@ian57 yes, you are right of course. It did boot though, that's what got me confused
Next time I will read my hardware manuals properly, lol

Hi,

for the record: I got it working.

I did setup recalbox on the RPi Zero, then I modified the config.txt and recalbox.cfg and now my TFT is working.

What i probably did wrong: I have a RPi3 and a RPI Zero. At first, my recalbox setup was simply taken from the RPi3 and put into the RPI Zero. Maybe that was the problem, I dont know for sure. I thought that the RPi3 and RPi zero are essentially the same hardware, so it wouldnt matter.

Best regards,
Michael

@tikiandskull Hi,

thanks for your config.txt. I tried it - but still no success
Behavior is still the same. Problem seems to be something else.

I plan on reinstalling recalbox, maybe I misconfigured something else.

Wiring should be OK if it works with raspian, am I right?

Best regards,
Michael

I quote some code :-)

Hi,

I'm trying to run recalbox on my 3.5'' tft screen (the NTSC/PAL from Adafruit). The screen itself is working correctly (with raspian I get output). However, I dont get any output when using recalbox, the screen stays black.

I used this guide I found in the wiki: https://github.com/recalbox/recalbox-os/wiki/Connect-your-recalbox-to-a-CRT-with-composite-(EN)

According to this guide I removed all hdmi_ entries from /boot/config.txt and added:
sdtv_mode=2
hdmi_ignore_hotplug=1

Further I changed the recalbox.conf to global.videomode=default

After this changes there is only HDMI output during the boot phase, but unfortunately no output on composite

Has anyone advice or suggestions how to proceed?

My current config.txt settings are:

disable_overscan=0
sdtv_mode=2
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512
temp_limit=65
kernel=zImage
disable_overscan=0
overscan_scale=1
arm_freq=1000
core_freq=250
sdram_freq=450
force_turbo=0
over_voltage=6
over_voltage_sdram=0
gpu_freq=250
sdtv_mode=2
hdmi_ignore_hotplug=1

--

Best regards,
Michael