I have a Toshiba 57HX83 and originally at start up it would have a distorted blob in center of screen (convergance off and image magnified only in center of screen). A few months a ago it would go away when the set warmed up and it was turned off/on. Now it seems it won't go away no matter how long the warm up period is. What can it be? Attached is a picture. Thanks
You will find a detailed discussion of the nature of your problem and some specific suggestions for repair. Pay particular attention to finding bad solder connections in the Toshiba, as well as using chips from a quality supplier.
You can find the SM at elektrotanya (I am a new member and cannot post the actual link, but it is a com site). Non registered users are able to download two items per day. I have a different toshiba set and was able to find my manual there. I'm still trying to figure out my set's fault, but it was not hard to get the boards out and replace the convergence chips.
The service manual will help with disassembly and locations of parts, etc.