Nowadays the raspberry pi has become a very useful device, but there's one problem when you need to connect it to an analog TV, because new versions had eliminated the AV out from the board. But this change wasn't radical, the raspberry pi b+ has the capability of AV connection by the 4-pole socket. Often this connect could be found in the smart phones audio connection. So that is what we are going to use, an old or broken earphones 3.5mm jack.
First of all you need to cut the wire, and separate the cables from each other.
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Step 2
Once you have separated the cables scrape each one with a sharped object in order to remove the thin layers that cover the cables.
Now with the cooper wire visible, you need to put some soldering iron on the tips. That makes the earphone cable stronger on the tips and also you could solder it easily.
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Step 3
At this step you must test the continuity of the cables, and try to find which one belongs to the VIDEO (4) and GROUND (3), as it's explained in this diagram:
To test continuity your multimeter must be selecting the diode:
When your multimeter shows:
That mean there's continuity, and that cable is connected to that segment of the 3.5 mm jack.