SNES Pal Issue - Discharge sound on tv when turning off

[steamedcrap]

I've managed to track down a 1chip-02 Snes pal but the issue is when I turn it off a weird electric discharge sound comes on the tv, starting with high volume and decreases down to nothing over a few seconds.
There seems to be no audio/video problems at all while playing. I'm using a RGB scart of high quality which works great with my other two snes. Tried using two different ac adapters with no effect.
Anyone have an idea what it could be?

[Syntax]

Check which channel it's coming from, if both maybe a bad cap on a chip.

Either way sounds like a cap holding charge.