screen alternator whine caused by pc fan!?
I have been trying to get rid of the alternator noise on my xenarc 700tsv forever, it's really starting to **** me off. It is in the form of horizontal lines across the screen that change frequency with engine rpm, and a faint whine through the screen itself. (there is no interference with the engine off). The odd thing is what causes the interference: I recently added a molex powered fan to my computer because it runs too hot and the fan is what seems to cause the noise on the screen. Without the fan plugged in the alternator noise goes away. I am trying to get rid of the screen noise without removing the fan. This doesn't make any sense to me how a fan causes interference to the screen. What is going on? I imagine there is a ground loop somewhere?
Here is the basic setup:
The screen is powered by a 12v cigarette lighter source and connected to the pc via vga and usb.The pc is powered by an inverter that is hooked directly to the battery. Originally I had alternator whine through the speakers but I solved that by grounding the pc case to the car chassis. I have tried grounding the ground of the screen power at the battery, and at different points on the chassis, and it still doesn't solve the problem. Also the rca audio cables have nothing to do with it, if they are unplugged, there is still noise. getting rid of the molex powered fan is the only thing that gets rid of the alternator interfence on the screen.
Any ideas on how to get rid of the interference without removing the fan, because it gets really hot in my trunk.