This is a simple hack to activate telemetry on the Turnigy 9x RC transmitter. Someone came with this idea on a forum and I have applied it in a different configuration: http://www.rcgroups.com/forums/showthread.php?t=1510047
Everything is explained in the video (make sure you have annotations on):
You will also need to to this cut on the other side of the board (I missed it from the video):
Dorin's tech blog 