Casio CZ/ VZ/ FZ - Pro Series

>I can buy a CZ-1 which is 100% operational but all LEDs are dead.
>The owner says they all died at once some time ago. But the synth is
>still working, there are just no lights anymore.
>I know the synth can be operated without these LEDs as almost all
>information is also displayed on the LCD, which is still working.
>
>But I'm a little worried... Is this an indication of the "beginning of
>the end" of that synth ? Is it wise to buy that synth ? In my country
>CZ-1's are very hard to find...
>
>Does anyone have experience with this problem or some advice ?

I've never heard of the problem (don't have a CZ-1 anyway).  Most likely the 
LEDs are perfectly functional, it's something to do with whatever circuit is 
driving them that's bad.  If the synth is otherwise fine, I don't think it's 
a sign that more things will go wrong later.  If you don't mind using it 
that way I see no reason to not buy it (it might be more difficult to sell 
later, but it's not like they're worth anything anyway).  You might want to 
open it up and see if there's a broken wire or something, it could be very 
easy to fix.