weedoo Posted December 3, 2011 Report Share Posted December 3, 2011 After a while away, I started playing around with my not completed mb-6582. I am having a weird problem with my LCD. When I turn the device on the only thing I see is the backlight working. There is no text written. I am able to upload the test tone and the mb6582 setup file. Both give the exact same result. I tried 2 different LCD (different brand and model) and both react the same way. Anyone has an idea ? Quote Link to comment Share on other sites More sharing options...
nILS Posted December 3, 2011 Report Share Posted December 3, 2011 Wiring, shorts? Quote Link to comment Share on other sites More sharing options...
weedoo Posted December 4, 2011 Author Report Share Posted December 4, 2011 I'm sure about the wiring, I used the same lcd as in Hawkeye's tutorial, the same wiring. As for shorts, I guess this is the last thing to check for. I'm not the best in electronic. I'm good at soldering but debugging a board is alot for my knowledge. Any other clue ? Quote Link to comment Share on other sites More sharing options...
Astazou Posted December 4, 2011 Report Share Posted December 4, 2011 wrong contrast pot setting :whistle: ? Quote Link to comment Share on other sites More sharing options...
julienvoirin Posted December 4, 2011 Report Share Posted December 4, 2011 bad LCD Cable. check it. i debug a similar problem on a MB6582, and the cable was cut (but wasn't visible, f***ing ribbon) Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted December 4, 2011 Report Share Posted December 4, 2011 +1 on the poti setting, which is a classic :) Quote Link to comment Share on other sites More sharing options...
weedoo Posted December 5, 2011 Author Report Share Posted December 5, 2011 Damn... I found it !!! The first LCD I used is fried. The second worked... when I started playing around the potis.... damn me, you guys were right !!! I now get E002|H128*Ld Chn.16 1***|<Ens. BankStick Is there any list of error codes available ? Thanks again guys. Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted December 5, 2011 Report Share Posted December 5, 2011 (edited) That is no error code, it says Ensemble 2, Patch H128, Lead Instrument, Listening on MIDI Channel 16, SID Pair 1 active in user interface (2-4 not active) So, have fun with your new fantastic synth! Greets, Peter Edited December 5, 2011 by Hawkeye Quote Link to comment Share on other sites More sharing options...
weedoo Posted December 6, 2011 Author Report Share Posted December 6, 2011 Oh my god oh my god oh my god. IT'S ALIVE !!!!! Quote Link to comment Share on other sites More sharing options...
inductionloop Posted December 29, 2012 Report Share Posted December 29, 2012 I finished my MB-6582 about 3 weeks ago and had this exact problem, but chose to just use CTRL to mess around with it while i figured it out. I can not believe all i had to do is twiddle the contrast pot a bit!! Quote Link to comment Share on other sites More sharing options...
SpaceFire Posted July 14, 2014 Report Share Posted July 14, 2014 Hi, Sorry if this is a foolish question, but.. where is the contrast pot setting and how does one go about adjusting it? Thanks, SF Quote Link to comment Share on other sites More sharing options...
ilmenator Posted July 14, 2014 Report Share Posted July 14, 2014 Grab a small screwdriver with your right hand, insert the blade into the contrast pot, and perform a rotary motion :-) Quote Link to comment Share on other sites More sharing options...
SpaceFire Posted July 16, 2014 Report Share Posted July 16, 2014 (edited) Ok thanks very kind of you to help out! next dumb question: Where is the pot located exactly, is it on the display module or the main PCB or erm..? Thanks in advance, sorry for my newbie questions, I have yet to build my own, I figured the best approach was to acquire a working one to cross reference first * and get to know it inside and out, so I'm coming from a bit of a reverse 'engineering' approach, if you see what I mean. * (before attempting a build, I was a bit concerned the whole project had wound down on the forum and I might not be able to get much advice) SF Edited July 16, 2014 by SpaceFire Quote Link to comment Share on other sites More sharing options...
Imp Posted July 16, 2014 Report Share Posted July 16, 2014 Search the wiki for "mb6582" and you will find the page with the details. There's a FAQ on it. Quote: What is the function of P1 (extreme lower right corner)? LCD backlight brightness control, just like on the Core module. The pot for contrast should be somewhere in that area. Quote Link to comment Share on other sites More sharing options...
SpaceFire Posted August 10, 2014 Report Share Posted August 10, 2014 Found it : ) posted here for others also looking in future Likewise, do I really need to mount pot P2 for the slave cores? As above, these are the contrast pots for LCDs so they're only useful for troubleshooting. If you want to save on trim pots, you could short between the middle pin and the left or right pin, this would approximate turning the trimpot fully one way and at least let the LCD display something when connected to slave PICs. Cool thanks Imp, I fixed the contrast, no idea why it was set so low looks great now, it's odd though because if all those pots by the BSL chips are for LED contrast why does only one of them change it? Thanks, SF Quote Link to comment Share on other sites More sharing options...
SpaceFire Posted August 10, 2014 Report Share Posted August 10, 2014 (edited) bonus point... with slight pressure (very slight) direct to the bare front of LCD I was even able to unstick a stuck line on the display... wootz! Edited August 10, 2014 by SpaceFire Quote Link to comment Share on other sites More sharing options...
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