Frankensteinowner Posted February 4, 2021 Share Posted February 4, 2021 Hi New to this forum. Just bought a Pin2DMD on what I believe is called an Evo board (black PCB with holes for ribbon cables to run between the modules) for installation in a DE Frankenstein - display looks really great - had a few issues with what looked like random dots being lit but, refitting the MuMetal screen from the original DMD seems to have fixed that so, really pleased (other than a couple of dead dots on the modules). I need to activate the display - Hopefully over the weekend Question (at last) - I've seen a few references to an issue with R32 - anyone got a link to what this is all about? Sometimes the display doesn't boot and I need to press the reset button - is it a fix for this by any chance - if not, anyone got any idea what this could be. Any help much appreciated Peter Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted February 4, 2021 Content Provider Share Posted February 4, 2021 The issue you are referring to is that newer chinese LED panels for (and only for) the 192x64 SEGA Pin2dmd needed to change that value of that resistor from 3.9k to 4.7k to work properly. Here are som good example pictures of how it looks like when R32 is not changed with new panels Boot issues are not solved and are often related to bad power supply or bad manufacturing of the pcb Link to comment Share on other sites More sharing options...
Frankensteinowner Posted February 5, 2021 Author Share Posted February 5, 2021 Many thanks Lucky - I'll take a look but, my display doesn't look like that - it looks very good - nice and clear so, I'll shorten some cables (the ribbon cable is massive) and see how I get on with the booting. Link to comment Share on other sites More sharing options...
Newbie77 Posted August 1, 2021 Share Posted August 1, 2021 @Lucky1: the actual BOM-List on GitHub for the 192x64 Pin2DMD has for R32 a 3K9 resistor. Shouldn't be a 4K7? Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted August 2, 2021 Content Provider Share Posted August 2, 2021 10 hours ago, Newbie77 said: @Lucky1: the actual BOM-List on GitHub for the 192x64 Pin2DMD has for R32 a 3K9 resistor. Shouldn't be a 4K7? The 4,7k was only a temporary fix to make some panels work. I added some level shifters instead in the new layout which should address the issue although I could not test it with the problematic panels because I do not have them. Please also read this about 192x64 panels Link to comment Share on other sites More sharing options...
Newbie77 Posted August 2, 2021 Share Posted August 2, 2021 1 hour ago, lucky1 said: The 4,7k was only a temporary fix to make some panels work. I added some level shifters instead in the new layout which should address the issue although I could not test it with the problematic panels because I do not have them. Please also read this about 192x64 panels thanks for the information Link to comment Share on other sites More sharing options...
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