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pc motherboard grounds

Started by John Larkin August 25, 2012
On 25 Aug., 19:17, Joerg <inva...@invalid.invalid> wrote:
> John Larkin wrote: > > > The mounting holes on PC motherboards: are they usually connected to > > the PCB ground plane? > > I have seen both, probably best to take a look at the board you've got. > For example, this one appears to be heavily via'd to GND as I believe it > should be: > > http://imageshack.us/photo/my-images/195/inteldp35dpoxidation07.jpg/ >
hard to tell from the pic but I think it looks like there is isolation around the pad so it doesn't connect to the top layer, might not connect internally either -Lasse
John Larkin Inscribed thus:

> > > The mounting holes on PC motherboards: are they usually connected to > the PCB ground plane? >
Yes, always ! Also don't use fibre washers under the screw heads. -- Best Regards: Baron.
John Larkin wrote:
> > The mounting holes on PC motherboards: are they usually connected to > the PCB ground plane? >
Almost never IME. I constantly have to argue folks into doing it. Some have alternative approaches, e.g. a non-plated mounting hole surrounded by a wide pad containing a whole bunch of ground vias. That allegedly prevents the screw from damaging the plating. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
Phil Hobbs wrote:
> > John Larkin wrote: > > > > The mounting holes on PC motherboards: are they usually connected to > > the PCB ground plane? > > > > Almost never IME. I constantly have to argue folks into doing it. Some > have alternative approaches, e.g. a non-plated mounting hole surrounded > by a wide pad containing a whole bunch of ground vias. That allegedly > prevents the screw from damaging the plating. >
(Folks doing other sorts of boards, I mean.0 Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
On Sat, 25 Aug 2012 09:34:54 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

> > >The mounting holes on PC motherboards: are they usually connected to >the PCB ground plane?
Usually, but not always! John Ferrell W8CCW
On Saturday, August 25, 2012 9:34:54 AM UTC-7, John Larkin wrote:
> The mounting holes on PC motherboards: are they usually connected to > > the PCB ground plane?
Examine the hole; the ones with 'stitched' multiple PTH around 'em are good grounds. Plated-through-hole with a mounting screw through it might get the in-hole plating damaged, so the connection to the inner vias is not otherwise reliable. Unreliable or not, it's common practice to snap a plastic button into many (or most) of the mounting holes, and slide the buttons into slots, with only one or two mount holes (the ones near the external connectors) actually having conductive fastening hardware.
On Sat, 25 Aug 2012 10:00:51 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

> >I have never assembled my own house, car, refrigerator, TV, or PC. I >buy them all done and tested. I have more than enough electronics of >my own to design. >
Your brilliance escapes any observation. Must all be super secret stuff. I'll simplify the question for you, Mr. Electronics. How could you ever think that it would be isolated?
On Sat, 25 Aug 2012 10:17:25 -0700, Joerg <invalid@invalid.invalid>
wrote:

> >I have seen both,
Bullshit. You could not name even a single MOBO that has isolated mount holes. It world fail to comply with the spec, and no maker ever took that chance. You are a liar. You have NOT "seen both".
On Sat, 25 Aug 2012 10:35:27 -0700 (PDT), "langwadt@fonz.dk"
<langwadt@fonz.dk> wrote:

>On 25 Aug., 19:17, Joerg <inva...@invalid.invalid> wrote: >> John Larkin wrote: >> >> > The mounting holes on PC motherboards: are they usually connected to >> > the PCB ground plane? >> >> I have seen both, probably best to take a look at the board you've got. >> For example, this one appears to be heavily via'd to GND as I believe it >> should be: >> >> http://imageshack.us/photo/my-images/195/inteldp35dpoxidation07.jpg/ >> > >hard to tell from the pic but I think it looks like there is isolation >around >the pad so it doesn't connect to the top layer, might not connect >internally >either > >-Lasse
I cannot believe you fuckers are so fucking lost.
On Sat, 25 Aug 2012 15:13:40 -0400, John Ferrell <W8CCW@arrl.net> wrote:

>On Sat, 25 Aug 2012 09:34:54 -0700, John Larkin ><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: > >> >> >>The mounting holes on PC motherboards: are they usually connected to >>the PCB ground plane? >Usually, but not always! >John Ferrell W8CCW
Of course they ALL are, idiot. It is called a standard, and you ain't bright enough to know that the makers had to follow one? How did you ever get a license to use radios?