Interesting failure mode of color LCD touchscreen

[cvanc]

Hi all-

I have a control panel that has a color LCD touchscreen.  It more or less works but the displayed image has very low contrast.  The backlight is OK and the displayed whites are nice and bright as expected.  But the displayed black level is way, way too high, leading to a very washed out, "milky", nearly unreadable image.  The image is otherwise intact.

I have not seen one fail like this before and wondered if any of you had a thought?  Not sure if this is even fixable.  I hope so as it's an old product and finding a new display is probably gonna be tough.  Thanks.

[Rasz]

bias voltage, dc leak, check tcon for the display, measure voltages, inspect components visually