The TV turns on searches for channels. When switching between channels, there is normally snow and then a blue background. The menu normally works (you can see a slight tremor) and all its functions.
Audio works, searching for channels, satellites, teletext and menus. The tuner through the AV2 connector gives a normal picture. The matrix is lightly illuminated. Has anyone encountered similar symptoms? Is the matrix operational?
Please help.

Audio works, searching for channels, satellites, teletext and menus. The tuner through the AV2 connector gives a normal picture. The matrix is lightly illuminated. Has anyone encountered similar symptoms? Is the matrix operational?
Please help.