I have a Toshiba 36A43 TV. Sometimes when I turn it on the picture will not be complete like its garbled some. It flickers for about 15 seconds or so and then the picture stabilizes and it will then be OK. Color is garbled up during this time also.
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If you can get the tv to display the blue blackground(usually happens when there is no antenna or cable feed to tv) check to see if the whole screen is a solid blue, if it shows discolored areas around the screen then you might have to "demag" the screen. See if you can rent a demad coil from a tv shop and with tv on turn the coil in circular movements all over the front of screen till blue is solid.good luck!
on startup a television is subjected to severe inrush currents this sometimes results in a blown fuse in the psu stage most often at cold startup...this is the place to start...remove and test psu fuse...take precaution when working on tv as many high voltages exist sometimes even long after power is turned off...avoid the high voltagte thick red lead going into the tv tube or discharge if required the same applies to any high voltage reservoir capacitor/s in the psu stage