jd68 wrote: 
> Just another idea to check ():
> There are two generations of these displays: With the newer one you can
> control the brightness of the backlight while the first generation has
> only an on/off capability. In both types, the backlight is controlled by
> the content of the file
> '/sys/class/backlight/rpi_backlight/brightness'.
> For the first generation, a value greater than '0' will switch on the
> the backlight while '0' means 'backlight off'.
> The second generations accepts values between 0 and 255. The higher the
> value the higher the brightness. Now comes the important part for you,
> kbpro: values lower than 10 (or 11) lead to a black (or dark) display
> what is similar to the behaviour of your display.
> 
> Hence, I suggest to check the value in the file
> '/sys/class/backlight/rpi_backlight/brightness' whether it is in the
> range of 1 ... 10. If yes, then choose an higher one (50 is more than
> sufficient.

Thank you for the suggestion jd68.  I just checked and it is set to
255.

One note from the distributor (thanks buyapi.ca) - they don't think that
the numbers on the back of the panel correspond to a manufacturing date,
so that may be a red herring.

kbprop


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