Sony Trinitron
If you cut the blanking and let it float you get RGB blanking but with the menu VIDEO 1 on screen also.
If you apply voltage at around 3v it changes to composite.
But if you ground blanking you get RGB without the OSD always displaying the channel number

EDIT Grounding blanking makes the OSD barely visable but stops the TV from turning on ffs..
Update
Ok so I figured out the bloody thing.
Sony CXA2139S
Around 3v or more to the ext blanking pin turns on RGB.
Pressing DISPLAY on the remote removes the OSD..
Seriously WTF?
Why would Sony make it so every time you turn on the TV you have to press DISPLAY on the remote to make the OSD piss off?
If you didn't have a remote you'd be screwed.
Funny thing to note, Ive been getting confused between RGB and composite today on a few tvs and I finally figured out why.
I'm using an old SNES to test not my Famicon Jr.
The difference in RGB quality on these 2 consoles is night and day.
To my eye an old SNES looks closer to composite than it does RGB due to the blur
Sweet picture tho
