Re: A92: screen backlight

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Re: A92: screen backlight


I've done a little more research on the indiglow strips too.  It appears 
that some of them use an "inverter" which converts low power DC voltage to a 
higher voltage used to run the strips.  They can still do this at fairly low 
current consumption.  So it may still be possible to use your 115 volt strip 
on a 6 volt calc.  I also saw an article on installing these strips in 
calcs.  I can't remember exactly where I found it, but it involved using a 
hacksaw to remove the foam pad, and then peeling off the reflective backing, 
and inserting the strip.  It sounds a little risky, but very possible.  I 
will send you the address of the site if I can find it.  Or if anyone else 
knows where it is feel free to send it to us.

Kebes

>From: Betelg@aol.com
>Reply-To: assembly-92@lists.ticalc.org
>To: assembly-92@lists.ticalc.org
>Subject: Re: A92: screen backlight
>Date: Sun, 7 Nov 1999 20:32:46 EST
>
>
>you can get indeglo strips for all sorts of different voltages... I have 
>one
>here that expects 115, it all depends.  anyway, I've messed with the LCD's 
>on
>gameboys and 83's, and I don't think it woule be that hard.. I'll test it 
>on
>my old BW game boy, and I'll get back to you.
>
>
> > Your idea would be nice to do.  I would like a backlight on my 92 as 
>well.
> >  But I've looked inside at the LCD and it looks like it would be hard to 
>do
> >  safely.  The LCD is held down by a double sided sticky foam pad that 
>would
> >  make it very hard to romove.  There are 2 main dangers in trying this.  
>1-
> >  Cracking the LCD while trying to remove it, and 2- Damaging the fragile
> >  connector strips along the top, and side.  If even one connection were
> >  broken it would take out an entire row, or column of the LCD.  And I 
>guess
> >  the third problem would be getting the "paper" backing off of the LCD 
>and
> >  replacing it.  It seems to be glued to the back.  I suppose that other
>calcs
> >
> >  may be put together different than mine, so I won't say you can't try, 
>but
> >  it looks pretty impossible to me.  Sorry.
> >
> >  Kebes
> >
> >  PS. The 92 runs on 6 volts which should be enough to run an indeglow 
>strip
> >  (watches are only 1.5 - 3 volts).  In fact 6 may be too much, but you
>could
> >  easily put a resistor in series with it to make it work.  Good Luck.
>

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