Rostfrei
Member level 2

Hello
I bouth the PC video card with composite TV out. Of course now I want to watch films on TV, so I connected video-output and sound-card output to TV trough SCART cable connection.
It all works well, video is great, but all the time there is disturbing hum noise at the back of the audio signal. My brother for example connected his computer to TV the same way I did and it works perfect for him.
At my friends house I tried to connect his PC with Hi-Fi stereo amplifier and he too have the same problem with hum noise, but at his place that noise is so disturbing you can't listen to anything.
I heard that could be the problem with ground potential mismatch, but I don't think that's the case in my problem. My cable (about 5m) is well shielded. At first I didn't connect audio ground and video ground to the shield of the cable, which is connected to the ground of TV and PC of course, so I thought there is some kind of ground problem. Then I connected all three grounds together and there were NO differences. I still get this anoying hum noise in the audio signal.
What should I do ??? Is it possible that could be sound-card giving me the grey hair ?
Thank you for all your help in advance.
Regards,
I bouth the PC video card with composite TV out. Of course now I want to watch films on TV, so I connected video-output and sound-card output to TV trough SCART cable connection.
It all works well, video is great, but all the time there is disturbing hum noise at the back of the audio signal. My brother for example connected his computer to TV the same way I did and it works perfect for him.
At my friends house I tried to connect his PC with Hi-Fi stereo amplifier and he too have the same problem with hum noise, but at his place that noise is so disturbing you can't listen to anything.
I heard that could be the problem with ground potential mismatch, but I don't think that's the case in my problem. My cable (about 5m) is well shielded. At first I didn't connect audio ground and video ground to the shield of the cable, which is connected to the ground of TV and PC of course, so I thought there is some kind of ground problem. Then I connected all three grounds together and there were NO differences. I still get this anoying hum noise in the audio signal.
What should I do ??? Is it possible that could be sound-card giving me the grey hair ?
Thank you for all your help in advance.
Regards,