Lenovo T480s completely dead

[Andreasbest]

Re: Lenovo T480s completely dead

Desoldered them both, 5Ω remained on their common side, the other side received hi resistance.
Next? PR101?

[khaahk]

Re: Lenovo T480s completely dead

yes

[Andreasbest]

Re: Lenovo T480s completely dead

Which one of these two is the PR101?
I suspect is the large black SMD labelled as R010?

[khaahk]

Re: Lenovo T480s completely dead

This is it.

[Andreasbest]

Re: Lenovo T480s completely dead

Ok, desolder the PR101 and the resistance on side of PQ101 is high, the other side remained on 7Ω.

[khaahk]

Re: Lenovo T480s completely dead

Which side remained low resistance? Inject 1V and 500mA into the low ohm side and look for heat, increase voltage slowly, also current until you find the heat source.

[Andreasbest]

Re: Lenovo T480s completely dead

Not the side that is directly connected to PQ101, the other remained low.
Injection with PR101 removed or soldered?

[khaahk]

Re: Lenovo T480s completely dead

No point in putting it back

[Andreasbest]

Re: Lenovo T480s completely dead

Ok, so i apply voltage with red probe (+) on the side of PR101 with low resistance and the black (-) on GND?
I know but just to confirm.

[khaahk]

Re: Lenovo T480s completely dead

correct

[Andreasbest]

Re: Lenovo T480s completely dead

Ok i found the guilty, the capacitor on the picture is shorted.
Desolder it and the resistance on rail returned to several MΩ
Now should i replace it or not?

[khaahk]

Re: Lenovo T480s completely dead

You can test without it, but should be replaced to be sure.

[Andreasbest]

Re: Lenovo T480s completely dead

Already assemble it and working fine with one capacitor. All good, thank you very much, really appreciated!
When you visit Greece pm me, the beers on me

[khaahk]

Re: Lenovo T480s completely dead

It will probably work fine without it, but if you do it as service for client it is best to replace it. As part of professional ethics.
Good job!

[Andreasbest]

Re: Lenovo T480s completely dead

I will probably do, what is the value of it?

[khaahk]

Re: Lenovo T480s completely dead

You have a boardview at the end of schematic, its PC6.