capacitor near processor

[jackbtw]

Guys want to ask, is it normal on notebook mainboard that SMD tantalum capacitor near processor short when processor is on socket and open on processor off socket?
Do desktop mainboard acting like this too?

[Th3_uN1Qu3]

Re: capacitor near processor

Yes. The CPU is confusing your meter.

[jackbtw]

Re: capacitor near processor

why the caps acting like short, it was decoupling caps, right?
how can cpu confuse the meter?

[momaka]

Re: capacitor near processor

Some CPUs have very low resistance and will read all the way down to a few ohms only, others more. Because the decoupling/filtering caps are connected in parallel with the CPU, you will also measure the CPU resistance when you try to measure any of those caps.

[severach]

Re: capacitor near processor

Desktop processors cause the same measurement confusion. Modern north bridges often have a very low resistance that look like a short too though not nearly as low as a processor.

Most meters in the diode scale can distinguish between a short and a processor or north bridge that is almost a short. If yours can't then try others until you find one that does.