@voljega Ok thx you lead me to the solution i modify config.txt with the following

hdmi_drive=2
hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=16

and it works!

I think I know what the issue is... aparently Retroarch detects the TV as 4/3 even if I set the "sdtv_aspect" to 16/9.
Like showed in this picture:

If I try to use a custom resolution I get this Issue, It appears I loose screen size and got some big black margins, like in this picture:

I've been messing with configurations and I think I'm gonna leave it with a 8/7 aspect ratio and activate the bilinear filter, which make pixels softer and seems that corrects some of the pixel deformation I was suffering...
It's not perfect, but I think I'm getting an aceptable result.
And aparently it seems that the native resolution of the screen is 720x576. If I modify it I get those Issues.

Bon, je m'auto-répond.
Je converti tout simplement mes splash screen 16/9 en 4/3 sur adobe première et je les réinstalles sur la RECALBOX.

@pigme oui essayes des valeurs plus grandes ou plus petites, voire négatives, je ne me rappelle plus

https://gitlab.com/recalbox/recalbox/blob/master/package/recalbox-system/rpi3/recalbox.conf#L43
vidéo de boot tu sera baisé par contre

@arutha Les fins de ligne (non visible sauf afficher l'hexa) ne sont pas encodés de la même manière sous Windows/Linux/OSX et ça peux poser problème.

@huey-le you could eventually give a try to :

hdmi_cvt=1280 720 60 3 0 0 0 hdmi_mode=2 hdmi_group=87

reference : https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=24679&sid=4c0e33c3e707fccba5494107fe8260a2#p227301

@paradadf

Thank you so much!

hello,

j'ai utilisé ma copie IMAGE et recopié sur une autre carte. Voila je retrouve ma config INI tout est OK.
CLOSED

@supernature2k Thank you so much! I will try this tonight! I really appreciate your help!