I had always planned to do a post on how I did the LCD mod to my 8752C but never got around to it. I have since sold the 8752C but I still have notes on the mod.
I used a LED backlit 8 inch 1024x768 LCD screen with a VGA driver - $50 shipped from ebay
The 8752C video signal was converted to VGA using a GBS-8200 - $17 shipped from ebay
The stock CRT is powered by 65 VDC so I used a 120 VAC to 12 volt adapter that happily worked with the 65 VDC input to power everything.
The stock video driver has separate horizontal and vertical signals that need to be joined together for the GBS-8200 to sync, that is done using 2 gates of a 74AC86 XOR in DIP format. The AC version is used so it can be powered by the 3.3 volt supply on the GBS-8200.
The stock backlight in the LCD I used was a little weak and driven well under spec so I powered the LED backlight from the 12 VDC supply through 15 ohms of resistance.
The above mods let me keep all changes in the CRT unit only which is easily removed and connected only by a single ribbon cable.
The boards were mounted to a piece of copper clad that was cut to fit on the bottom of the original CRT cage.
The LCD adjustment button PCB was mounted on the top of the CRT cage - they are only used once for the initial setup, same with the buttons on the GBS-8200. Once setup the top cover of the CRT cage is screwed in place.
Here are two pictures, a top view looking into the CRT cage after the mod was done and of the LCD mounted with the original tinted shield glass installed.
I was very pleased with how it turned out. I wouldn't doubt the newscope LCD is even nicer but this mod was very affordable and still looks/works great.
Any questions let me know.
edit - added the correct schematic of the sync combiner I used.