Sounds odd to me. The fact that the other TV's work OK suggests it's not the DC or your Scart cable so I guess the issue may be the JVC TV itself. At least that seems the most logical thing based on what you've mentioned. If you have a mate with a DC Scart lead, you may want to try that one just to rule out that it may be the lead or connection. Are there any damaged pins in the scart socket perhaps?
Other than that I could only suggest trying the DC on as many different TV's as possible and if it still only does it with your JVC, then it it's probably something to do with the tellie itself. Maybe someone a bit more techy might help.
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