3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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I also suspected a firmware issue but hadn't yet tried anything. I just loaded the stock firmware on to an SD card and still no response from the printer.
I managed to find a circuit board diagram for what I believe is my main board. There are several indicator LEDs, but I think most of them are for indicating that a heating element or fan is turned on, I only see one LED in the diagram that looks like it should be on with the printer.
I've just tried completely disconnecting the BLTouch and reconnecting the stock cables. No change in behavior.
Note that in this picture the nozzle thermistor has been disconnected, but the behavior is still the same.
When you flashed the firmware, did it do anything to show that it was taking the firmware?
either way, I'm thinking you'll have to get help from Elegoo- either instructions to clear it, or a new board. Apparently, though there's two boards in those printers that need flashing. (the main board and the LCD touch screen.) Unfortunately, I can't find any resource online identifying what the LED's indicate :/
EDIT:
So I found MKS's github, which seems to have things for the board here, but i'm not seeing any board hardware stuffs that match a Robin Nano_DW v2.1
I was unable to flash the firmware. Putting the SD with the stock firmware does nothing to alter the behavior. It's still just a blank screen with the backlight on.
Here's a link to the PDF I found of the board's schematics, if you're curious. The LED that lights up for me is on the 3rd sheet. All the others are connected to the hotend, bed, fans etc.
According to elegoo's firmware instructions, the screen itself has updatable firmware too. Maybe you could try updating that as well
Thanks, I had forgotten about the screen firmware. Unfortunately, I just tried that, to no avail.