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Remove the back cover, test the panel and power supply board by disconnecting the cable from main board. If unit's backlight comes on the main board needs replacing. If the backlight does not, the power board needs replacing
Lamps in the panel are bad...DON'T order the power supply like someone says on about every post he answers before testing the LED lamps or you will waist a lot of money.
Hi Rick,
It appears to be a case of backlight failure. since you have replaced all the boards, inverter is ruled out. Some of the LEDs in the backlight array may have gone bad. Fault is repairable, but needs care and experience of opening and repairing the LED panel. Good luck.
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