Casio CZ/ VZ/ FZ - Pro Series

Somebody did this difficult task with removing reflective foil, I try  
to remember where I have seen it... Maybe I have the file somewhere on  
my hard disk...

...
googling
...
Found it:

www.compsys1.com/support/docs/ELbacklight_Guide.pdf‎


Rather difficult job, and if I remember well he used EL foil, there  
was no place for LED backlight.

I doubt it's possible to modify standard display for LED backlight. If  
it's possible technically it would be a big effort which has no sense  
when we can use cheap new display with LED backlight. If the original  
display uses usual standards for displays (not all were standard) and  
inside the instrument is enough space (LED backlit displays are  
thicker) then the modification is not so difficult. Just remove  
inverter and its circuit, solder limiting resistor and bring +5  
Volts...  Even size of display and holes for screwing it are standard.  
See for example here:

http://www.wolzow.com/analog/mdf2.htm

Some users even used VFD or OLED displays successfully...

...
googling
...

Here is something similar:

http://www.instructables.com/id/DIY-LCD-backlight/?ALLSTEPS

http://www.circuitbenders.co.uk/forum/index.php?topic=945.0

So the point is to remove only reflective foil, not polarizing foil.

Another problem is to align elastomer zebra contacts to proper  
position not to lose some rows of pixels.... I did this more times and  
it's pretty difficult. I lost two big graphic displays because I  
couldn't find the right position. Maybe with simple alphanumerc  
display it can be done.

Daniel Forro



On Sep 16, 2016, at 6:39 PM, Lee templarser@... [CZsynth] wrote:

>
> Does anyone have any idea where to actually put a replacement light?
> My understanding is that retro equipment used an inverter which is  
> used in 'foil' displays: I have access to a couple of LED flat  
> lights,but slipping them behind the LCD causes no light through the  
> LCD.
> An online article suggested the display needed the backing removing  
> before the light would shine through.
> Has anyone any experience of altering backlights?
>