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The next suggestion was a damaged screen.
However, detaching the board from the main screen and inspecting the substrate reveals no sign of damage. In addition, the device had not bee dropped and has no visible faults on the image. It failed while in use, so I think the screen may not be the problem.
New screens are available, but too costly to try for the moment without knowing for sure that a new unit is required.
However the now opened and non-watertight device has two sets of serial headers on the main board, so I obtained an FTDI USB to serial module and used that to try and see what is going on during the initial boot process...
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