K5synth

Sorry Mo I cannot get a decent picture. It does something slightly different every time it boots. Sometimes it is Matrix-style strings of vertically arranged @ ! ! @ @ @ $> and so forth alternating with a blank vertical column 1 character wide. It then fades to blank (not activated pixels) in about 1 second.  The whole thing from click of the power is 2 seconds long.  It sometimes goes to dark (all pixels activated) and just sits like that.  It seems the rest of the synth is working as I was able to play notes (thought the timbre was horrible lol).  I did find the schematic, so I will take a look at it tonight and double check the mobo around the battery area to make sure I didn't damage anything by accident.  I have found exposed wires in the parallel cables early on and covered/repaired them properly, but I should look further.  Whoever had it before me did some very elaborate chip to chip repairs but also did some garbage-level repairs, which complicates things. And the literal rat(s) that lived in the thing in dude's garage at some point.  There are many layers of possible fail in this bad boy haha.Any thoughts or insights are helpful and much appreciated :)  Yourself and the others are very nice to spend the time to help me out.  I REALLY wish I hadn't changed that battery, but it was starting to "sweat" and was dated 1984 so I thought it should be done smdh.  :(  Hope everyone has a good weekend and if anyone has seen something like that feel free to chime in. 

    On Friday, August 18, 2017 2:41 PM, "Mo Morgan lightsforsynths@... [k5synth]" <k5synth@yahoogroups.com> wrote:
 

     Well you said it was working before. Can you post a picture of what it looks like now ? Maybe it will show something diagnosable

      From: "janegimble75@... [k5synth]" <k5synth@yahoogroups.com>
 To: k5synth@yahoogroups.com 
 Sent: Friday, August 18, 2017 2:34 PM
 Subject: [k5synth] Re: K5 Parts Unit
  
    Mo, I do not have another to test with.  I will try doing some basic diagnostics tonight: continuity thru ribbon cable, display voltages, etc.  I don't have an Oscope for data but usually just check to see if it is pushing any voltage when changing functions.  Are their any pointers you can give or things to watch out for with this display?  Thanks for the kind offers and help :)