Hey everyone!
Glad to see there are other out there with this little classic. I bought a K4 (not K4r) a few years back as a part of a bundle deal from a friend. It was in used but working order and it saw a couple years of use from me too, and all was well.
Then, I started building a Midi Controller following some plans online, and needed a 2x16 character LCD for the project. So, being cheap and crafty at the time, I said to myself, rather than buy one, why not just borrow the one from inside the K4. That worked out at the time.
Fast-forward approx 10 years, and I want to restore that K4 to its original glory and use it as a keyboard once again. Problem is, I can't find the original LCD or midi controller project anywhere...
So, a couple weeks ago I ordered the exact replacement off of eBay. While waiting for the replacement to come in, I opened the thing up and saw that the button-cell battery had leaked, so I replaced it (yes, i know, big no-no). Then, i received the LCD, made an improvised ribbon cable with an old IDE cable i had, and soldered one end to the LCD and connected the other end to the board following the 1:1 pinout i saw on the schematic i have.
Now, I turn the unit on, the LCD turns on/green backlight, however NOTHING else happens. No message at all on the display and, when connecting headphones to the audio outs, nothing is heard when keys are pressed.
I just read in the other LCD thread that, if the battery is removed while the unit's unplugged, this causes a loss of data. Now, is this what's affecting me, or is there a greater issue?
Any input would be greatly appreciated!!!!