The adapter cable is used to power a digital audio converter Ligawo. The Audio converter converts TosLink move to digital RCA and should really only be operated when the TV is running, therefore no permanent infected PSU was desired.
The adapter cable is plugged with me for supplying power to the USB Philips 47PFL6057 and one connected to the power jack of Ligawo converter and run as desired without problems a few weeks ago that TV on -> converter to, from TV -> Converter from