Marlin: Issue Connecting MKS MINI 12864 with RUMBA

[BlocksTechnology]

So i tried connecting an MKS MINI 12864 to my RUMBA board, using Marlin 1.1.6 and defining the lcd in my configuration file like this:

Configuration.h
board ***

// SERIAL_PORT selects which serial port should be used for communication with the host.
// This allows the connection of wireless adapters (for instance) to non-default port pins.
// Serial port 0 is still used by the Arduino bootloader regardless of this setting.
#define SERIAL_PORT 0

// This determines the communication speed of the printer
#define BAUDRATE 250000

// This enables the serial port associated to the Bluetooth interface
//#define BTENABLED              // Enable BT interface on AT90USB devices

// The following define selects which electronics board you have.
// Please choose the name from boards.h that matches your setup
#ifndef MOTHERBOARD
  #define MOTHERBOARD 80
#endif

** lcd ***

//
// Makeboard 3D Printer Parts 3D Printer Mini Display 1602 Mini Controller
// https://www.aliexpress.com/item/Micromake-Makeboard-3D-Printer-Parts-3D-Printer-Mini-Display-1602-Mini-Controller-Compatible-with-Ramps-1/32765887917.html
//
//#define MAKEBOARD_MINI_2_LINE_DISPLAY_1602

//
// MKS MINI12864 with graphic controller and SD support
// http://reprap.org/wiki/MKS_MINI_12864
//
#define MKS_MINI_12864

//
// Factory display for Creality CR-10
// https://www.aliexpress.com/item/Universal-LCD-12864-3D-Printer-Display-Screen-With-Encoder-For-CR-10-CR-7-Model/32833148327.html
//
// This is RAMPS-compatible using a single 10-pin connector.
// (For CR-10 owners who want to replace the Melzi Creality board but retain the display)
//
//#define CR10_STOCKDISPLAY

And all i got was backlight like in the picture below.

After that I began trying diferent combinations with boards that I had around and I manage to make all the different combinations below:
1 - MKS mini v1.2 programmed as Rumba board

2- MKS mini v1.2 programmed as an MKS board

3- Ramps 1.4 programmed as Rumba

4- Ramps 1.4 programmed as Ramps

All worked fine, detecting if the SD was inserted and everything.

I tried all combinations of EXP1 and EXP2 between the LCD and the board RUMBA and the best I managed to get was the backlight on and some residual image like in the picture below:

I think this is a PIN definition problem but I can't find which ones. If someone could take a look at this that's would be great.
Thank you for your attention and sorry for the long post but I thought it would more useful this way

[AnHardt]

The last picture looks more like a timing problem than a pin problem.

// If you want you can define your own set of delays in Configuration.h
//#define ST7920_DELAY_1 DELAY_0_NOP
//#define ST7920_DELAY_2 DELAY_0_NOP
//#define ST7920_DELAY_3 DELAY_0_NOP

[BlocksTechnology]

AnHardt thanks for the reply, I tried uncommenting those defines and it still shows the same problem as before. Any idea which value should I put in each delay?

[Bob-the-Kuhn]

Below is the MKS MINI 12864 pinout and the Rumba schematic.

If the SD card is working properly then it has to be DOGLCD_A0 and/or DOGLCD_CS that has the problem. Try adding the following defines:

#define DOGLCD_CS        38
#define DOGLCD_A0        41

[BlocksTechnology]

Thank you Bob-the-Kuhn! It's working fine now.