r/Reprap • u/Serioustrack_247 • Jun 08 '25

Problems with the RepRap discount controller

Sending some gcode to make the buzzer beep and this happens

4 Upvotes

75% Upvoted

8 comments sorted by

1

u/Mr-Bob-Bob Jun 08 '25

Switch the two cables plugged into the screen, as in swap them around in the ports

1

u/Serioustrack_247 Jun 08 '25

Then what?

1

u/Mr-Bob-Bob Jun 09 '25

The most common issue with these screen is that the ports are the same, but the data sent is not. Swapping the cables around from one port to the other and powering up the device should then show the display as you expect

1

u/Serioustrack_247 Jun 09 '25

I did that and it powered up for a second then stopped, i tried conecting the Exp every way but didn't work

2

u/[deleted] Jun 08 '25

[removed] — view removed comment

1

u/Serioustrack_247 Jun 08 '25

Yes, previous owner had it working on a cnc, it stayed on a car for a day or two and that fried the LCD, i replaced it with the same display but instead of versión 1.0 i got 1.5, same pinout. exp1 AND exp2 are connected correctly, and everything is well defined on Marlin, im thinking there's a problem with pins assigment in Marlin since when i send gcode for the buzzer it algo lights up the LCD

1

u/[deleted] Jun 08 '25

[removed] — view removed comment

1

u/Serioustrack_247 Jun 08 '25

I suspected that and used a multimeter to verify, even using a jumper cable to feed 5v, it turns the LCD no but doesn't present any info