Display errors ? (Alesis Quadraverb-display gone 0.5 bad)

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clintrubber

Well-known member
Joined
Jun 3, 2004
Messages
5,982
Location
The Netherlands
Hi,

Who knows more about how those 2*16 character displays work ?
If they go bad, what could be wrong ?

Displays like this one:
edit: -- non working link to pic remived, I guess we all know how a QV looks like --
More specific, the characters on exactly the right half of the display of my old Alesis Quadraverb-plus
have gone. The orange lighting is still complete.
So when we number the characters from left to right, top to bottom,
the characters 9-16 & 25-32 are absent (or very very faint when looking at an angle from above).
The left half works fine.

These display-modules consist of the screen themselves and a PCB behind it with some additional electronics.

When powering on without the connection from main-to-display-module removed I do see
several characters in the righthand side of the display, which gives me the impression that the screen itself is probably still OK.

Anyone experience with repairing/replacing such displays ?
I have schematics etc, but don't want to complicate this post further -
so for now I'm curious to what could go wrong in general and what's
most often the story for displays gone bad.


Thanks,

Peter
 
Hi,
I just have the quadraverb, not the plus, and I have no clue about repairing it (mine still works ok), but there is a freebie on the net to control it from a computer via midi, I had it once but a hd crash wiped it, I'll look.... http://www.harmony-central.com/Software/Windows/quadraverb-patcher32.html for mac: http://webpages.charter.net/jsommer/spaztech/index.html good luck!
mrc
 
I have an old quadraverb that I recently turned on for the first time in some years. The display worked but many characters were now replaced with different characters so the program names were all garblygooped. The programs themselves were still intact. In fact there was a complete Crust set list still loaded.
 
[quote author="mrc"]Hi,
I just have the quadraverb, not the plus, and I have no clue about repairing it (mine still works ok), but there is a freebie on the net to control it from a computer via midi, I had it once but a hd crash wiped it, I'll look.... http://www.harmony-central.com/Software/Windows/quadraverb-patcher32.html for mac: http://webpages.charter.net/jsommer/spaztech/index.html good luck!
mrc[/quote]

Thanks guys - yep, I tried that editor when the display went bad, it works fine, but then something started to itch - curious why that d&mn display was behaving like that.
OK, I'll better stick to that editor. I could mount the QV at the rear of my rack now, freeing up some spoace @ the front :wink:

But serious, there seem lots of people around with QV's with faulty disp[lays. OK, it's an old unit, but remarkably still. And it seems we all have slightly different errors...

Bye,

Peter
 
OK, aside from whether the display can be repaired or not, I am curious to how such displays actually work. There are eight datalines going to the display-unit, +5V, ground and a few additional ones. How's the mechanism/clocking/whatever for such (say) 2*16 displays actually done ? Couldn't find a good link explaining it, so if someone knows of one it'd be interesting.

Thanks
 
This is a common problem with the GT, there used to be a webpage on fixing it I believe, but that was a long time ago. Maybe try synth-diy.

adam
 

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