this is my first post… I’ve build a core module from mike, loaded mios into pic but no LCD messages displayed (if I send a clear to LCD from miosstudio debug I get a couple of vertical lines on and off for a while then nothing), backlight is ok and could be dimmed, contrast trim is halfway.
LCD is 20x2 chars branded Powertip PC2002LRS
pics and pinout, that seems compatible, are in the attachments
not sure about the onboard chips compatibility.. any suggestion/experience to share?
btw… I’ve uploaded LCD benchmark… but nothing displayed either..
the KS controller is HD44780 compatible. Virtually any text LCD is compatible nowadays that has 16 pins connector (or sometimes 14 plus 2 separate for backlight) and matching pin names. So this can’t be the reason. Most LCD problems of midiboxers are caused by wrong wiring and/or bad soldering/shorts, so first doublecheck everything again.
…seriously, could be a faulty LCD? on startup I only see poor signs of life, some blocks/lines feeded then go off and remain off…
the normal startup would be to have the first line (full normal height of the first text row) full of blocks. It should look like the last one on this picture:
So if you mean by “some blocks/lines” that only some intermittent parts if the display go black, perhaps it is broken. On the other hand, the subsequent clearing of the display is a sign of life.
