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Motherboard mounting issue on M8/M10 - Page 2

post #11 of 16
It has always been my understanding the motherboard is grounded through the 24pin psu power cable to the motherboard not the screws. My thinking is if you have a arcylic cas such as a danger den waterbox the standoff's attached to plastic so there is no way they provide any ground on that particular case at all.
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post #12 of 16
the standoff holes do not ground the motherboard you can remove them all and suspend it in the air and it will still work, grounded by the PSU connector.

When i put my px6523352d-e in the case, it didn't post either. But after many painful hours of part swapping, I realized that I couldn't leave the extra unused standoffs in the tray as they were shorting the board out. lol surprisingly I am not the only one who is that stupid.

Using the correct set of the gold standoffs that came in the tray works fine.. there's plenty of clearance. I'm not sure why yours would be any different.
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post #13 of 16
Yes the power cables will ground the motherboard, but that doesn't mean that the screws aren't also connected through the power plane of the motherboard to the cable
     
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post #14 of 16
Thread Starter 
I know it's silly to quote wikipedia, but whoever edited the article has it right on:
http://en.wikipedia.org/wiki/Compute...board_standoff

Quote:
The [brass] standoffs provide an electrical ground connection between the motherboard and case. The standoff provides a margin of space between the motherboard and the case. Without the space, the motherboard would be in physical contact with the case, which would cause it to not function because its various solder points would be in contact with the case's metal, which forms a short circuit with the computer's electrical ground.
The points on the motherboard that make contact with the standoffs connect to ground. If the standoffs contact any other metal on the motherboard, you have a short. If you leave extra standoffs on the tray that do not correspond to a mounting hole on the motherboard, you will have a short.
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post #15 of 16
Quote:
Originally Posted by dober reiner View Post
I know it's silly to quote wikipedia, but whoever edited the article has it right on:
http://en.wikipedia.org/wiki/Compute...board_standoff



The points on the motherboard that make contact with the standoffs connect to ground. If the standoffs contact any other metal on the motherboard, you have a short. If you leave extra standoffs on the tray that do not correspond to a mounting hole on the motherboard, you will have a short.
And that works how when your case is made of acrylic?
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post #16 of 16
Lloyd is correct - the board is grounded through the PSU connector, not the tray assy. The problem arises when there is an unused standoff that bridges two or more solder connections on the bottom of the board creating a short across them.

We put standoffs in all the holes for a couple of reasons: to make sure the standoffs are shipping (and there is enough of them) and second, as a QC check to make sure all the inserts are installed and the threads are good.

Best regards
Edited by Jim-CL - 8/2/11 at 8:15am
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