Okay, thank you. The power supplies in these later model Samsung TVs have been failing rather quickly and can cause the problem you are seeing (it's very common). If you are comfortable working inside the set, a replacement power supply is available from www.encompassparts.com; however, it is always a good idea to first confirm a bad part with appropriate test equipment (multimeter, oscilloscope, etc.).
There were two slightly different power supplies used in these sets, part numbers: BN44-00191B and BN44-00208A. Here is a photo of the power supply (BN44-00191B):
The actual board used in your set will be labeled on the board itself (usually near the edge). Here are two examples:
If the original board in your TV is part number: BN44-00191B, please use substitute board BN44-00192B. This part is in stock at Encompass for $62.51 (after returning the old board). Here is a link to the part page:
If the original board in your TV is part number: BN44-00208A, this part is also in stock at Encompass for $52.93 (no need to return the old board). Here is a link to the part page:
If you were to have this part replaced by a servicer, the labor should be in the $75-100 range (in my area).
It is also possible that only
the electrolytic capacitors on the power supply are bad (very common on Samsung). If these capacitors have swollen or dried, simply replacing these may repair the power supply. If you wish to repair this yourself, soldering equipment and very good soldering skills are required to change these parts. Also, most of these TVs are now using lead-free solder for assembly.
If a local shop were to replace just the capacitors, the repair cost should be in the $100-150 range (in my area). Repairing the existing board is preferred (if possible) because a replacement board may have the same quality parts that failed so quickly the first time. If only the capacitors are bad on the board, these can be replaced with a higher voltage, higher quality capacitor for much longer life.
Of course, it never hurts to call Samsung to see if they will extend your warranty since so many of these TVs are failing. Being insistent
may help (hint): 1-800-SAMSUNG
Please let me know if you have any questions, or if I can help in any way.