dboyrecords Posted February 20, 2018 Share Posted February 20, 2018 Hi, I've had pin2dmd in my TSPP for several months and working great. This weekend I was messing with my led backbox lights and I seem to have shorted out my pin2dmd. I still get a green light on discovery board but no display. I put the old dmd back in and it's working fine (glad I didn't sell it!). How should I troubleshoot to figure out if I fried the board, the rgb panels or both? Thanks Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted February 20, 2018 Content Provider Share Posted February 20, 2018 Measure the power to the panels first Link to comment Share on other sites More sharing options...
dboyrecords Posted February 20, 2018 Author Share Posted February 20, 2018 I did, for the first time, and found that my 5v power supply is actually supplying 10v! I presume it's been that way all along but I don't know... Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted February 21, 2018 Content Provider Share Posted February 21, 2018 Very unlikely unless you have a dc dc converter installed. The panels are very sensitive to input voltage and you won´t get a good picture with anything above 5V. Link to comment Share on other sites More sharing options...
dboyrecords Posted February 21, 2018 Author Share Posted February 21, 2018 Ok, I'll start with a new power supply. So, the panels may not be damaged just not happy with 10v? Same for the discovery board? Thanks Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted February 21, 2018 Content Provider Share Posted February 21, 2018 I assume that the panels and the disco board is damaged. Link to comment Share on other sites More sharing options...
Ciceronic Posted March 12, 2018 Share Posted March 12, 2018 I know for sure that I by misstake connected the panels to 12V instead of 5V. I also know that sound of electric overload (crackling, frying), so I pulled the chord at once. These became useless (but not exactly dead either, they're constantly like the picture). Buy new panels was my solution, expensive misstake... Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted July 18, 2018 Content Provider Share Posted July 18, 2018 On 12.3.2018 at 7:38 PM, Ciceronic said: I know for sure that I by misstake connected the panels to 12V instead of 5V. I also know that sound of electric overload (crackling, frying), so I pulled the chord at once. These became useless (but not exactly dead either, they're constantly like the picture). Buy new panels was my solution, expensive misstake... Just had one panel here which had the same symptoms. Replaced the 74HC245 input transceiver and three DP5020 LED drivers and now it is working again. Defective ICs could be easily identified by the hole burned into the IC case due to overheating. If you have good SMD soldering skills it might be possible to repair the panels. Link to comment Share on other sites More sharing options...
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