What if there is a Dark Screen

Connect the tablet with a monitor through an HDMI Cable and see whether there are any images displayed through the HDMI Cable. 

If you see the images through the HDMI cable, it means that there are no issue with the main PCBA board, but maybe the panel. 

If there are NO images displayed through the HDMI Cable, it means that there is a possibility of a faulty PCBA board.  

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