I'm working on a video project which involves outputting the Raspberry Pi signal to CRT TV. Pulling my hair out a bit trying to get any signal through to the CRT. Only getting a black screen.
My hardware setup is as follows:
Raspberry Pi 4B
A/V Composite Cable - 3.5mm to 3x RCA - 2m (from thepihut.com)
RCA to Scart adapter (https://www.amazon.co.uk/dp/B0C94VFPP3)
UK PAL CRT Television (has s-video and scart inputs)
I've followed the necessary steps, editing the config.txt file to output via the composite out jack. Please see code:
When I boot my Pi:
- Just a black screen on the correct channel of my TV, slight jump when i plug it in but no signal.
- Have tried with s-video too, and played about with the in and out switch.
- Plugged in only HDMI when booting, doesn't boot to HDMI all which indicates the config is setup correctly.
Would the use of GPIO pins have any impact on the composite out? I currently have magnetic sensors attached for this project.
I initially bought an RGB-Pi scart (https://www.rgb-pi.com/) however I soon realized that it would need to use all the GPIO pins to output. Maybe there is a way to get this up and running alongside the GPIO pins needed for the video project?
Really stuck about where next to proceed.
My hardware setup is as follows:
Raspberry Pi 4B
A/V Composite Cable - 3.5mm to 3x RCA - 2m (from thepihut.com)
RCA to Scart adapter (https://www.amazon.co.uk/dp/B0C94VFPP3)
UK PAL CRT Television (has s-video and scart inputs)
I've followed the necessary steps, editing the config.txt file to output via the composite out jack. Please see code:
Code:
# Enable audio (loads snd_bcm2835)dtparam=audio=on# Automatically load overlays for detected cameras and displayscamera_auto_detect=1display_auto_detect=1# Enable DRM VC4 V3D driver — may conflict with composite#dtoverlay=vc4-kms-v3d# Use FKMS instead for compatibilitydtoverlay=vc4-fkms-v3dmax_framebuffers=2# Let kernel handle video instead of firmwaredisable_fw_kms_setup=1# Run in 64-bit modearm_64bit=1# For composite, may need overscan enableddisable_overscan=0overscan_left=16overscan_right=16overscan_top=16overscan_bottom=16# Boost CPUarm_boost=1[cm4]otg_mode=1[cm5]dtoverlay=vc4-fkms-v3d[all]enable_tvout=1sdtv_mode=2 # 2 = PALhdmi_ignore_hotplug=1disable_overscan=0When I boot my Pi:
- Just a black screen on the correct channel of my TV, slight jump when i plug it in but no signal.
- Have tried with s-video too, and played about with the in and out switch.
- Plugged in only HDMI when booting, doesn't boot to HDMI all which indicates the config is setup correctly.
Would the use of GPIO pins have any impact on the composite out? I currently have magnetic sensors attached for this project.
I initially bought an RGB-Pi scart (https://www.rgb-pi.com/) however I soon realized that it would need to use all the GPIO pins to output. Maybe there is a way to get this up and running alongside the GPIO pins needed for the video project?
Really stuck about where next to proceed.
Statistics: Posted by AnalogPilot — Sun Jul 20, 2025 12:22 pm
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