Facing TV Problems? Ask a TV Technician.
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Hi there, sorry to hear you're having trouble with the samsung,
there are several possible causes of this issue, which could be insufficient output from the power supply board, a failing inverter (which powers the backlight), or even a bad panel.
In general, for a set of this size and age, it wouldn't be worth fixing, if you have a local shop do the repairs, you'd typically be in the $300+ range, and as a rule of thumb for sets 42" or smaller, or more than 4 years old, repairs aren't practical.
If you wanted to try fixing it yourself, you could expect to be in the sub $100 range to buy a new inverter board for example.
Before doing anything however, I would suggest you call Samsung at 1-800-726-7864 because this particular model (depending on the purchase date) was covered by a class action lawsuit that stemmed from faulty capacitors in many tvs they made. So if you have a chance of getting repairs covered through them, that is your best bet.