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If you're TV is under warranty call the Samsung.co.
If not than open the back of the TV and look at the motherboard and the power board for blown capacitor's swollen or broken off and replace those capacitor's you can use the same power capacitor or a higher power capacitor.
My Samsung 50 inch had the same problem. Searched the web and it was the only capacitor in the power board that needed change, voltage was 382 volts. Replaced the old 100 uf 450 volts capacitors with two capacitors 150 uf 400 volts and 220 uf 400 volts in parallel and measured the high voltage at 390 and the TV was back to normal. (Make sure the capacitors from an old TV and computer power supply is rated for at least 400 volts.
Capacitors are blown. I have repaired a few of these. Samsung is known for putting capacitors in that are just big enough to run the TV. They last about 1 to 2 yrs and then blow. Check out youtube and see what there is on there. I replaced all the capacitors on mine. There were 11 of them. I put in a slightly larger capacitor size. It works well and has been for 2 yrs now.
That problem is usually cause of faulty capacitors on the power supply board..
Just follow this instruction to fix your TV..
1. Open the back cover of your TV. 2. Look at the power supply board..Its normally connected to the power cord.. 3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors.. 4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value.. 5. Some of the capacitors not bulged so its better if have a capacitance meter
I had the same problem with my Samsung LN26A450 LCD TV. I found the following YouTube video http://www.youtube.com/watch?v=Mm51C_RDIZE titled "Samsung TV Repair - Part 1 of 2) (also watch Part 2 of 2) which shows how to easily fix the problem. The problem is bad capacitors on the power supply board. My TV had seven (7) bad capacitors - all 7 had dark stains on the ends from leaking electrolytic fluid and one (10V 2200MFD) was blown with bulging ends. I ordered 7 new high-temp (105 degrees C) aluminum radial capacitors from DigiKey.com matching the Temperature, Capacitances and Voltage Ratings for each damaged capacitor that I removed. I followed the instructions in the video except I used desoldering braid ($3.99 at RadioShack) to remove the solder attaching the bad capacitor leads to the power supply board. Once you wick up the old solder from all sides of each lead wire using the desoldering braid, the bad capacitors are easily removed. Total cost of repair including soldering equipment was less than $50. Thanks to “The Professor” for posting the video and saving me $400.
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