I want to output my video to my dvd screen in my car. My input for the aux of the dvd player are RCA. Previously I was using a 3.5mm jack to output to RCA and this worked with my old phone (t mobile vibrant). Is there anyway to output the HDMI on this phone to rca inputs? Any help is appreciated. I posted in this thread because I'm assuming the fix would be an accessory. Thanks.
I doubt you'll find a cable to do it. hdmi is digital and the composite signal needed by the vehicle is analog. You'll need something like this:
http://www.amazon.com/HDMI-Composite-S-Video-Converter-3RCA/dp/B0047PDBP0/ref=pd_sxp_grid_i_0_0
Thanks for the quick reply, that was what I was afraid of. Guess I'm stuck with audio out for now.
Possible fix
tacomaguy20 said:
I want to output my video to my dvd screen in my car. My input for the aux of the dvd player are RCA. Previously I was using a 3.5mm jack to output to RCA and this worked with my old phone (t mobile vibrant). Is there anyway to output the HDMI on this phone to rca inputs? Any help is appreciated. I posted in this thread because I'm assuming the fix would be an accessory. Thanks.
Click to expand...
Click to collapse
I finally came up with a solution that works for me. My goal was to output the video of my phone to my dvd screen in my car. The dvd player has RCA inputs. Well rather than buying an hdmi adapter and trying to find a dc power source compatible with my car, I found an alternative solution. My old phone is a t-mobile vibrant which outputs video through a 3.5mm adapter which splits into RCA inputs. It worked fine for playing video on the screen but was outdated and I had to upgrade. The GS3 only outputs hdmi and Bluetooth is not an option for video so I had a great idea. Why not use my GS3 to wifi tether to my old Vibrant and stream audio / video through the wireless connection. So I rooted the phone, downloaded wifi tether from the play store (free) and set up my vibrant to connect to my GS3 through tether. In order to share files, I downloaded bubbleupnp (free with limitations) from the play store and now I can play files from my GS3, which wirelessly plays on my vibrant, which outputs to my RCA inputs. Its kind of a roundabout way of doing what I wanted but it works well. I can keep my vibrant in my car hooked up to a car charger, while my GS3 can be docked and charging as well. The only thing I have to do is remember to turn on my wifi tether when I get in my car and my vibrant connects automatically. And the best part is that if I play video or music from my GS3 library, I'm not downloading anything so no data usage from the wifi tether. Pretty awesome. I imagine this will work with any two DLNA devices so long as one of them has video out through rca or and older adapter. Hope this helps someone out.
And do you have two cellphones batteries to drain... have you connected 2 car chargers or anything like that? Your car panel will be with too many cables, no?
tacomaguy20 said:
I want to output my video to my dvd screen in my car. My input for the aux of the dvd player are RCA. Previously I was using a 3.5mm jack to output to RCA and this worked with my old phone (t mobile vibrant). Is there anyway to output the HDMI on this phone to rca inputs? Any help is appreciated. I posted in this thread because I'm assuming the fix would be an accessory. Thanks.
Click to expand...
Click to collapse
SkzBR said:
And do you have two cellphones batteries to drain... have you connected 2 car chargers or anything like that? Your car panel will be with too many cables, no?
Click to expand...
Click to collapse
Well I do have two car chargers, One in front and one in the back. I do need to get a good mount that has power attached. I've seen the ones that plug into the lighter and they have the power built right in so that will eliminate one cable and give me a nice dock for my GS3. Not sure what I'll do with the vibrant but I won't need to access it very much so might mount it to the inside of my armrest or something. I don't think the cables will really be a problem though. I'm just happy I got it working again.
Related
I can not believe what's happening with my new cable MHL! I have a TV with DVI input, but I've never had any problem because with a simple HDMI-DVI adapter I could always play HD video on my TV and, from the headphone, I have the audio connected to a "AUX input" of a stereo. It always worked with my laptop and my hard drive media!!
The problem is that the galaxy s2 headset turns off the sound when you plug the MHL cable. I can not hear anything on my TV!
I do not know what to do, I think has no solution. I even connected the mobile audio to my notebook's bluetooth, but when I connect the mhl cable no sound is heard again!!
Does anyone have any solution? Is there any menu to force the sound through headphones?
thanks
I think I have a solution. I Expose it to help someone having the same problem:
1 .- Buy a HDMI male to 5 RCA RGB audio video av component cable
2.- Buy a DVI-I 24+5 Male to 3 RCA RGB Female Converter Adapter
Now you have the video and audio separately using an HDMI cable
3.- Connect the RGB cable to the DVI and audio cables to your stereo
*I can not put pictures of the cables because I am a new user and the system will not let me, sorry.
frander said:
3.- Connect the RGB cable to the DVI and audio cables to your stereo
Click to expand...
Click to collapse
Sorry, HDMI doesn't carry analog audio signals. So you are out of luck with this RCA solution.
You need to a) change your TV model, or b) use a cheap AV receiver in between the GS2 and the TV set.
