video interference, moving horizontal lines
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=94334
Printed Date: May 15, 2024 at 4:55 AM
Topic: video interference, moving horizontal lines
Posted By: reinnie
Subject: video interference, moving horizontal lines
Date Posted: May 29, 2007 at 9:31 AM
Hi Everyone,
I installed Alpine M780 with dual LCDs on my headrest.
I've tried multiple suggestions from other in a different forum and he suggested I asked someone here, who may have experience with the Alpine M780 unit.
I'm getting some kind of interference, moving horizontal lines. The interference becomes worse when I start the car.
Can someone give me some guidance or ideas?
This is what I've done so far.
1. The DVD player is not using a splitter and is connected directly with RCA wires to the alpine box. The alpine box has two outputs to the LCDs using Alpine own thin wires. Each end of the connectors are ~.25in in diam. and has 5 pins on each side.
2. The DVD player and LCDs are directly connected to the battery. Grounding is at the battery terminal too.
3. I'm using one of the best RCA cable, Monster THX cables.
I've played the DVD player inside the house and no problems. Used the lcds inside the house also no problems.
Regards
Replies:
Posted By: swerve
Date Posted: May 29, 2007 at 2:02 PM
whenever we get that problem we just throw a power filter to the dvd player and the screens and that usually solves the problem. just make sure you get one that has a high enough rating for all the current draw in the system.
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git yer swerve on!
Posted By: reinnie
Date Posted: May 29, 2007 at 4:30 PM
Thanks for the reply. Where can I get this power filter? and How do I determine which on is high enough?
Is there a different name for this? I'm assuming the power filter connects to the power line of the dvd and screens.
Thanks for your input.
Posted By: reinnie
Date Posted: May 30, 2007 at 7:53 AM
Therefore, can I just get 1 power filter to use for both dvd and screens? the dvd player needs a 3 amp & screens also 3 amp. Can I just use one 10 amp power filter for both?
Thanks.
Posted By: reinnie
Date Posted: May 30, 2007 at 7:58 AM
is power filter the same as noise supressor? I saw a Alpine 4080 Noise suppressor/filter for 12 Volt power lines carrying current up to 30A.
Below is the link:
https://caraudiosecurity.com/shop/product/products_id/304.html
Posted By: reinnie
Date Posted: June 02, 2007 at 9:57 PM
Finally bought a 12amp power filter.
Installed on DVD player only, still has int. Installed on screens, still has int. Ended up installing 1 filter on both wires. There are less int. but sill noticable.
The lines are still there but moving a lot faster, therefore less noticable.
Do you think it would make a difference if I bought two filters and installed them on the dvd and screens individually?
Posted By: swerve
Date Posted: June 03, 2007 at 3:12 AM
what kinda of vehicle do you have? how is the interference when the car is off/on? have you tried taking everything out of the car, hookin power up to the car and testing it to see if any interference is still visible?
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git yer swerve on!
Posted By: jonogould
Date Posted: June 03, 2007 at 6:22 AM
i think i read somewhere that the problem lies with the grounding being at the battery terminal..
Apparently that causes all kind of "noise" and the grounding should be placed independantly..
maybe give that a try? i am by no means an expert but hey, if it manages to solve the problem 
Posted By: reinnie
Date Posted: June 03, 2007 at 6:33 PM
I have a Volvo XC90.
With car off - a thinner multiple line interference.
With car on - a thicker multiple line interference.
I have tried powering inside the house but not through car power supply and no interference.
Is it possible the interference is from the car's seat airbag? Since the screens' wires go inside the car seat.
jonogould, I have grounded at three different locations before grounding directly to battery as last resort.
Posted By: swerve
Date Posted: June 03, 2007 at 8:47 PM
i would try taking everything out of the car, connect it to the battery but keep the equipment out of the car. then test it with the car on and car off. see if it still has interference, then take the screens and move them around the car and see if the amount of interference changes in different spots. if you dont have lines when the stuff is out of the car then its definitely getting radiated noise from something in the car. next i would try different places to run your wiring and see if that helps. ------------- git yer swerve on!
Posted By: jonogould
Date Posted: June 04, 2007 at 2:56 PM
wierd stuff man, im about to install my own screen in tomorrow so i'l tell you how it goes.. hopefully i dont blow up or anything because it will be my first install - as i sed i am a complete beginner at this :)
i'l tell you how it goes and hopefully i wont get any horizontal lines.. hmmm...
Posted By: jonogould
Date Posted: June 05, 2007 at 12:19 PM
well i have successfully installed my screen in my glovebox... it is only temp cos i am getting a in-dash screen in a couple of months. i wired my ground to the existing stereo ground and i added my power to the acc wire that goes to the stereo (un-used in my new setup).. this way it doesnt run down my battery after a few days with it on standby.. and the best thing of all, there are no lines wotsoever.. the picture isnt so great cos it is night time here, but it pretty much shows the setup firing on all cylindars :P 
Posted By: reinnie
Date Posted: June 05, 2007 at 12:36 PM
I think it must be something with my car interfering.
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