Info:
http://books.google.com.au/books?id=53nnX4fnnNIC&pg=PA220&lpg=PA220&dq=b-y%2C+r-y%2C+g-y+chroma&source=bl&ots=1udP3jnpaL&sig=rntO3MGxEeoK2435_mruSWo6zhs&hl=en&sa=X&ei=qFxzU_LKLIyPlQWxt4DwCw&ved=0CCgQ6AEwAA#v=onepage&q=b-y%2C%20r-y%2C%20g-y%20chroma&f=false
There seems to be 2 circuit paths:
One that takes R-Y, B-Y, G-Y and Y and then matrices the Y into the R-Y, B-Y, G-Y. This is done apparently so that the amount of Y added can be adjusted per colour. The output of this circuit goes into the R, G, B pins on the electrode gun. There are two more pins for earth and a heater?
The other takes the Sync and Power. There appear to be 3 syncs. SY, DH, DV. These are used to control the CRT deflectors.
So...
Feeding RGB + Ground from the CRT circuit and SY from the Input into the RGBS input of the converter produced no result. But I could have ruined up the CRT circuit when I was removing it.
EMV Computers: http://mz12gt.com/?p=293
Plan:
EMV Signal -> Converter Box -> ALR-1400 Controller -> 5.7" TFT
Parts:
Signal Interpreter: www.arcadespareparts.com/arcade_parts/video_converter/rgb_jamma_vga_converter_board/13052.html
ALR-1400 LCD Controller: http://www.digitalview.com/products/alr-1400-tech-specs
LCD Display: http://www.sharp.net.au/cms/articles/439/files/LQ057V3DG02%20LED%20BL%20%28TL%29.PDF