3D Printing Forum

Have a question on a Reprap_Discount_Smart_Controller for some reason on Red (" Name of 3D Printer ").
When it it powered on and I insert a SD card it will not recognize the SD Card.
It on the other hand I power it off then insert the SD card and Power it on it will function correctly.

Have two 3D Printers that are running the same firmware, only difference is CUSTOM_MACHINE_NAME.
1st name is "HicRed 2.0.3"
2nd name is "HicBlu 2.0.3"

Does anyone have a explanation of why this is happening.

Are you using the SD built into the display or the one on the mainboard (newer mainboards have it there due to signal integrity issues). If on the display, you may need to shield your cables to the display. Try wrapping them in tinfoil as an experiment.

My Controllers Base V1.3 and MPX.3 do not have a SD on the Main board.
So to answer your question I am using the LCD SD Card reader.

I added EFI shielding three years ago threw the entire length of the ribbon cable.
They have worked perfect for 3 years, only sense upgrading the Marlin 2 has one been fighting with me.
Do not get me wrong I do not believe it is a Marlin 2 problem, could just be that the SD card detect is goofy.
An for some unknown reason when the SD is inserted before boot-up it finds an detects the SD anyway.

You could try swapping the displays between red & blue, see if the problem follows the SD card slot. Worst case, you may have worn out the SD slot or controller. Replacement displays are ~$12 on amazon.

I Could for a simple test, Though did not think about that because I have different color cases.
I though about getting a pair of these "12864 Display LCD 3D Printer Control Panels.
Will do the swap 1st to test the controller...

Ok!
Swapped the 2004 LCD discount smart Controller and of course the Problem followed.

I know that upgrading to the 12864 Display LCD 3D Printer Control Panels will mean I have to Print new Cases.
It means to keep same display location need to design a similar case for front support frame of the 3D Printer.