A few years ago, Eddy Foucault invented a video mod for the Atari 2600 SECAM version, which adds a a SCART socket video output to the console.
You can find his very well documented project on his blog, which I recommend.
With his permission, I made the PCB he had designed. Thank you Mr. Eddy!
This video mod works for the Atari 2600 SECAM version only, it is not suitable for an Atari 2600 PAL or NTSC.
The mod is supplied with all necessary components already soldered. You’ll also need to solder wires between the mod PCB and your Atari 2600 motherboard console. This is a delicate operation, not recommended for beginners. I suggest you use thin wires, like AWG30 type (not supplied).
You will still need a cable and a SCART socket for this project (not supplied).