From: <analogmonster@...>
To: <CZsynth@yahoogroups.com>
Sent: Tuesday, April 01, 2014 9:06 PM
Subject: [CZsynth] Re: Display
> Hate to be the bearer of bad news, but I dont think that a replacement is
> possible at all, although my screen is still partly functional so perhaps
> I havent tried as hard as I would if it was completely dead. Its a custom
> display and I am yet to find someone who has designed a replacement. I
> found this info by looking at the service manual for the vz1 - its the
> same screen (I believe its the same as the FZ1/10 too), and is in the
> photos section of this forum, look for 19_lcd_control.
>
> The screen itself is a 64x96 dot matrix display, driven from custom casio
> LSI chips. I cannot find any datasheet for the HD chips, they seem to be
> a custom order from hitachi as there are similar numbered lcd drivers from
> them. The GAL PD65012 is still available as NOS (new old stock). It is a
> type of programmable logic device (PLD) from NEC. What I dont know is
> whether you can extract the programmed logic from a GAL in a working casio
> synth, or whether you need some kind of source code. It is likely you
> need some pecialist programming machine or software package too. But to
> be honest the answer doesnt really matter if we cant get hold of the
> hitachi chips.
>
> So the driver parts are exclusive to casio, so we cant just find a
> replacement part and swap them. I myself had planned to attempt to find a
> 64x96 screen and try replacing just that part, but I struggled with that
> too - just couldnt find a new one of the right size. With some research
> (cant find the links right now) I discovered that some casio calculators
> have the same screen, so if you can find the same info you may be able to
> rip one out of the right calculator and replace it.
>
> Like I said, my screen is not completely dead, although I thought it was.
> I took my vz10 apart and cleaned up the insides. There was some issue
> with how the screen board connected to the main board, with some gentle
> fiddling I got most of the lines of my screen back. Its far from perfect,
> but it is at least now usable. Perhaps you will find the same. Post back
> if you get any results as I am sure there will be others who have dead
> screen problems at some point. Good luck!