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I suggest an authorised Samsung repair agent, (a list can be found on the Samsung web site), otherwise you will get panel changers and not engineers that repair to component level. One common culprit of this issue power supply issue, caused by a faulty power supply unit or the TV not receiving enough power, caused by faulty electrolytic capacitors on the Power Supply board.
1. disconnect the cable between the power supply & the main board, if no back light, replace the defective back lights LED strips inside of the panel.
2. If the back light are light up, i will try a new main board.
It sounds like the main board has failed however there is also a possibility that the power supply is the cause; there are capacitors on the power supply that can cause a lot of issues like this
Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its 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. Surf the site with patience. 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.
Power supply board is dead.That the board,the power a/c cord go into it.Replaced the power supply board will solved ur tv power lite LED light indicator blinking and ur tv power will be stable and work again.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
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