Fading blue light after lcd

Hey I had a friend bring me a Wii u controller with a cracked LCD. I carefully replaced it and now when you press the power button the blue light comes on then fades away. No display or anything. Ideas?

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Have you looked at the battery does it have any power, did you recharge the Wii U gamepad after changing the LCD?

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I am trying to get a working battery to test. I believe it had the glowing blue light before I swapped the LCD out. I have tried charging it. The orange light comes on.

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Same thing is happening to me.

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