I bought this TV used, it seems to work well, I have already replaced the lamp once, that did the charm with a dimming problem.
About 50% of the time when I turn on one particular channel though, the TV will immediately freeze, and I have to unplug it, plug it back in, then it doesn't cut all the way back on. Then I unplug it, plug it back in again, and I have to turn the channel as quickly as possible to prevent it from freezing. It has that problem only with that channel, and I do believe it is the weakest signal that my TV consistently picks up (with an antenna).
On any channel, sometimes my TV freezes, and then cuts itself off, and back on again, for no apparent reason. That's comparatively much more rare.
Sometimes in association with these events I can hear the ballast burning, but that shouldn't be a lamp problem, it seems more like a reception-related problem to me.