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Verify is you have 100vac at the outlet behind the refrigerator. If you do not then you need to restore power to the outlet. The refrigerator will stay in LP mode until it detects good shore power.
If it struck the screen or near it the display panel (screen unit) may be damaged inside---fatal as the part alone costs more than a new set and if set was on or turned on after that damage may now extend to a board or boards inside the set.
I suspect you probably have a bad LED assembly. It could be either the red, green or blue that is bad and give you the same symptom. The problem is locating parts for it as it looks like the light engine is no longer available. I would have a technician look at the TV to verify this and what parts are needed for repair.
The 6 inverter transformers on the bottom of the picture is the problem and what need to be tested.
Unplug the 6 wires that goes to the LCD screen. Use a multimeter to test for resistance from each output plug on the board. The one without the resistance is the bad one.
If this doesn't locate the bad one this way, Each plug should give out DC voltage if working properly. Test each plug for voltage.
The TV will automatically turn off in a couple of seconds like before. You'll have to keep pushing the power button to test each output plug for voltage.
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