Same thing here... I was starting to think I was alone
My PAL PS2 is also connected to a Samsung 32" S86 LCD TV via a component cable. The interference you are talking about is more or less noticeable depending on the predominant colors onscreen. It's rather annoying, for instance, when playing Haunting Ground, but almost invisible with many other games.
Some days ago a friend of mine drop by with his XBOX 360 and things just got even worse on the 360 with the same componente cable.
I also have a pair of Homeplug 85mbps PLC network adapters at home and I figured out that the interference rose to an unacceptable extent when they were actually transmitting data and completely disappeared when unplugged... so you're right, the source of the problem must be electrical.
All my gear is connected to a surge supressor that seems incapable of filtering this thing out, but I've been able to greatly reduce the interference by connecting (only) the PS2 to an old UPS I had at home (even though the battery is damaged and cannot keep the energy in case of a blackout).
At this moment the interference:
- Is not visible when PLCs in standby (but alive).
- Barely noticeable when PLC transmitting.
Bad news is that if I configure the PS2 for 480p, 720p or 1080i output (my TV doesn't go higher than that) interference is back, specially in the latter two.
I am going to try removing audio cables as you advice (I remember having heard strange noises coming from a nearby hifi amplifier when the interference was most evident) and tell you what happens then.