Why do you guys post such crap when you really don't know.
First of all, TP55F81 is a Toshiba model number. There is no Mitsubishi of
this model, at least not marketed in the USA. You can buy the Toshiba
manual from distributors such as Tritronics for $15.00. If it was a
Mitsubishi model, their manuals or either $40 or $50 retail to consumers,
half that to a dealer. Most manuals are not $100. Some require service
subscriptions and specific software, but other than those, most manuals are
not in the $100 range except Pioneer service manuals. Most are $15 - $50.
These generic replies that give no good information or are just plain wrong
are getting old. You guys who post here all the time should have better
things to do than waste your time and mislead others. If you are not
familiar with a specific model, why reply?
The OP should check his make and model. If the model is correct, it could
be anything from a cold solder joint to a shorted CRT. The set needs some
diagnosis before much can be said.
The service manual may not tell you much if you are not an experienced tech.
Often the training material, if available, will be more useful but are
generally less likely to be available.
Leonard