Core i7 short to ground, possible cause?

[hgg]

Re: Core i7 short to ground, possible cause?

That's what I mean.
This line is shorted to ground and either the CPU or the VT357 is creating the short.

[caspian]

Re: Core i7 short to ground, possible cause?

check which third component is parallel on that line. That third component may be shorted.

[hgg]

Re: Core i7 short to ground, possible cause?

Which 3rd component? There are a lot on this line!

There is the DC-DC converter VT357 and it has its input shorted with its output.
Is it possible that this is what is creating the problem?

[caspian]

Re: Core i7 short to ground, possible cause?

yes it is possible, but not so probable.
first check whether a parallel capacitor or mosfet is shorting the input and the output of VT357.

[hgg]

Re: Core i7 short to ground, possible cause?

The output of VT357 has been completely disconnected because I removed L30.

[caspian]

Re: Core i7 short to ground, possible cause?

now remove VT357 to check whether the short gets gone or not.

[hgg]

Re: Core i7 short to ground, possible cause?

Hmm, yes, that's what I want to avoid because its a 25 pin BGA 2x2mm in size..
I guess I have no other choice though.

[caspian]

Re: Core i7 short to ground, possible cause?

you need a powerful soldering microscope and a lot of care.

[hgg]

Re: Core i7 short to ground, possible cause?

I have this one but its nothing near what you should have for the job...
https://www.amazon.com/Opti-Tekscope.../dp/B00PEZ3GMK

[caspian]

Re: Core i7 short to ground, possible cause?

it provides a small working space under the camera.
so the camera may be damaged by the heat you apply to the board.
If I get rich some day, I will buy an AmScope.

[hgg]

Re: Core i7 short to ground, possible cause?

Yes indeed, that's what I have in mind as well.

[Biswash]

Re: Core i7 short to ground, possible cause?

i need bios of lenovo v110