My Mitsubishi 55907 made it 7 years before a problem. It lost the convergence amp. This turned out to be a cold solder joint between the leads to circuit board. A few hours of careful work to remove the main board and a re-solder of the multi pin IC did the trick. This repair and careful calibration made the set as good as new. This set is a keeper.
Regards
Jerry
Regards
Jerry
