Changes

This project involves opening and modifying a device which uses 240V AC. If you don't know what you're doing, then leave it to someone who does. Although the modifications do not involve the high-voltage areas of the circuit, extreme caution should be taken at all times and the unit should always be disconnected from the mains supply BEFORE the casing is opened and only re-connected after the case has been closed again.

Using a short length of coaxial cable, we need to tap off the composite signal at the two points shown in the picture above. The outer shield of the coax cable should be twisted tightly and pre-tinned with solder beforehand, to ensure that no stray strands of the shield cause a short circuit. The shield is soldered to the earth track or the RF casing (Point A). The centre core of the coax is then soldered to the composite output of the circuit (Point B). Next we need to mount a female cinch socket. You can either use an inline connector which can be mounted on a fly-lead outside the casing or a surface mounted cinch socket which is mounted directly in the casing. I chose a surface mounted socket, because I find the solution neater, but you may prefer the fly-lead solution with female inline connector or an even longer fly-lead with a male cinch connector for direct connection to the TV. It's up to you. If you are using a surface mounted socket, it is also possible to use two normal wires to make the connection, but you should twist these around each other to avoid interference. When drilling holes in this type of plastic, a wood drill-bit should be used on a slow speed so that the plastic doesn't crack or melt in the process. Once you have made the connection to the connector / socket, carefully return the circuit board to its original position and replace the three mounting screws. Fortunately the circuit board is mounted at a slight angle, which means there's plenty of room for the additional connections. Make sure the new composite circuits are routed well away from the power circuitry and the transformer on the right, as a short circuit between these circuits would not only cost you your MP1/2 but most likely destroy your shiny new plasma TV along with it.