This is more of a "dump" than a log.

I took apart the display and traced out the LCD PCB using a combination of a multi-meter, and by taking photos of both sides of the PCB and overlaying them in Photoshop.

I then had to convince the ICM2 unit to turn on the display for me, in order for me to measure voltages and data being sent to it. I knew that I had to complete the MOST ring-bus loop before the ICM2 would boot, so I did that by shoving a plastic S/PDIF cable into the MOST port:

That worked perfectly! I was then able to plug in my Kingst LA2016 logic analyser...

...and by doing so I could identify that an I2C bus was being used to control the display.

I then made a full schematic of the PCB circuit using KiCAD 5 - mainly to practice drawing schematics - and also to have a place to store important electrical notes regarding the display interface.

I don't have any good-quality photos, but I actually reverse-engineered the I2C commands by using a BusPirate V3 (python scripts used are in the GitHub repo). I then moved onto using an ESP8266-based NodeMCU board.

I initially translated the BusPirate python scripts line-by-line into C for the Arduino, before creating a proper library for the display by inheriting from the Adafruit_GFX class. (Note: it is very roughly made...)

Here's what the wiring for that looked like - with wires soldered onto vias on the back of the LCD module and plugged straight into a breadboard:

My current hardware setup looked somewhat like this, with an included DC-DC step-down converter. The step-down converter is usually set to output around 7V - this is because the LED back-light array(s) need about that much (plus pulse width modulation for brightness control) in order to achieve better brightness:

That's all for now - I'm waiting on some parts in the mail to "break out" the 0.5mm FPC connector into a through-hole format. Hopefully this will allow for a less invasive install procedure (by plugging directly into the intended ribbon cable) - and will result in less issues with dodgy wire connections.

I do wish to experiment with an I2C multiplexer - to allow for in-system switching between "stock" and "custom" display routines. Endless possibilities, endless fun!