SCART confused (sync signal & type)

[Oneminde]

Intro.
Lets start with the reason for me writing this thread. I am working on designing/building an ultimate arcade machine and I picked up a 32" 16:9 CRT SONY Trinitron TV (SD CRT) made in 2005, so one of the last and this one have not been used for years, so near mint. The model is; SONY KV-32FQ86E. so this is the model I will use in my arcade (RetroPie). So basically, I will use a Raspberry Pi 3 as the computer (ROM emulator), connect the HDMI port to a converter (HD to SCART) and connect to the TV. So any game console issue is redundant in terms of video signal. The goal is to understand which composite video signal the TV accepts or work via.

The Issue.
I stumbled upon a YT channel called: My life in gaming, and they have a video series about RGB and Sync [RGB103 :: Demystifying RGB & Sync - MY LIFE IN GAMING]. Basically, there are different ways of showing the signal on a TV and it is this bit that is kinda confusing when I am reading some info on the different RGB & Sync types available in conjunction with what info is available in the Service Manual for the TV. So lets start with component video sync.

Component video sync / Composite Video (RGB Video).

First we have the obvious, red, green and blue is sent via its own cable, then there is the RGB Sync-on-Composite. If we look at S-Video, that one use Sync-on-Luma + Chroma for image, YPbPr Component Video use Sync-on-Luma + Pb + Pr compared to SCART which use Red + Green + Blue + Sync-on-Composite and it is this that make SCART superior compared to S-Video and YPbPr. But as that is not enough, there is also Composit Sync / CSYNC. Composite Sync have Red + Green + Blue + H+V Sync [Horizontal + Vertical Sync]. Combines horizontal and vertical synchronization onto one pair of wires. When used in RGB connections, four separate signals are sent (Red, Green, Blue, Sync).
So we have Sync-on-Composite and Composite Sync, out of these two, the Composite Sync is the one to have/use. Apparently, Sync-on-Composite introduce artefacts (chequerboard patterns) overlay on the video. Composite Sync / CSYNC does not, so a much cleaner signal. CSYNC is also known as Raw Sync / Pure Sync and Boosted Sync.

Here is a list of all the sync types.

Separate sync: Uses separate wires for horizontal and vertical synchronization. When used in RGB (i.e. VGA) connections, five separate signals are sent (Red, Green, Blue, Horz. Sync, Vert. Sync).
Composite sync: Combines horizontal and vertical synchronization onto one pair of wires. When used in RGB connections, four separate signals are sent (Red, Green, Blue, Sync).
Sync-on-green (SOG): Combines composite sync with the green signal in RGB. Only three signals are sent (Red, Green with Sync, Blue). This synchronization system is used in - among other applications - many systems by Silicon Graphics and Sun Microsystems through a DB13W3 connector.
Sync-on-luminance: Similar to sync-on-green, but combines sync with the luminance signal (Y) of a color system such as YPbPr. This is the synchronization system normally used in home theater systems.
Sync-on-composite: The connector carries a standard composite video signal along with the RGB components, for use with devices that cannot process RGB signals. For devices that do understand RGB, the sync component of that composite signal is used along with the color information from the RGB lines. This arrangement is found in the SCART connector in common use in Europe and some other PAL/SECAM areas.

The SCART.
Looking at the pins of the scart cable, pin-7 is blue, pin-11 is green, pin-15 is red and pin-20 is sync.

On page 4 in the SM;
Scart 1 or AV1; 21-pin Euro Connector (CENELEC STANDARD): Inputs for Audio and Video signals. Inputs for RGB. Outputs of TV video and Audio Signals.

Scart 2 or AV2; 21-pin Euro Connector; Inputs for Audio and Video Signals. Inputs for RGB. Outputs of TV Video and Audio signals. (Monitor Out).

Scart 3 or AV3; 21-pin Euro Connector: Inputs for Audio and Video Signals. Inputs for S-Video. Outputs for Video and Audio signals. (selectable), Smartlink Interface.

On page 6 in the SM;
Here I can see the 21-pin layout and feature and as far as I can see, only AV1 have connected RGB pins while AV2 & AV3 is not connected (open). Remembering that SYNC is carried over pin-20, here SONY writes: Video input: 1V +/- 3dB, 75 ohm, positive sync 0.3V (-3 + 10dB). AV1: Pin-16: Blanking input (Ys signal) if that matters

Page 42 show a schematic called: C Board Schematic Diagram [R-G-B Out) which has dedicated RGB channels connected to the picture tube - I think this is called a "Neckboard" and is located on the tube itself.

Page 44 shows the: J Board Schematic Diagram [AV Scart I/O Switching and Sockets which display the SCART input, here, only AV1 have RGB + Video In clearly marked on the schematic but AV2 also have RGB + Video In connected on the SCART as well, just not marked on the schematic.

Basically, this is it in terms of information regarding Sync-on-Composite and Composite Sync.

The Question.
Based upon information available, what SYNC type is used in my SONY ???

[g5k]

@Oneminde just found this thread after replying to your other post with the UMSA. Did you end up going that way or this. I ask as I've only found HDMI SCART adaptors that are composite not an RGBs option.

I'm going into SCART on a B&O MX4002 TV. That is looking for RGB composite sync (I think from my reading). Very keen to get a true RGB path and 240p for all the scanline goodness.

I gave up trying to find a HDMI to RGB SCART adaptor so have gone HDMI to VGA to UMSA to TV. I've also got an Extron Rxi 202 lying around in case the plan A doesn't work. They can take the VGA H/V sync and output whatever type of RGB sync you need via BNC. Can also convert 480i to 240p with a dip switch on the Extron.

I'll post back once my UMSA is in the chain with results but keen to hear how you've got on.