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Old 03-19-2017, 10:20 AM   #32
heavymachines
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Join Date: Mar 2011
City & State: Muskegon, Michigan
My Country: United States
Line Voltage: 120VAC 60Hz
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Posts: 1,026
Default Re: Hitachi LE55A6R9A - No backlight

i believe it works like this....If you have a very high voltage spike going to leds then that is a very strong indication there is an open led because it won't turn on to draw that power to put a load on it and draw to normal voltage ranges approx 1XX volts. When power supply detects this over spike high voltage it goes into protect mode and shuts it down due to open (blown) leds.
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