52 " panasonic HT-50pz80u 2008 no picture when i first turn it on in the?

There will be a cold problem - something inside - an electronic component - does not work properly until it gets to be above a certain temperature. Very probably in the circuitry that deals with developing the incoming signal.

A service engineer might use circuit schematics and test equipment to discover the fault - another approach might be to use freezer spray to cool selected areas to try to bring the fault back.

Good Luck...
March 2016