Hello Friend. At what stage of the tv. You have checked to try to fix the fault. and if you have the diagram pass it to see how I help you
Perform this step
https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.archivotecnicosaurios.com/descargas/tv/seccion_ordenada/12544_Panasonic_Chassis_GN3-GN3M_Protecciones_en_TV.pdf&ved=2ahUKEwix8421y9fgAhUiSN8KHX-iCZMQFjAMegQIAxAB&usg=AOvVaw1fv61QJ5SsNYLNBom0lVgW
And the tv took on for about 10 seconds and turns off ..... but it shows the horizontal line on the screen ... (vertical failure) .... I'll change that IC