Elitebook 8470p 3v line short?

[usyusy]

If 3v line is short in output, injecting upto 2v/3A (PAD6100) shows on dc supply 1.0A consumption, but nothing heatup what could be the reason?
(Hp Elitebook 8470p board and processor was removed before injecting)

[caspian]

Re: Elitebook 8470p 3v line short?

Does the PCH get hot?
If you do not find the hot component, it is probably a small component.

[DanielDacko]

Re: Elitebook 8470p 3v line short?

Inject 3V freely, something must get hot after a while. Suspects are Q6100, Q6101 and U6100, but can be something else tbh.

[Udemzy]

Re: Elitebook 8470p 3v line short?

2v is small increase it gradually.

But first check if it is input or output short but lifting one side of the coil or removing the pad that connects that section.

[usyusy]

Re: Elitebook 8470p 3v line short?

Does the PCH get hot?
If you do not find the hot component, it is probably a small component.

no sir, no PCH or IO got hot.

[mcplslg123]

Re: Elitebook 8470p 3v line short?

Did any component burnt on the mb causing this short??

[usyusy]

Re: Elitebook 8470p 3v line short?

Sir, apparently no such component seems to be

[mon2]

Re: Elitebook 8470p 3v line short?

Remove all power. Meter in lowest resistance scale.

What is the resistance to ground of this 3v scale?

Where are you measuring exactly?

[usyusy]

Re: Elitebook 8470p 3v line short?

Resistance to ground is 1.5 ohm, and testing on output side of 3v line
Measuring on L6100 and PAD6100

[mon2]

Re: Elitebook 8470p 3v line short?

You have a short on this power rail.

Lift up one leg of the inductor L6100. After one leg is lifted, measure the resistance to ground again @ PAD6100.

What is the resistance to ground ? We want to determine if the short is on the downstream (consumer) side or the producer (L6100, pin #2) = U6100 side.

Confirm also the resistance to ground @ L6100, pin # 2 = U6100 side after the inductor leg is lifted.