Someone at MuffWiggler posted some very useful information.
The MPC3000, as well as a whole host of other AKAI devices from the era, use the now discontinued Sanyo LC7981 LCD Controller in graphic mode. https://www.crystalfontz.com/controller ... LC7981/246
In the MPC3000 & MPC60 The LC7981 is mounted on the I/O board. The displays used don't have the controller onboard. - Kurt.Koolbrain
When you read the datasheet for the SANYO LC7981, you realize that it is just a small microprocessor doing a bunch of mathematical calculations. So you take the data coming from the MPC 4000 video controller and do some math to calculate a video, Hsync and Vsync data stream. Sounds easy but it's not. Fortunately, the microprocessors we need to design a circuit board to do this likely already exist. A bit of programming may indeed be necessary to fine tune the clocking/timing/frequency.
The parts that were used to make the MPC 3000 IB-CRT are still obtainable from places such as aliexpress and a couple other merchants. It would cost me about $100 in parts and shipping but I would have enough for at least 5 prototypes. Utilizing these old parts, with slight modification, could possibly achieve a solution.
MPC 3000 IB-CRT Parts Cost Quantity
IC HD74HC590P Time Relay $2.88 5
IC HD74HC590P Time Relay, processes clock signals $2.88 5
IC LC3517BL-15 Static Ram Quote?
IC HD74HC595P Time Relay, sends 8 bit data to static ram and to HD74HC166P which in turn outputs video signal $10.25 100
IC HD74HC166P Takes 8 bit data from static ram and outputs video signal to RGB $2.21 5
IC 18CV8PC-25 L3022A $10.34 10
IC 18CV8PC-25 L3022B Takes data from Static Ram and Outputs the Vsync $10.34 10
IC PALCE 22V10H-25PC L3022C $7.41 5
IC 18CV8PC-25 L3022D $10.34 10
OSC X TAL TD308C 10MHZ Oscillator? $23.55 2
However, I'm still leaning towards getting someone from Texas Instruments to assist me in finding a more efficient solution.
I reached out to the technical department of 2seemy but have not heard back. I don't expect people who have already designed similar solutions to openly share their research, schematics, and designs.
I assume the French guy that richie refers to is the person selling the LED displays on eBay and Reverb. Again, I don't expect that he will want to share his research and work with a stranger on the internet for free when he is already attempting to run a business by supplying LCD solutions himself. However, it doesn't hurt to try. I'll reach out to him this weekend and see if he wants to share information.
It's frustrating because the internet is full of solutions to convert vga and hdmi to lvds. So there's lots of solutions to make modern video signals backwards compatible with old displays and tv's, but there's hardly any solutions to make old video signals forward compatible with modern displays and tv's. If I wanted to convert an HDMI or VGA signal back to a LVDS signal, I'd already have a working solution the market readily provided. There's no way that I know of to reverse the signal path and conversion on these ready solutions.
Also worth noting is that modifying a laptop display, which is native to LVDS, might be an easier solution than trying to output to VGA.