K5synth

Yes, it looks inverter is OK. So maybe just connection between EL foil  
in display or EL foil is bad. Measure tis high voltage directly on  
display contacts.

If there's a voltage, then you have to change EL foil for the new one.  
Ask here:

http://www.backlight4you.com/

I have very good experience with their products and service.

It seems that display is of standard type and could be replaced by  
modern one with LED backlight if there's enough space inside the  
machine. It needs some modification of circuit, soldering the  
connector, and removing inverter.

Daniel Forro


On 8 Feb, 2014, at 12:38 PM, <kholt81936@...> <kholt81936@... 
 > wrote:

>
> I decided to do something about the dead backlight in my K5, but  
> wanted to make sure the inverter wasn't dead also.  I never heard  
> any high pitched whine from the inverter, but decided to see if  
> there was any AC curent flowing.  I unplugged the green and violet  
> leads from the board and when I turned it on, I immediately heard  
> the very high pitched whistle coming fro the inverter.  When I  
> touched the probes from my multimeter to the pins, I got a reading  
> in excess of 100 volts (hard to read the scale accurately due to  
> fluctuation caused by my shakiness touching the pins).  From this, I  
> can presume that the inverter is still fuctioning?  When I plug the  
> dead backlight back in, the whistle isn't there.