Bliking power light

It coulb be a connection problem on the SD or A board. Check all capacitors and connections there. Also, the power supply might need to be repaired or replaced - it sounds like the Y sustain board is bad (hopefully not though = expenxive to replace). ONLY IF YOU HAVE ELECTRONICS EXPERIENCE, disconnect the plug on the left side of the power supply and measure the VA voltage to see if the Ysustain took out the power supply board or not. The power supply board is right in the middle of the TV, and the Ysustain is on the left side. Measure that VA voltage on the left side power connection, but you MUST disconnect it first, before you measure it. You absolutely have to replace the Ysustain and Ydriver boards and your cost is about $400 - so consider buying a replacement TV - get an LCD with warranty - at least LCDs can be repaired on a component level, which is much cheaper than buying new boards. Plasma TVs are dooiuble sided boards, cannot be repaired on the component level, and VERY expensive to replace.
Good luck - Beach TV Repair, serving the Treasure Coast, FL area with In Home TV repair and Service.

Call for warrenty repair,the power supply board it dead.The components call capacitors it dying and leakage of gases.