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There is no warranty exists after an year. The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Sounds to me like something else is causing those parts to fail. It should be under warranty but depends on the repair shop. Why not just buy a new one.
At least you know the set does work. I'm also assuming your satellite receiver is working and that all your cables are good.
There are two ways to hook up to the TV: RF (antenna) and the A/V jacks. Maybe the seller was using the RF input (the threaded round connector where you screw on a cable connection, then choose channels with the set's tuner), and you're trying to connect using the A/V jacks (the red, white and yellow RCA jacks). If that's the case you need to switch the TV to those inputs. You may need the original remote to do that if the TV doesn't have a front panel TV/AV button.
The other possibility is you're connecting the satellite receiver to the RF connector and the TV isn't on the right channel (usually channel 3 or 4). If you're using the RF input, have the TV autoprogram and it should find the channel. Most sets can do that from the front panel menu button.
I have one in my shop with the same problem. Power is the only function that works. I repaired the power supply six monts ago. Now it looks like a bad digital processor board which is non-repairable. I can't believe what's happened to the tv business. Absolutely disgusting!
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