I already have a tool to open gaming consoles and cartridges. When you find a way to open your SNES, remove the screws that hold the board to the case. Now flip the board over and locate the A/V Out, twelve pins, two rows of six.

Pin 5 is your video out and pin 12 is your audio out. Ignore the colored marks, I sharpied those there as a reference to myself.

Now you need to get two RCA female jacks. I took my two from an old video conversion cable. You need approx. five to six inches of cable on each jack. Strip them and tin the wires in preparation for the next step.

Now find the oval hole next to the heatsink. This is where you're going to pull the jack leads through. It was a tight fit for the cable I used, but I managed to get them both in.

Pull the jacks down as far as they will go, you'll need the slack.

This is what it should look like with the wires through the hole.

Now that you have the wires through, you'll need to locate the pins again.

Video is Pin 5
Audio is Pin 12

Carefully solder the cable cores to the respected pins making sure that your colors on your jacks match where you're soldering. Yellow is standard color for composite video, and white is standard for left channel audio.

Theres a little bubble of solder next to pins 5 and 12, make sure that you do not solder those! Now clip/cut the extra end off the core and make sure nothing is touching anything it shouldn't.

Now take the two grounding wires and solder them to ground on the power insert. Make certain nothing is going to touch.

Now we cut holes to fit the jacks through. I drilled a small hole and then cut the rest of the hole opening with an X-Acto knife.

Pull the jacks up gently to return the slack you gave for soldering. Apply some hot glue to the base of the board. Hold the jacks in position until the glue sets. Then take and apply hot glue over the jacks and let set, you may need to hold the jacks down with a screwdriver to keep them in position.

I used hot glue, you don't have to, if you have another way to fix the jacks then thats fine. You may need to gently press the capacitors to the heatsink to fit the jacks in.

Your SNES backing should look like this.

Now label your jacks so you know where to plug things in.

Reassemble the board to the case and attach the top. There you go. Happy gaming!