The article provides four different ways to connect the L&R audio channel ground wires: 1. Don't connect at all 2. Connect the shield further up the harness (not sure what this means) 3. Attach to the audio negatives on the EMV (no idea how to do this. Which wire is this on the EMV?) 4. Make and use a balanced line transformer (Whatever one of those is. Perhaps similar to Marvin the Martian's Electrotrimodulator?)
Attaching to audio negatives at the TV plug is not mentioned (nor which wire it would be). Can anyone with expertise in this area suggest the best alternative? Am I using the right cable and plugs for the job?
Wednesday, February 14, 2007 - 08:19 am, by: Damian Ware(Frozenpod)
First thing, if you are planning to mount the DVD player in the glove box why patch the AV leads into the TV plug why not use shorted leads and patch into the back of the EMV.
As for grounding, I have found in one case that noise was getting into the system was the DVD was powered by the AC/cig socket and the RCA ground was at the TV. I ran the DVD off a isolated battery and the noise was no longer present.
Tricky with this one was the noise was only present when the engine was running. I bought the ground back to a common point for both the DVD power supply and RCA. This fixed the problem.
In your case I would tap into the wires at the EMV and connect to the ground wire there. With much shorter wire run you shouldn't have a problem so try it and see. This may be what was referred to as connect the shield further up the harness ie closer to the EMV.
Mark Ribbans TryHard SA UZZ-031 V8, 1972 Mazda RX2 Coupe, TE Gemmy
Wednesday, February 14, 2007 - 04:15 pm, by: Mark Ribbans(V8gtsoarer)
Damian I would say that the reason to patch in to the TV under the back seat (rather that the rear of the EMV screen) is simply to avoid having to remove the EMV screen?
Perhaps it is easy for a sparky such as yourself, but I found the prospect of pulling the screen and all those wiring looms out rather daunting!
Wayne, for earthing i just put all the audio earths together on a common ground wire in the TV loom, but i do get some noise so you'd probably be advised to do what Damian said.
If you a just patching the to TV module it's a pretty straight forward job, just splice in the various wires and leave the TV wiring loom unplugged if you want. Just run the A/V cables down the centre under the carpet (an old coat hanger and some tape will help). I 'mounted' mine in the centre console rather than the glove box however, as it's much easier to get at from the drivers seat.
Mark Ribbans TryHard SA UZZ-031 V8, 1972 Mazda RX2 Coupe, TE Gemmy
Wednesday, February 14, 2007 - 04:21 pm, by: Mark Ribbans(V8gtsoarer)
Wayne, i just looked at the pics of the wires you intend to use. You *might* have some trouble running them under the carpet due to how thick they are..
The standard wires that are used in the Soarer are very thin so i'm not sure you'll get the benefit out of using them, but then i'm no expert!
Wednesday, February 14, 2007 - 08:01 pm, by: Wayne Llewellyn(Ozaristov300)
Thanks guys. I've pulled out the EMV before (dead capacitors) so I'm not too daunted by doing it again. Keeping the run short also reduces chance of noise entry. The shielded cable should also help.
I assume the wiring map for the tuner plug is the same for the EMV end: 12V+ = Grey 12V- = White with Black trace Video + = Light Blue Video - = Brown with White trace Audio L + = Green Audio R - = Red Audio - = same as Video -?
Friday, February 16, 2007 - 12:28 pm, by: Tim Pike(Keydecoder)
The TV Tuner wiring goes directly into the Radio Receiver which is under the backseat on the other side of the car. Then from the radio reciever it goes into the amp.
I have mine wired into the TV Tuner and have never had a problem with noise. I use the grounds for the audio/video wires, which are the pins on the opposite side of the plug. Do a search for this and you'll find a few other places where this info is posted.
Saturday, February 17, 2007 - 08:53 pm, by: Richard Baird(Richo)
There is another more important reason to hook up your dvd etc at the tv tuner plug...
The car does have a certain amount of filtering built in for the power supply to these modules and using the tv tuner plug will help in reducing noises from cheaper units.
Mark Ribbans TryHard SA UZZ-031 V8, 1972 Mazda RX2 Coupe, TE Gemmy
Thursday, February 22, 2007 - 11:40 pm, by: Mark Ribbans(V8gtsoarer)
Hey Richard, just re-read what you said about the power and the tv tuner plug. My A/V device gets its power from a 'random' 12v power source i found in the vicinity where i installed it and i get a fair amount of audio noise (rev radio i call it) from it.
If i was to power the A/V device from the filtered power that the TV Tuner gets instead, do you think it would have any effect?
Friday, March 16, 2007 - 12:24 pm, by: Wayne Llewellyn(Ozaristov300)
Success. For $20 I can now play almost any audio and/or video device through the EMV. Amazing.
I ended up running the 3 co-ax cables and single power wire from under the rear seat, under the carpet under the driver's seat (easy, once seat removed!) into the console area in front of the gear lever. I removed the ashtray and made up a plate with 3 RCA connectors for Left, Right and Video. The power cable from the TV plug now powers the cigarette lighter socket. Just pop-up the old ashtray cover and voila, AV Central.
Now I can plug in my new HDD player, an iPod, mobile phone, digital camera or any AV device for which an RCA lead is available. My son plugged in his Sony mobile phone and the sound quality was amazing. The phone has a built in graphic equaliser which works a treat and gets around the loss of the DSP controls while in TV mode.
To recap why I undertook this mod, the CD stacker died needing a new laser and overhaul at ~$350. For $220 I bought a HDD player with a 120GB hard drive to play audio and video files at high quality. The EMV connection cost $20 and I have now have vastly more AV functionality available for less than the cost of the stacker repair.
If you have an EMV and haven't done this mod, go forth and duplicate.
Saturday, October 27, 2007 - 06:27 pm, by: Jarrod Moore(R32big_boy)
Hey, sorry to bring up an oldish topic, however i was using the guide found here http://myweb.westnet.com.au/rbaird/dvdinstall.htm The dvd player worked fine when i initially wired it up. However when i tried to get the screen to operate when the car is moving i ran into some problems. I did exactly what the guide said to, i CUT the hand brake (pin 5, black wire) on the small plug and spliced this into the ground (pin 26, white/black) on the 26 pin plug. Did the same thing for the NSS wire, and finialy cut and wired in a toggle switch for the SPD wire. When i turn it one click with the key, acc? it works fine, however when it is at IGN it cuts out. I can still hear it however i cannot see the picture. Any one out there able to steer me in the right direction?
Saturday, October 27, 2007 - 07:14 pm, by: Luke Gomer(Luke)
Jarrod, the tutorial is correct. People often mis understand the concept of 'plug side' and 'emv side' or 'loom side'. You don't for example want to connect the handbrake to ground - it is the EMV that needs it's handbrake wire sent to ground.
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