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Hi there, sorry to hear you're having trouble with the polaroid,
This is unfortunately a common problem among LCD tvs,
since you are getting sound, but no picture, this indicates a few possible problems. Either the inverter board which powers the backlight (think of it as a ballast system that a fluorescent light would use) has failed, or the panel (screen) itself (or the connection tabs to it) has failed.
While these things can technically be repaired, for a set this age and size, it will not be reasonable to do so. You'd spend $300+ for parts and labor, while a new tv can be found for $150-200
Magnavox 19MD301B/F7 19-Inch 720p LC... (click for link)
If you'd like to pursue repairs anyway, I can try to help you find a local shop, but typically most shops won't work on Polaroid sets, because this is a 3rd tier brand (they don't make their own components - it is made by someone else and rebranded) and they usually can't get parts for them.