Think it's impossible to work? What bad news!! I don't understand why someone sells a cable that doesn't work!
What a fool I was to believe the technical characteristics of amazon:
Gold plated HDMI to 5 RCA component video audio AV cable.
Provides high resolution up to 1080p.
High definition sound and clear image transfers.
* if you write 'HDMI Male to 5 RCA RGB Audio Video AV Component Cable' in google, is one of the first result (amazon)
Does not matter, I've only lost 6 euros (ebay).
Thanks
Anyway I don't understand why we talk about converting the image and sound in analog. There are manuals about how to open an HDMI cable and also has the red, green and blue wires inside. Just for separate cables lost the concept of "digital? Not understand...
My TV has DVI input, which is also digital. As I said before, I have an HDMI female to DVI male that works perfectly on my TV when connect my laptop and my multimedia hard drive. If I could break the adapter, it would have too a derivation of wires a pin to another, right? And it works in high definition
All I wanted to do with this cable was to extract the sound from an HDMI cable because the Galaxy S2 lost the sound of the headphone and I can not connect to the AUX input of my amp.
The HDMI digital audio signal is transmitted as a single aggregated digital stream that contains a variable number of digital channels (from 2 to 7.1 and even more).
Also in the pre-HDMI days the DVD's SD multichannel digital audio stream was transferred using a single coaxial cable (electrical) or a single optical cable, hence no separated cables for every channel.
Therefore digital channels have to be previously decoded and separated, and then converted by DACs to discrete analog signals.
No hope then to directly get from HDMI a couple of stereo analog signals to feed your stereo amplifier, you should have read all the negative user reviews of that cable on Amazon UK.
My suggestion: buy a cheap (or used) AV receiver with HDMI inputs/outputs and then connect its analog stereo monitor output to the TV auxiliary audio input (red/white RCAs or 3.5mm connector), or just use a couple of speakers connected to the AV receiver.
I was really hoping to use this phone with any normal DVI monitor and use headphones connected to the phones headphone jack. I guess this destroys that idea.
Why is it that everytime something like MHL comes along they implement it with absolutely no foresight as to how it might be used?
I think that MHL is just similar to HDMI in that respect.
So you wouldn't get analog audio output from the GS2 even if it had an HDMI instead of an MHL.
Today the manufacturers of latest cell phones expect connections only with TV sets equipped with complete digital ports (generally HDMI), not considering their products to be used with computer monitors.
BTW, DVI video-only port today is considered not suitable for full-HD audio-video material, and probably couldn't even fully support 1080p/24fps video signals.
DVI monitors support 60hz 1080p okay. Whether or not they cans support 1080p/30 or 1080p/24 purely depends on the monitor's firmware. Most monitors woudn't support 24hz but some probably support 30hz, which I think the GSII uses.
Also I didn't know HDMI out on phones did the same thing. Thanks for telling me that.
I guess it's the matter of audio routing!
Maybe someday someone could mod the kernel to handle these types of situations ;-)
Fingers crossed!
I found this app "SoundAbout" witch let you change the output
it works perfectly for me, sound on the smartphone and video on the monitor (tested on galaxy s3)
Coincoin0017 said:
I found this app "SoundAbout" witch let you change the output
it works perfectly for me, sound on the smartphone and video on the monitor (tested on galaxy s3)
Click to expand...
Click to collapse
Thank you Coincoin0017. But the problem resolved itself when I installed android 4.0.4. Now the headphone output works when I plug the MHL adapter
Serav said:
I was really hoping to use this phone with any normal DVI monitor and use headphones connected to the phones headphone jack. I guess this destroys that idea.
Why is it that everytime something like MHL comes along they implement it with absolutely no foresight as to how it might be used?
Click to expand...
Click to collapse
now days they only cater for the mainstream market.
the assumption was probably everyone will only use it on a hdtv that has its own speakers.
I agree its a sad state of affairs but thats how it is I guess, I am currently trying to get sound as I am using a hdmi monitor which has no speakers.
---------- Post added at 11:29 PM ---------- Previous post was at 11:19 PM ----------
Coincoin0017 said:
I found this app "SoundAbout" witch let you change the output
it works perfectly for me, sound on the smartphone and video on the monitor (tested on galaxy s3)
Click to expand...
Click to collapse
sweet this works, thanks man.
doing the same, sound to phone, picture to hdmi monitor.
google seems brainless at times they really do, why this isnt in the OS I dont know.
Intersting
frander said:
Thank you Coincoin0017. But the problem resolved itself when I installed android 4.0.4. Now the headphone output works when I plug the MHL adapter
Click to expand...
Click to collapse
Excellent. ... (hopefully still works on 4.3) I have the same problem with my PWD8 which is a panel so doesn't have speakers.
Is it possible to take a cable from the phones (Note 2) 3.5mm jack and put it into an AV receiver so that it uses the speakers attached to it?
Or even bluetooth sound to a separate speaker from the phone?
