@biotox Essaye comme ca, c'est ma config pour ma sortie composite, et ta essayé en inversant les connecteurs rouge et jaune, moi le câble j'ai pris celui-ci a moins de 2€ avec un adaptateur péritel, j'en ai même pris 3 pour le prix et au cas ou.
uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
disable_overscan=1
uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1
comment to get jack audio
#hdmi_drive=2
config_hdmi_boost=0
force hdmi while the tv can take time before sending the signal on the hdmi output
#hdmi_force_hotplug=1
uncomment for composite PAL
sdtv_mode=2
sdtv_aspect=1
uncomment for lirc-rpi
#dtoverlay=lirc-rpi
if you plug your tv at the same time as your rpi and that the rpi switches from the hdmi or give a low resolution because tv had no enough time to initialize it
boot_delay=3
uncomment if you don't want the rainbow at startup
disable_splash=1
Overclock
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512
avoid_safe_mode=1
kernel=zImage
NOOBS Auto-generated Settings:
#hdmi_force_hotplug=1
hdmi_ignore_hotplug=1