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I would start with checking the power supply 12vdc output, make sure it is stable with no ripple. If the power supply checks out fine, I would then suspect the main board.
No display on all modes? If it is, you have a lemon set, I would take it back and buy a better brand instead. Emerson is a cheaply made TV. I myself prefer PANASONIC.
If everything else works - there is sound and high voltage (static on the screen) - but there is no picture (including no on-screen menus), this limits the likely area of problems is the video output circuitry or CRT filament connections. Check to see if the CRT filaments are glowing. If they are not glowing, check for bad soldering on the CRT neck board and around the flyback transformer.
Where the picture is erratic - coming and going entirely or changing brightness suddenly, with power off, remove the picture tube socket (carefully!) and clean the pins with fine sandpaper and use contact cleaner on the socket. This source of bad connections can result in a variety of erratic symptoms. Check for bad solder connections on the CRT neck board.
well tuners are being made smaller (and there is more cold solder in some points due to heat) so i would look up a new tuner for that tv...and if you know how to solder ,do it yourself it will be cheaper
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