How long have you had the unit?
If less then a year ,Take back to where you puchased it, if not you may open it yourself.
There is a Inverter Board that gives a Baklight.
You see LCD means Liquid Chrystal Display, but it need a light source to shine upon your display.
If you google your model on the net you will find many suppliers for this inexpensive item. Between 20 40 dollars
OK
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