise. It is important they are as close to the hi-freq part inside the CPU as possible to provide low impedance path.
Bridging one to another won't achieve the purpose these caps are there for.
But might still work (even without any caps) if lucky. Just the CPU might be less stable at times. Particularly when driving the bus.
I didn't know whether there was a split voltage supply within the chip. If it had a couple of supply voltages (say 2.8V and 3.3V) then the capacitors could be decoupling those supplies to ground, and possibly between them. So I thought it would be a good idea to check that before risking connecting two separate supplies together. I agree that jumping across will make the capacitor less effective. It might even cause problems if the designers wanted to inductively separate different areas at the same voltage and directly linking across the capacitors might break that. And yes, they should be as close as possible to whatever is switching, where in this case (what with the pad missing) 'as close as possible' might be via the pad of another capacitor. As I said, likely to be sufficiently far away that the inductance in the wire might effectively make it appear to be missing anyway.
OTOH, I don't think it'd do any harm to replace both the missing caps as best as possible. I've seen designs with small decoupling caps placed a few cm away from the relevant pins, and they still work (might still work without the cap there at all...).
Had a bit more of a skim through Mouser, something like this might do, if the case size is 0508:
https://www.mouser.co.uk/ProductDetail/Murata … 2EdiUX8AQ%3D%3D