D'accord merci pour l'information, ca me rassure dans mon initiative ;)
the only thing to do with the HD 3,5 inch tft screen is to add this config in config.txt file
#3.5 HD tft screen 800x480
hdmi_timings=480 0 16 16 24 800 0 4 2 2 0 0 0 60 0 32000000 6
and all is done. I'm going to write documentation about these screen
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