video noise
Printed From: the12volt.com
Forum Name: Mobile Video, GPS, and Navigation
Forum Discription: Mobile Video Head Units, DVD Players, LCD and TFT Monitors, Navigation, GPS, PS2, PS3, XBox, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=33910
Printed Date: May 28, 2024 at 7:46 AM
Topic: video noise
Posted By: all tune
Subject: video noise
Date Posted: June 15, 2004 at 8:43 AM
If anyone can help I installed a 8" flip down monitor and a indash dvd player in a 2002 Dodge grancaravan sport. This is the problem I have lines(noise) going through the monitor when the van is on and the cooling fan is running, if the cooling fans turn off the line go away and monitor looks great. I have changed it's power source & grounds several of times in the van and have the same results, But if I use a outside power source the monitor is fine I also changed the video cable and ran it a different direction. If anyone can shine of light on this problem I'm open to all suggestion.
Replies:
Posted By: toyota_gs400
Date Posted: June 16, 2004 at 12:00 PM
It sounds like your have feedback from your cooling fan. You can do a quick fix by installing a ground loop isolator on the video line. You can probably get one at radio shack or an electronics store. It's pretty much just a 1 to 1 transformer. Hope that helps.
Posted By: all tune
Date Posted: June 17, 2004 at 8:40 AM
is there 2 types of isolators? because when i installed it, the screen would go blank and fuzzy.
Posted By: toyota_gs400
Date Posted: June 17, 2004 at 8:45 AM
I don't think you installed it correctly. What wires did you put where?
Posted By: all tune
Date Posted: June 17, 2004 at 2:26 PM
The Iec gli ground isolator I installed has 2 female inputs and 2 male outputs 1 red ,1 white and 2 ground leads. I installed it between the dvd and monitor video rca, by the way I don't have any noise in my audio. I have also ran just has a test power and ground to my honda battery vehicle running fan on, and in the van the monitor looks good clear no lines. when I move the power and ground back to the vans battery and fan running I get the lines back on the monitor and thats not having any audio, fm mod. plugged in. I will try any thing @ this time
Posted By: toyota_gs400
Date Posted: June 18, 2004 at 7:46 AM
You've got some kind of complicated ground isolator. When you hooked up the isolator, did you also hook up the two ground leads? Find out, if you can the wireing for the isolator. It should be like this: 
Hope that helps.
Posted By: toyota_gs400
Date Posted: June 18, 2004 at 7:53 AM
Posted By: all tune
Date Posted: June 18, 2004 at 9:50 AM
yes i did hook up the ground leads. I'm going to try to get a different isolator, any certain type you suggest. Thank for trying to help me troubleshoot.
Posted By: sparkie
Date Posted: June 22, 2004 at 7:00 PM
The problem may be with the fan's gound. Try hooking the fan to the battery's terminals with temporary wires (fuse the positive side for safety) You could have a bad power or ground to the fan or the fan may be bad. You can also try using a power line filter on the screen's power line.
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sparky
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