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After the flash I remove the usb cable, wait about 20 seconds, then replug the usb cable: the display make a white blink, then off (also the LEDs) for about 15 seconds, then... white screen!!!
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If you're getting a white screen, it probably means the backlight connectivity is correct. But we should verify that first.
Please install s1giveio and connect the player. Then issue following commands in s1giveio console (excluding the comments):
Code:
o ef 0 ; disable KEY mode on GPIO B
o f0 20 ; enable GPIO B5 for output
o f1 0 ; disable GPIO B5 for input
Then the following two commands will turn on and off the backlight if my guess about it being on B5 is correct:
Code:
o f2 20 ; this line should turn on the backlight
o f2 0 ; backlight should now be off after this one
About CEx and general display connectivity issues:
http://wiki.s1mp3.org/Display