Defective Touchscreen? - MTCB Android Head Units Q&A

Initially the screen would not display anything, it would just stay blank, but the buttons would light up indicating the power was OK. I disconnected and reconnected the car battery which fixed the display however the touchscreen no longer works and nor do the touch sensitive buttons. I reflashed the ROM and MCU through booting into recovery and it still doesn't work.
Is it a hardware defect or is the something else I can try?
It's a JY RK3066 unit (Joyous J-3812-Y / Pumpkin JY-C0223 to be more precise).
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http://www.autopumpkin.com/catalog/product/gallery/id/256/

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[SOLUTION]Repairing Faulty Touchscreen / Digitizer

After countless of hours diagnosis and doing trial and error in order to rectify the faulty touchscreen issue where a certain part of the touchscreen area is not working. My solution for this problem is by putting a piece of paper or hard cardboard underneath the digitizer ribbon cable just after the connector.(refer the circle part in the picture below)
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Hope it fix yours.

Ze551 touch connector?

Hello, can anyone point me on a image where does ze551ml has the cable connector on the motherboard responsoble for the touch screen digitizer? Ive got lots of screen ghost touches lately qfter screen change, tryinf to figure the problem, lose connector might be one
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It is probably the one marked by a red circle.
The other screen cable (the blue circle on the left) is only responsible for the display itself and not the touch panel.

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