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Help New replaced screen not working

Somehow my Nexus7 screen got broken, so i bought new LCD with Digitizer.
Now when i received the screen and replaced it, it appear LCD does not work.
The digitizer is working just fine, as when i power up the tablet wait a while and start touching it i can hear the sound of keyboard (have to type pin to unlock).
My old broken LCD screen did still work somehow, just showed some strange colors arround totally unusable, so i tried to check if the new LCD isn't failing and connected back the old LCD, and here comes suprise ! the old one doesn't work anymore too...
The tablet is running without problems, it's only the LCD which totally doesn't work.
Is it possible that the graphic card is broken, or could it be the cable connecting LCD to main unit ?
Has anyone any idea what may be wrong ?
 
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