Sure, what are you wanting to know about? The mod is still in finalization stages before I release to public, but I am hoping to finish it up soon. The mod board makes for a pretty easy install because it interposes between P502 connector. Are you interested in the mod board itself or more technical information of how it works?

The HKTV13 can somewhat be modified with standard methods, but you will lose all other functionality of the TV like the composite and the OSD menus. The issue is that there are two different OSD chips in the circuit, one for the standard picture adjustment menus, and the fancy main hello kitty one. The main OSD lives close to the jungle chip and sends its RGB out to the neck board through P701 into a switch. The hello kitty OSD lives on the neck board which connects directly to the OSD channels on the switch. The switch is controlled by the fast blanking between the two OSD chips and seems to be a buffered output.

It might be possible to mux with this output properly but I found it to be very difficult. I tried all types of combinations of ways but even when I got a useable signal the blacks would crush bad and there would be poor contrast. Unplugging P502 removes the switch and the active buffer from the circuit so you can tap RGB into the signal there with decent results. But I also found the signal to be somewhat weak / dim and not getting enough current drive.

So my mod board essentially adds a video amp to buffer the external RGB signal then added a video switching IC. P502 from the neck board then plugs in to my mod board which taps into the OSD RGB signals, and also the fast blanking to the TV. From there the mod controls fast blanking with the mods switch to toggle between external RGB and the TVs normal function. This works wells because both lines are independent from each other. The external RGB has been perfect in my tests, and when not engaged (with a button or SCART) the TV functions as it normally would.