Random shutdown of high bandwidth DVI displays due to poor grounding

Yeah, that’s a long title but it says it all.

I’m not an electrical engineer and what i discuss here was an interesting learning experience, at the cost of customer satisfaction – on what happened to be something due to customer’s electrical installation fault.

Comments are appreciated. It’s always awesome to learn something from the community.

A large videowall was commissioned a few months ago. It’s a very typical installation without much to it – 5×3 configuration, each display is FullHD. Issue was simple by itself: from time to time (sometimes per hour, a few times a day… depends on.. stuff?), each of the splitters would randomly lose input signal. Catch: only a few of them would not display any symptoms and nothing was at all obvious.

TL;DR: it was the UPS’ fault!

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