Input Jack - 19v. But out the connector is 0.4v?

[Bittenfleax]

Getting into the electronics scene here. So, when measuring an output jack (from a charger for example) I get 19v. But when I connect it to the connector the 3 outputs only get around 0.4/0.5v each. Image:

So out of 6, 7 and 8 there is only 0.4v and this is DIRECTLY from the adapter which has a 19v output. However, I noticed something is shorting the power supply (on the board I am testing) because the adapter LED goes off as soon as I plug it in (well I am 99% sure it is because of a short because on other appliances the adapter is fine).

Anyway, could this be because of a short? Or could it be something completely different on the other end of the 6, 7 and 8 pins? - Thanks

 

[dorke]

It could be a short.
It could also be too much current drown by the board ,is the charger the "original" one?

 

[GPG]

Need a lot more info.

 

[Bittenfleax]

It could be a short.
It could also be too much current drown by the board ,is the charger the "original" one?

Yeah.

Need a lot more info.

Oh right, my bad. What do you need? I mean, could it just be a chip causing this? Could it just be 1 single component? I am not trying to find the short yet, I am just trying to figure out what it could be. But from my understanding it could be almost any component right?

 

[dorke]

Yes could be any component.

What is the "board ?
What is the adapter or charger.
can you give brand and model?

please take good photos and post them.

 

[Bittenfleax]

Yes could be any component.

What is the "board ?
What is the adapter or charger.
can you give brand and model?

please take good photos and post them.

Well, it was more of a question asking "Can a short make only a 0.4v output. And why?" kind of thing. I updated original post.

 

[Bittenfleax]

Well, it was more of a question asking "Can a short make only a 0.4v output. And why?" kind of thing. I updated original post.

Realized I cannot edit. Or can I?

Anyway, the question for people is:
Can a short create a 0.4v output instead of a 19v? And why?

 

[(*steve*)]

The basic answer is yes.

A dead short will give you 0V, but an overload caused by a low resistance often caused the voltage to drop. Depending on the nature of the short and the characteristics of your power supply, 0.4V is not particularly unexpected or unusual.