Thanks very much for your help, I certainly would not have considered that the X designates a component not to be fitted without your comment. Looking over the schematic and the actual board there are a number of other components marked with the X that are not populated which also agree with your comment above. Some look to provide an option for either GND or power to an input so definitely makes sense only one of the components would be in place.

It took me a little while but I finally managed to get the correct ferrite beads and installed just the one on CKA_FB2. I applied power...

Hi from Perth in West Australia.

Bit of a newbie here, I have a background in electronics but have been working in power systems for years. Now I am looking to do more in electronics as it is what I like best. At the moment I am repairing motherboards just for enjoyment. Current projects include an Aorus Z490 Elite AC, an MSI B550 Tomahawk on it's way to me with unknown faults, an ISA-386U3PQ (80386 machine) and a few others. I am finding the more you do the easier it gets.

It is great to see forums where people can talk about issues and perhaps offer some knowledge....

Thanks for the help.

The pads aren't clean and when you add it to boardview and schematic which both indicated components should be fitted, I think in both cases something was lost. Rechecking the voltages with the board powered I see VCC3 is at 3.3V and 3VDual is also 3.3V, CKVDD & CKVDDA are around 1V (not as I stated before). VCC3 is directly fed from the ATX PSU so it makes sense that that is the primary 3.3V supply. I think a ferrite bead on the incoming 3.3V supply makes a lot more sense than an inductor. Thanks for the idea.

Cheers...

Hello all.

I am trying to repair a Gigabyte Z490 Aorus Elite AC motherboard that was roughly handled. It had some components ripped off the bottom of the board. The last two I am trying to replace are shown as CKA_FB1 and CKA_FB2 on the schematic and I think they are SMD 0402 30nH inductors to control the resonant impedance of the control rails. I have measured approximately 3.3VDC at CKVDD as per image below. On the board the still in place CKA_FB3 is 1mm x 0.5mm SMD component with a dark body.

I am not familiar with the symbols used in the schematic below if anyone...