I recently had a problem with a 58" samsung TV that blinked 6 times. I opened it up. All the voltages on the power supply board checked out ok. Turned out that it was the LED backlight strips that had burned out. The LED's on these strips are connected in series. When one burns (open circuit), the rest on the strip won't light. Got some replacement strips, spent a couple hours pulling the TV apart and replacing the strips, put it back together and all is well. I've read that the LED's on these models are prone to burnout when you set the brightness to maximum (20). Turn down the brightness to 15 or 16 and it may prolong the life of the LED backlights on your TV. Be careful when checking the LED connector voltage, it runs at about 300V DC. Sounds high but the LED's are connected in series - 3V each times 14 LED's per strip, times 6 strips = 252V
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