High Quality SCART HDMI Converter Converter

I have a new AV receiver with a loud HDMI connections. In addition, I have a Philips LCD TV (HD ready) with HDMI and SCART inputs and a DVB-T receiver from Technisat, which only has a Scart output. So I created the High Quality SCART HDMI Converter Converter between plugged. The sound is transmitted without difficulty. The picture, however, I have problems.
The image appears slightly darker compared to the transmitted image via Scart. In addition, there are recurring at different distances brief moments where suddenly Farbeinstreuungen of blue, green and red light appears in the image and the picture a little jerky.
At first I thought that these were one-time effects and that these effects would adjust it eventually, but in moving pictures, the effect appears more frequently and is easily available.
I use the High Quality SCART HDMI Converter Converter now just for sound and fetch me the picture of the old direct attached between DVBT receiver and TV SCART cable.
So for me is good for the High Quality SCART HDMI Converter Converter not really.