I am trying to connect my Pi to an old tv, which only has composite input.
I have tried sdtv_mode in every mode (0 to 3) but it just gave me a flicking display.
When I was pluging in the HDMI cable, and then unplugging the composite video cable, to change the mode again, the signal became clear with no flickering.
After some experimenting, I found that if the composite cable was in the socket, but not clicked in, and the HDMI cable was plugged in to the TV and the Pi, the composite video would work... (I was on the AV channel on the TV)
Is there a way for me to fix this, so that I don't need the HDMI cable plugged in, as my old TV doesn't have a HDMI port, and I want to use that.
Thanks in advance, Tom