Sibi Posted October 2, 2017 Share Posted October 2, 2017 Its not realy fake. But its dont work on real pins. Inputs are so sensitive, most time i have garbage on display or no picture at all. With old discovery board it works with no problem. I put sheald on cable, take suply from outher source.......but no result. This boards have all grean leds and dont have st marks. And pins are not solder. Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted October 2, 2017 Content Provider Share Posted October 2, 2017 Another pin2dmd user had such boards also and I could resolve the problems by replacing the diode D3 with the correct type BAT60 Link to comment Share on other sites More sharing options...
Sibi Posted October 2, 2017 Author Share Posted October 2, 2017 Thanks for the tip, will try tomorow and report. Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted October 3, 2017 Content Provider Share Posted October 3, 2017 8 hours ago, Sibi said: Thanks for the tip, will try tomorow and report. If I remember correctly the 3,3V were significantly lower with the wrong diode. Link to comment Share on other sites More sharing options...
Sibi Posted October 4, 2017 Author Share Posted October 4, 2017 3.3 was about 2.6 after diode. Change diode with another shotky, than it was 3.1. But stil nothing. Than bridge diode ( diode sepaarate 3.3 from stabilisator and st link conector, that i dont use anyway) and stil nothing. When board get signal from pin led that is betwen switch start to blink only if i set mode to bally/wiliams, like it recognize signal. Also when try to record file with pin2dmd.exe, and open it in notepad all fields are 0. Any one have any idea. Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted October 4, 2017 Content Provider Share Posted October 4, 2017 I assume that the red led is blinking which means wrong data format. You could try to change the enhancer if that works. Voltage should be 3,3V . Link to comment Share on other sites More sharing options...
Content Provider UncleSash Posted October 7, 2017 Content Provider Share Posted October 7, 2017 Hey @Sibi where are you located?When you are in the USA, I would like to make a nice deal with you, for a V3 Shield?Just send me a PM Link to comment Share on other sites More sharing options...
Sibi Posted October 8, 2017 Author Share Posted October 8, 2017 Sory Sash, but im not customer for you. I like to make things by my self. Found some old pcb design, but i made shild only for my real pins, so that design is enough for my neads. And making one side pcb heare in Serbia cost me about 15 eur for 10 pcb. I put dc-dc on board (see all using them now, but no one sed thanks for idea) and switch for next shild. And thats enough for me. I dont even use sd card boards, just solder pins to sd to micro sd adapter direcktly, and use micro sd card. When you live in country where most people earn 300eur per month, you must bild from scratch. Link to comment Share on other sites More sharing options...
Sibi Posted October 9, 2017 Author Share Posted October 9, 2017 Finaly get time to get scope in hands and compare signals on fake and real discovery board. When red led, green on fake, blinking it means signal is not good ( thank lucky for tip). In my boards signal from pin go over 220 ohm resistor to input on discovery. On fake discovery signal behind resistor is significaly lover then on real boards. Look like internal resistance of fake boards is much lower then on real. Short wireing of resistor solve problem. Thanks everyone for help. Link to comment Share on other sites More sharing options...
realpinz Posted December 31, 2017 Share Posted December 31, 2017 I too have had some issues with some discovery board purchases from china. 407's One batch had the micro USB mounted upside down ( original discovery actually had an inverted micro usb socket ) effectively reversing 5v and gnd from the host computer usb port. Luckily my PC had a current limit on the ports. Another batch had a much different boot loader firmware that caused similar issues to what you are experiencing. Google it and there should be a repository with an older version of the boot loader/firmware ( hardware level, works in unison with the programme firmware you load on top, aka PIN2DMD ). In both cases I was able to get all the discovery boards working. Why they change things batch to batch is beyond me, similar issues with the led panels RGB,GRB issues and driver timings causing pixel ghosting/bleeding. Still worth all the hassle, my Simpson's pinball party looks awesome in glorious pin2dmd colour. Good luck. Link to comment Share on other sites More sharing options...
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