Analogue-sequencer

Well, I dug in today to try and figure out my display issue.  Ive 
got V+ around 4.9v at pin 2 and the display brightness V+ is there at 
pin 3 which varies with the trim pot.

  The P3 does boot up, and I can run it (tribute to Colin when 
something as complex as this is also simple enough to run without a 
display:)

  Anyway, is there anything else I could check?  Perhaps a pin or 
something that should be high when the display is active?  The cable 
and connector is good, I checked the header to the display for 
continuity and all 14 wires checked out OK.  It may be the driver IC?

  By the way Colin, I built this from a kit, but its been running 
fine for a year up until this.

  Anyone in the US know where to get an 88x44mm LCD in blue or red or 
something exciting?  

thanks for any thoughts. . .
~Steve
everyone, turn that PLED display brightness DOWN!!



--- In analogue-sequencer@yahoogroups.com, "Colin Fraser" <colin@...> 
wrote:
>
> 
> > Hello list..  my pled display has gone blank recently.  All 
> > connections 
> > internally look/feel solid.  Where can I probe to check for 
> > voltages to 
> > see if the display is truly dead?
> 
> If your P3 is booting up, then the PLED module itself is 
communicating as
> expected with the CPU, so it could be the display element or the 
drive
> circuit for it that has failed.
> First thing to check is that the voltage from the brightness 
trimmer is
> reaching pin 3 on the module.
> If that connection is broken, it will be blank. Doesn't seem too 
likely
> though.
> 
> Although they look great, the reliability of the PLED modules 
hasn't been
> anywhere near as good as it should have been.
> Premature dimming of pixels has been more of a problem than outright
> failure, but I think 2 or 3 modules have died now, out of around 
200.
> 
> For modules that fail under warranty, I'm offering white on blue 
LCD modules
> as a replacement.
> It may be that the PLED modules that have had problems wre from a 
bad batch,
> but I'm not taking a chance on them again.
> 
> Best regards,
> Colin Fraser
> Sequentix Music Systems Ltd
> http://www.sequentix.com
>