Short to ground

[newtothis]

OK so haven't really dealt with many shorts so wondering if someone can explain a couple of things.

Have a board which I am guessing has a short to ground... If I attach my black probe to the power input ground and red to a lot of components (both sides and even with component removed both pads) my multimeter beeps to tell me there is continuity.

Is this a short to ground?

[budm]

Re: Short to ground

Power input ground, you mean safety GND or circuit GND, primary circuit or secondary circuit?
Using beep mode, depend on the meter, some will beep with resistance as high as 100 Ohms.
I would use Ohm mode. The dead short is <1 Ohm, other that consider as shorts can be >1 Ohms depends on the circuit. You also have to consider the circuit, for example the output of the power supply may have bleeder resistor, or dummy load to keep the power supply steady when there is no load connected, the value can be 100 Ohms or less depends on the Voltage and how fast they want to discharge the caps.

[newtothis]

Re: Short to ground

Its a graphics card I am dealing with.

Have my black on the pin with blue arrow.
Red any any components in red and blue areas + more give continuous beep.
Components in blue areas will give 0 ohms across them.
Even removing components and checking across their own pads give 0 ohms

[newtothis]

Re: Short to ground

bump

[selldoor]

Re: Short to ground

Blue things are inductors? so should read as short.
Are you sure the pin you refer to is not a ground pin?
Have you tested that pin to say the bracket at the other end.

[newtothis]

Re: Short to ground

PCI-E Connector so all blacks are ground and all yellow are 12v.

But even after removing a component should there be continuity to the ground on both pads?

[selldoor]

Re: Short to ground

By components do you mean inductors (L on board designator) continuity from pads - perhaps but short to ground unlikely as budm says use and quote ohms.

Did you test - pin to bracket?

[newtothis]

Re: Short to ground

Pin to bracket is 0 ohms

Pin to both pads (not inductors) gives 0 ohms

[selldoor]

Re: Short to ground

I may have this wrong but from what I have seen the top four pins are Ground.
Is that pin a top pin ie the edge nearest the clip. Also one of the bottom pins might be a sense pin which is also ground

[newtothis]

Re: Short to ground

Seems it is ground yes

[budm]

Re: Short to ground

I see 7 black filter caps with + symbol on one end, what resistance between the two legs of those caps do get? Any one of them show <1 Ohm?

[newtothis]

Re: Short to ground

By board is slightly different.... Only a 3 of them. All check fine

[budm]

Re: Short to ground

By board is slightly different.... Only a 3 of them. All check fine

OK, you should then upload your board so there will be no confusion on which parts of the board we are trying to locate.

[sasser]

Re: Short to ground

Im also want ask masta here howto check short to ground. Are that means when measure resistance ohm is set to digital multimeter with black probe at gnd and red probe at positif side component? And what value ohm if short? > 1ohm or below or can be zero?