NFG Games + GameSX

Japanese 21-pin RGB connector

The Japanese RGB-21 connector, also known as EIAJ TTC-003 apparently, is identical in appearance to the European SCART (or Péritel or Euroconnector). The pinout is completely different however. There's an RGB← →SCART adaptor pinout here.

Simple version

Pin	Description	Pin	Description
1	Left audio	2	NC
3	Audio shield	4	NC
5	Right audio	6	NC
7	Sync shield	8	NC
9	Sync	10	NC
11	+5v	12	NC
13	Red shield	14	NC
15	Red	16	1V*
17	Green shield	18	Blue shield
19	Green	20	Blue
21	Ground

*connect to pin 11 via 3.3k Ohm resistor. The resistor isn't usually necessary, and +5v on this pin will most often work.

Full Version

This version includes every pin, including a few you'll never really need to know. All labels are display-relative, so input means into the display.

Most of these pins can be safely ignored for most purposes.

1	Audio left channel input	2	Audio left channel output
3	Audio ground	4	Audio ground
5	Audio right channel input	6	Audio right channel output
7	Video ground	8	Video ground
9	CVBS input	10	CVBS output
11	AV control input	12	Ym input
13	Red signal ground	14	Ground
15	Red signal I/O	16	Ys input
17	Green signal ground	18	Blue signal ground
19	Green signal I/O	20	Blue signal I/O
21	Plug shield

Special Notes:

Audio Input: 0.40 mVrms, > 47K ohms
Audio Output: 0.40 mVrms, > 10K ohms
CVBS (Composite Video) in and out: 1 Vp-p, 75 ohms, sync: negative
Ym Input: Switches RGB to half-brightness, for video overlay (L: < 0.4V, H: > 1V, 75 ohms)
Ys Input: RGB in/out: (Ground for output, 1V+ for Input (preferred)¹⁾)
All RGB lines: 0.7 Vp-p, 75 ohms

The detailed version was found on this Korean page

¹⁾

A lot of displays won't show RGB at all without Vcc on this line