I have this LCD screen handing around at my house that i salvaged when dismantling an old 3d printer (for which i cannot remember the brand or anything).
I search every possible code printed on the casing without results, so I could not find any datasheet.
I started reverse engineering with the help of chatGPT and this is what i discovered so far:
pin 1 is voltage.
pin 2 is ground.
pin 7 seems to control a built-in LED, when i connect it to a digital pin and turn it on/off the built in LED turns responds accordingly with a very bright light.
pin 13 turns on the backlight of the screen.
I am not asking you to identify the board or do the work for me, I would like to understand more generally from any Arduino veteran how would you approach the problem, what's the correct process to follow, if there are tools to run diagnostics or anything.
I now a new LCD is worth like 1$ but I am an old school guy who hates to throw in the trash stuff that still works.
I share your mindset. Call me a hoarder, but I don't like throwing stuff away that may still be useful in some project, for either practical or educational purposes,,,
So some years ago I got these bankcard readers that were of no use to me, but they had an LCD display that I could would like to use. I published two videos on YouTube about how I approached this : part 1 and part2
Basic steps taken:
open the device, measure pins with multimeter
solder jumpers for breadboard use
use logical analyzer, guess and compare
write Arduino library.
Looking at your pictures, it seems that your LCD also has a touchscreen. I have no experience with that. It seems like the PCB doesn't have any processor, so you should be able to use the edge connector. It may be helpful to put it all in a diagram to see how/which LCD pins are wired to that PCB. Since you only have 14 pins, it could be that your LCD doesn't use 8 pins for data, but maybe it does. Use your multimeter in continuity mode to see which pin goes where.
Did you find any more info on it? I have the same screen, it was taken from a Rapman printer, but searching on forums I could only find information regarding other models, probably from different versions of the printer.
I found this, which seems like the printer's firmware and has code regarding the screen, but I'm really not knowledgeable enough to understand it.
The subject of repurposing displays from old equipment comes up fairly regularly in the forum. The display assembly has usually been produced for a specific customer and information such as pinout or driver chip etc isn't generally available to the general public.
Your best starting point is if you still have the equipment that the display came from. You can then reconnect the display and probe the interface connector with one of the cheap 24MHz logic analysers to see if any obvious signals are present.
The display may have a high speed SPI interface in which case locating the clock pin won't be hard to do at all. After that locating the data pin and the chip select pin should be fairly straightforward.
You would still need to make a guess as to what the actual display controller chip is.
You could start by creating a schematic of the display board as that should help you identify power, ground and the pins associated with the LED and pushbutton.
I think that LCD panel is from 3D SYSTEMS Cube 2nd or 1st generation product. It looks almost identical to mine. I don't know how to control this LCD panel, but I hope it helps a little.
