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4hv.org :: Forums :: Computer Science
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Broken ICL7106?

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Conundrum
Sun Feb 10 2013, 08:26AM Print
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all.
Just changed out the display at great expense and... Still doing weird segments frown

Its one of the Vellemann kits, which I like as they have an uncommitted pad area on one corner of the PCB,
which is just the thing for installing laser sensors etc on.

The voltage sensitivity is a bit strange, and whenever it changes random dots appear on the decimal area.
Yet the other correct decimals seem to behave perfectly.

Any ideas? I am loathe to throw it away because it cost £29.
thanks, -A

#include "OMGWTFZPMBBQ.h"
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Patrick
Mon Feb 18 2013, 06:35PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
is this a dot matrix display, or a 7 segment type?
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Conundrum
Tue Feb 19 2013, 07:29AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
7 segment, I've wondered about just grounding all the dots but that would affect other functions.
Whats strange is that the readings are all over the place, so I suspect either a broken ground INSIDE the chip or some other anomaly.
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Steve Conner
Tue Feb 19 2013, 01:09PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
If it displays all F's, that means it's F'd. smile
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Patrick
Wed Feb 20 2013, 07:56PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
i might have a solution, let me PM you.
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