I got a RPi scientific kit from CrazyPi.com. The kit came thru nicely, and upon following the instructions from various forums, I was able to do the following:
Connect the RPi to a VGA display using the HDMI-VGA converter and boot into NOOBS.
Install Raspbian, then got the internet to work, camera worked, installed packages etc.
USB hub worked with keyboard and mouse.
When I tried to get the video on the 4.3" TFT (also part of the kit), using the RCA composite cable, no success.
I have done a few things as mentioned in posts etc.
When in NOOBS, and both HDMI and RCA cable connected, try changing the display from HDMI, to safe-HDMI to RCA to NTSCby pressing 1,2,3,4 respectively, however, the keypresses 1, and 2 changed modes, 3 and 4 were un-responsive.
Upon booting, tried changing the file ~/boot/config.txt and commented the line "hdmi_force_hotplug=1", which forces HDMI out, then restart without HDMI. In this case the behavior is rather surprising. The RPi doesnt boot at all without the HDMI cable, which is evident from the consistent green-light and ethernet and USB hub not lighting up.
The TFT has three outputs, one yellow, one white and one red. Yellow and white match to the RCA composite cable and red is used for powering the TFT, with an adapter. It works fine as it shows the crazypi background image on powering.
Another reply from crazypi support asked me to "activate RCA out in the configuration of Raspbian OS".
What am i missing here ?
EDIT: Upon further tinkering, I found that dis-connecting the RCA cable and HDMI, the Pi boots, as expected. So the problem seems to be in RCA cable/TFT, how can I debug this further ?