I'm going through quite the ordeal with my Sony KP51WS500. Not surprisingly, it developed the infamous "flicker" problem. The CRTs have been replaced, but ever since then my convergence will not hold and keeps drifting even after short periods of time. This is also affecting geometry. I joined a Yahoo group for Sony HDTV owners and one of the ISF techs who is a member there seems to feel there is a problem with the static set up of the CRTs. He tells me that the values for Center and Skew in the service menu should be in the low double digit range. The Skew values are in that range, but the Center values are in the 250+ range, which he felt was indicative of a problem with the static set up and is likely what is causing the convergence to drift. The problem is, I cannot get any of the techs who have come here to do warranty service to even consider that this might be the underlying issue. Two of them have claimed that the static set up and CRT focusing would have no impact on whether or not the convergence holds. As such, they will not even look at that. The tech who was here today theorized that the problem lies with the convergence circuitry and that it is merely a remakable coincidence that this problem started at exactly the same time that the CRTs were replaced. Obviously we have two conflicting opinions. I'm starting this thread in the hopes of getting some feedback from others who may have experienced this problem as well as hopefully from some of the ISF techs who are members here. Help me out please, guys. I'm at my wits end with this thing.