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Hi there, sorry to hear you're having trouble with the tv,
unfortunately, we see this type of problem quite often, and it is almost always an internal hardware failure which requires repairs to correct.
The symptoms that you are having with the sound staying on but picture going out, as well as the shutting down tend to indicate that one of the display components or power supply components are failing.
The shut down is an indication of a short or fault that the set is detecting, and turning itself off to prevent further damage.
This is something that we can troubleshoot and look into repair options. If you're looking to fix it yourself, you'd need to be experienced with electronics repair, have a multimeter, be able to solder, etc
For this type of set, you can typically manage a do it yourself repair for $200 or less.
Having a local shop do the repairs, you'd be looking at $300+ on average to change out the power or display drive components
Because of the age and size of the set, most any of these costs quickly become unpractical, considering you can buy a new set in the $250 range, that is usually the smartest investment.
If you think this is something you'd want to do yourself and want some help with finding parts, or if you want help finding a local shop, or a recommendation replacement, just let me know, and I'll guide you further.
Still with me?