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LED Sign Display Driver Glitch

Spotted this while walking out for supper after a day at the CNC Workshop:

Motel LED sign glitch - 1

Motel LED sign glitch – 1

Then it got worse:

Motel LED sign glitch - 2

Motel LED sign glitch – 2

The lower left block remained fixed¬†throughout the glitzy scrolling / rolling / blinking updates in the sign’s repertoire:

Motel LED sign glitch - 3

Motel LED sign glitch – 3

The affected block is 64 pixels tall and, at a guess, 128 pixels wide. Looks like a module¬†enable failure…

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  1. #1 by madbodger on 2015-07-19 - 09:44

    Some of those modules are driven serially and daisy-chained, so a single break in the data chain could also cause this behaviour.

    • #2 by Ed on 2015-07-19 - 11:26

      Aye, and in that case, it’s always the connector!

      A few days later it was OK (at least on one side), so either a repair crew levitated up there or the mice moved out…

  2. #3 by tantris on 2015-07-19 - 17:11

    Could be weather related.
    Bad connector, exposed traces, or anything that doesn’t like water and then wind, rain, and some bad seal. A day or two with a couple hours of sunshine would also “fix” it again.

    Don’t blame rodents if you can blame an engineer…