Studio Spot 250 Lamp Flutter

Hi Guys
I Have a Studio Spot 250, that is giving me Lamp Flutter,(Lamp is slightly pulsing in a strobe like fashion).New Lamp (twice) and I have swaped the Ballast, the Ignitor, the Transformer, the Lamp Base.When I moved the Logic Board to a new Unit, the problem Followed so I feel pretty sure it is the card ,my question to all, is what do I look for on the card that may be causing this problem.
Any Idea's would be much appreciated

Thanks and regards J.P:confused:
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