A friend gave me this TV, she was moving. Convergence was a little out of whack. When I opened it, luckily there was a service sheet, telling me to hold whatever couple buttons in the front, and what to do and not to do. I got it working pretty good, then went into screen menu, #4-Adjust Projection TV--Got it working great! Here's the kicker. After a couple days,I moved it to other side of room. It rverted back to the way it was to begin with, I lost the service paper,--but get this--the #4 choice to Adjust is no longer on the screen menu!!!What could possibly explain that? It was there before, it's supposed to be there--where'd it go ????
Two things may have happened. First you may just need to degauss the CRTS. Let me explain when you move your TV you often cut across flux lines (magnetic lines of force) these have then tendency to magnetize your screen mask (a metal component in the CRT that slows down electrons) and cause what is sometimes misdiagnosed as a convergence problem. All that has to take place is a once over with a degaussing coil and the problem is fixed. The other thing that could have happened is the your convergence correction amplifiers have gone bad. This will require that you replace both modules (STK392-110). If you have a background in electronics you can perform these tasks, however if you don not have a background in electronics, I would suggest that you contact a qualified TV repair shop to service your TV set.
I hope this helps,
Thank You,
Shuttle83
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