I stumbled upon a faulty Spectracom NetClock 9483 recently that I've just started to troubleshoot.
The u-blox M8T GPS module checked out, as did the internal battery & memory module etc. I tried the serial port but wasn't getting anything out of it.
I haven't come across this before in an appliance but socketed in the main mainboard is a SOM-4455 - System On Module - containing an AMD CPU, memory socket and a bunch of IO interfaces.
I spotted what looked to be a VGA connector on the mainboard near the SOM module and plugged in a monitor just for fun - here's the result:
Quite cool to get a picture up on the screen. I tested the CF card externally, and sure enough - it was stuffed.
I plugged a keyboard in to the USB port on the back of the appliance and was able to use it to get into the BIOS as well:
I read a few of @SoundTech-LG's posts about these units and reached out for help and they found the internal VGA connectivity quite interesting like I did and worth a post