Taking currency differences into account, you are talking about spending £5 UK on component leads? It's not surprising you have a wee spot of trouble! They're probably made of string for that. £40, or $70-$80 will get you a set that will be hard to visibly improve on, a good price point in my view. QED make one that I use as custom install interconnect for that kind of money. Just get one in your hand, and no more need be said! But I'll say it anyway, for the record. Video needs precise resistance in the cable, we describe it as 75 ohm interconnect. Ideally it should be BNC connectors on both ends, not possible with your plasma, so phonos properly attached, high quality conductor, insulator and shielding is what does the trick. Poor shielding can result in a grainy appearance due to interference from any neighbouring cables, especially mains. Try to keep them separate as much as possible, and where they must cross, do it at 90degrees, not a birds nest.