iPad air backlight not working

I have backlight problem, I checked diodes, both are ok and have 3.87V. Also there is continuity to lcd connector (pins 35, 37, 39, 41) with the same voltage. I checked backlight filter, looks good and also have voltage (3.82V) from PPVCC_MAIN_LCD_SW_CONN, voltage is present too on LCD connector (pins 17, 19 , 21, 23).

I don't have any idea what to check else. Any suggestions?

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Does the iPad actually display an image on the LCD? You can shine a flashlight on it when it's on to see it. If it doesn't at all and still turns on you may want to try another LCD.

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Thanks on your participation. Yes, it works, I see apple logo when I start it, also I can see slide button on display to turn off. I tried another LCD, it is the same situation.

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