i have a solid blue screen on my 12864 full graphics controller lcd...ive reloaded firmware ive downloaded marlin from somewhere on the forum that was supposed to run but didn't...i have a folger tech prusa i3 2020..im getting sick of this thing and trying to get everything to work correctly. I'm about to junk it..can somone please give me their marlin firmware "that works" so i can get this usable..thank you https://reprap.org/forum/read.php?4,544783,544783#msg-544783 Tue, 21 Jul 2026 00:11:26 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,544783,570734#msg-570734 https://reprap.org/forum/read.php?4,544783,570734#msg-570734 bgllvr Reprappers Wed, 14 Oct 2015 22:37:18 -0400 https://reprap.org/forum/read.php?4,544783,545161#msg-545161 https://reprap.org/forum/read.php?4,544783,545161#msg-545161 Cbrowder22 Reprappers Wed, 12 Aug 2015 22:44:19 -0400 https://reprap.org/forum/read.php?4,544783,545150#msg-545150 https://reprap.org/forum/read.php?4,544783,545150#msg-545150
- Tim]]> tadawson Reprappers Wed, 12 Aug 2015 21:38:02 -0400 https://reprap.org/forum/read.php?4,544783,545131#msg-545131 https://reprap.org/forum/read.php?4,544783,545131#msg-545131 Cbrowder22 Reprappers Wed, 12 Aug 2015 19:45:16 -0400 https://reprap.org/forum/read.php?4,544783,545027#msg-545027 https://reprap.org/forum/read.php?4,544783,545027#msg-545027 cat.farmer Reprappers Wed, 12 Aug 2015 13:40:14 -0400 https://reprap.org/forum/read.php?4,544783,544989#msg-544989 https://reprap.org/forum/read.php?4,544783,544989#msg-544989 Cbrowder22 Reprappers Wed, 12 Aug 2015 11:56:18 -0400 https://reprap.org/forum/read.php?4,544783,544980#msg-544980 https://reprap.org/forum/read.php?4,544783,544980#msg-544980
If you can see pixels over most of the display, with a solid blue margin around the edge, then the contrast is OK and it's a connection or firmware issue.]]> dc42 Reprappers Wed, 12 Aug 2015 11:43:30 -0400 https://reprap.org/forum/read.php?4,544783,544965#msg-544965 https://reprap.org/forum/read.php?4,544783,544965#msg-544965
- Tim]]> tadawson Reprappers Wed, 12 Aug 2015 11:15:33 -0400 https://reprap.org/forum/read.php?4,544783,544818#msg-544818 https://reprap.org/forum/read.php?4,544783,544818#msg-544818 Cbrowder22 Reprappers Wed, 12 Aug 2015 01:21:49 -0400 https://reprap.org/forum/read.php?4,544783,544811#msg-544811 https://reprap.org/forum/read.php?4,544783,544811#msg-544811
- Tim]]> tadawson Reprappers Wed, 12 Aug 2015 00:29:47 -0400 https://reprap.org/forum/read.php?4,544783,544807#msg-544807 https://reprap.org/forum/read.php?4,544783,544807#msg-544807 Cbrowder22 Reprappers Wed, 12 Aug 2015 00:14:17 -0400 https://reprap.org/forum/read.php?4,544783,544796#msg-544796 https://reprap.org/forum/read.php?4,544783,544796#msg-544796

• Make sure your EXP1 and EXP2 connectors are not swapped
• Some have reported the silkscreen on the LCD PCB is incorrect and that in addition to switching EXP1 with EXP2, they needed to rotate the connectors 180 degrees
• In Marlin configuration make sure you have the line #define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER uncommented
• Make sure you have included the U8glib library in the Arduino IDE

Thats the basic checklist. I would suggest taking a fresh, clean copy of Marlin (I'm using the development branch myself) and first just setting the correct motherboard and movement settings. Then upload the firmware and make sure it all works. Next add the U8glib library to Arduino IDE and uncomment #define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER (by deleting "//" from the beginning of the line)
Now compile, upload and check if it works. If not, swap out EXP1 and EXP2 on the display controller]]> thucar Reprappers Tue, 11 Aug 2015 23:02:47 -0400 https://reprap.org/forum/read.php?4,544783,544783#msg-544783 https://reprap.org/forum/read.php?4,544783,544783#msg-544783 Cbrowder22 Reprappers Tue, 11 Aug 2015 21:39:31 -0400