For anyone wanting clarification on how to connect a Sega 192x64 system together. Make sure you have everything you need before you begin building your kit:
17.3" LCD display panel
DMD Extender board
DMD Extender power cable, Z connector, ribbon cable, and SD card (all included)
Raspberry Pi board model A or B
1 ft HDMI cable
HDMI to DVI adapter plug (pictured but may not be needed, details to follow)
LCD controller board
12v (4a or higher) power supply
Connect the small 14 pin connector on the DMD driver board to the DMD Extender's "DMD IN" socket using the supplied ribbon cable. Be sure the red stripe is on the side marked pin 1 on the DMD driver board and on the left side when plugged in to the extender. With the game off, plug in the power connector on the DMD driver board.
Turn the Raspberry Pi board upside down and carefully insert the GPIO header on the board into the corresponding socket on the DMD Extender board. Connect the included power cable to the "POWER IN" plug on the Extender board. Unplug CN2 on the sound board and connect the other end of this cable in its place. Connect the Z connector to the center plug on the power cable, and connect the plug that was originally attached to CN2 to the opposite end of the Z connector. Insert the SD card into the Raspberry Pi's SD card slot, and connect one end the HDMI cable to the Pi's HDMI out connection.
Connect the other end of the HDMI cable to the LCD controller board's HDMI input. If the model you received does not have an HDMI input, use the pictured female HDMI to male DVI adapter plug to connect to your controller board's DVI input. The remote board and LVDS harness will already be connected to the controller. Attach the flat LVDS connector to the display's socket on the bottom. I would suggest taping down the black sleeve protruding from the contacts like shown to prevent it from wiggling loose during installation. Finally, attach the 12v power supply's DC plug to the controller board's power input connection.
Plug in the power supply, turn on the game, and the DMD Extender logo will display briefly on the screen followed by the game's DMD image.
In this case the display panel I received was unfortunately damaged by (guess who) USPS, and I did not have access to a PC to configure the SD card for "large Sega" mode. Other than those two differences you will get a good starting picture, and from there you can insert the SD card into your PC and use the included utility program to customize the image, as well as make further geometry and position adjustments using the LCD controller's included remote board.
This, in a nutshell, covers everything on the electronics/connection side of things. If you want a full guide on how to assemble these parts together properly, check the below links.