Got a call to fix an Outdoor LED School Sign. Never worked on one and need to get smart about them.
The sign is outdoor of course and has a computer to program it from inside in the office. Apparently the computer and monitor works well but the sign is only half there. Not sure which half. Sign is 4 years old.
Any input will be appreciated.
Thanks Bob AZ
I tried repairing one where damp air had got inside and corroded pins , mainly on the data line expander chip , inside the sign. So parts of letters were missing. Removing the big chip , abraiding pins, and soldering to an intermediary turned pn socket worked for a year or so and then corrosion got down inside the encapsulation - could not find a direct pin for pin replacement, but with some research a functional replacement could probably have been found.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
On 04/30/2009 06:36 PM, Bob AZ sent:
Hello Bob:
Hopefully the manufacturer and installer was tech manuals that'll still be there along with a phone number for support if unique parts are needed.
Suspect a power supply failure, vandalism, or moisture intrusion.
Please update us with your progress. Good luck.
Pete
-- 1PW @?6A62?FEH9:DE=6o2@=]4@> [r4o7t]
letters
got
probably
By expander I think it was something like expanding 8 data lines from the serial receiver up to 96 lines for 80 columns and 16 rows or whatever the matrix was, so sometimes column/s would be missing and sometimes row/s missing
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
On Thu, 30 Apr 2009 18:36:31 -0700 (PDT), Bob AZ put finger to keyboard and composed:
Here is a scoreboard kit:
The article is pay-for-view, but here are some pictures:
- Franc Zabkar
-- Please remove one \'i\' from my address when replying by email.
Sounds a bit hopeful to me. This is the real world.
Gareth.
Yeah, I hate to say it, but that's being *very* optimistic.
--
W
. | ,. w , "Some people are alive only because
\\|/ \\|/ it is illegal to kill them." Perna condita delenda est
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