Backlight not working, what to do?

It's for an Acer 5920. There is no other way for me to test the inverter is working than to put it in my laptop I'm afraid. From that point of view it's the same as my old one which means either both inverters are faulty or something else is wrong.
 
I don't think it's the screen cable although I'll check it anyway. I was there when the backlight stopped working and it happened when my laptop was shutting down but my charger started to charge just as it was about to turn off. The backlight went out and hasn't worked since.
 
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