Gateway MA3 (MX6426) DC jack PCB short

[golemmaster]

There seems to be a dead short between the throughhole (+19VDC) and neutral/ground plane somewhere on or in the PCB. On one side there is a PC127 and PL13 and the other side has PC2 and PL2. If I interpret this right, they are Power Capacitors and Power (L)Inductors.
Either one or both capacitors are shorted or there is a short inside the PCB on another layer.
If this SM capacitor would short I think I'd see some discoloration, yeah?
It might be an internal short but I can't test/prove or fix that I don't think....but maybe I'm being pessimistic.
Noob question: What's the use of these tiny value capacitors bridging the + an - pads?

What do you think?
What's my next step?

Here's a couple pics....
The jack has been removed and solderpads and vias cleaned up.
On the second pic you can see a scorch mark and slight disturbance on the round pin pad.

[kc8adu]

Re: Gateway MA3 (MX6426) DC jack PCB short

first suspects are pc2 and pc127.
the pl's are inductors.
i have repaired several of these and found mlcc shorts in several areas.

[golemmaster]

Re: Gateway MA3 (MX6426) DC jack PCB short

I removed the capacitors and they aren't shorted. The board is still shorted. Must be further down the line....but it could be anywhere. I don't now how to test without popping bunches of components off. If there was a way of isolating that section of the board, that would be something to work with.

What's next?

[golemmaster]

Re: Gateway MA3 (MX6426) DC jack PCB short

I don't know if matters a hill of beans but I notice that when I measure resistance between the shorted pin and the ground plane anywhere on the board it's always 6.5 Ohms. When doing the same between grounds anywhere it will of course be low but will vary about .1, .2 Ohms.
I was just wondering if there was a way to see how far away from the pin the short might be. I might be spinning my wheels.

[Wizard]

Re: Gateway MA3 (MX6426) DC jack PCB short

are you certain this is not the socket itself?

Cheers, Wizard

[golemmaster]

Re: Gateway MA3 (MX6426) DC jack PCB short

are you certain this is not the socket itself?

Cheers, Wizard

When I say "pin" I mean the round hole/pad/via that would receive the pin (+19VDC) on the socket/jack. The socket has been removed. See first post and pics.