Sound about app useful for allowing sound to get to av receiver via rca cable
Basically I'd like to connect my phone up to my receiver, to stream music while I workout. Would this be possible? Could I use the headphone jack, and would that be very good quality?
I was looking into a microusb to hdmi converter, but not sure that'd work yet.
Iczer said:
Basically I'd like to connect my phone up to my receiver, to stream music while I workout. Would this be possible? Could I use the headphone jack, and would that be very good quality?
I was looking into a microusb to hdmi converter, but not sure that'd work yet.
Click to expand...
Click to collapse
Go to Radio Shack (or whatever) and get a cable that is a 3.5mm stereo plug on one end, and stereo RCA (red and white plugs) on the other.
A lot cheaper, and HDMI is going to be WAY overkill unless you are trying to play high-quality sound files stored right on the phone... Anything you're going to be streaming from Pandora or any online source will be about FM radio quality.
The cable I mentioned above is even over-qualified for most internet streaming sources.
Dalmus said:
Go to Radio Shack (or whatever) and get a cable that is a 3.5mm stereo plug on one end, and stereo RCA (red and white plugs) on the other.
A lot cheaper, and HDMI is going to be WAY overkill unless you are trying to play high-quality sound files stored right on the phone... Anything you're going to be streaming from Pandora or any online source will be about FM radio quality.
The cable I mentioned above is even over-qualified for most internet streaming sources.
Click to expand...
Click to collapse
I saw an micro usb to HDMI for $10 off monoprice, that was the only reason I was looking at that route.
Iczer said:
I saw an micro usb to HDMI for $10 off monoprice, that was the only reason I was looking at that route.
Click to expand...
Click to collapse
That would make sense. I haven't seen them that low (of course, I haven't really looked for one either, so I guess it doesn't mean much for me to say that. )
The one disadvantage of using the USB would be that I don't think your phone would charge while plugged into the receiver.
If I remember the HDMI specs correctly, some cables are capable of delivering a charge, but very few (if any) components have the proper ports to provide a charge...yet.
Use an auxiliary to auxiliary . I use one in my truck (no bt) and my radio at work. $10 at Target.
Google Android Fan Network @chefdave12118.
I like the BlueBridge Bluetooth to stereo adapter:
http://www.buy.com/pr/product.aspx?sku=213820936
I use it at home, in my truck. Love it!
Monoprice has a USB to hdmi with charger port for 10 bucks. Search mhl
OK I just got my adapter it is the official Samsung OEM MHL adapter. I had just one problem but I now have three. (PS I Have the White T-Mobile Galaxy S II which is the exact smart phone as the AT&T Galaxy S II Skyrocket)
Problem #1: I am not sure if its possible or how to go about doing this. OK I use a nice 27" HP 2711x LED Monitor on my bedroom with my Xbox 360 connected via VGA, my gaming rig connected via HDMI, and now I have my MHL adapter connected via HDMI. The problem is that my Monitor is only a monitor and it has no internal speakers, but I have a pair of external speakers that I use for sound the speakers have 3 input options. I can connect directly into the subwoofer portion via the red and white RCA cables(this is how my Xbox is connected), I can connect with my basic 3.5mm auxiliary cable plugged into the speakers input jack(this is the way that I connect my phone to play music), or I can connect via the inline Auxiliary cable that the speakers have built in(which is the way my computer is connected). Im not an idiot when it comes to Tech I know that HDMI cables handle both sound and video but since my monitor only takes the video part I can't get any audio when streaming from my phone to it, so I plugged my speakers inline auxiliary cable to my phone so that the sound would reroute to it, but that didn't work either it produced no sound =/, so I also tried to just plug in my headphones into my phone and again no sound. So are there any work arounds or ways to make it so my phone will let me output sound via its 3.5mm headphone jack or even its loud speaker? Or is there a seperate cable/jack I can purchase to split the HDMI cables video and sound, and make the sound output via either 3.5mm audio jack or red and white RCA cables, and let the video output via HDMI?
Problem #2: OK my MHL adapter was working video wise but today I plugged it all up and it wouldn't work at all my monitor kept saying no input detected so I was sad and I decided to remove my phones battery to do a soft reset. And it fixed the problem so I started web browsing etc and all of a sudden it stopped working again. Is there a work around for this or reason or fix?
Problem #3: Is there anyway to make the output quality full HD? Because when I am outputting and on the browser its like the resolution is so off which results in everything being huge and somewhat pixelated.
Sorry for the length I like for my post to be as in depth as possible.
Sent from my SGH-T989 using XDA
OK I just got my adapter it is the official Samsung OEM MHL adapter. I had just one problem but I now have three. (PS I Have the White T-Mobile Galaxy S II which is the exact smart phone as the AT&T Galaxy S II Skyrocket)
Problem #1: I am not sure if its possible or how to go about doing this. OK I use a nice 27" HP 2711x LED Monitor on my bedroom with my Xbox 360 connected via VGA, my gaming rig connected via HDMI, and now I have my MHL adapter connected via HDMI. The problem is that my Monitor is only a monitor and it has no internal speakers, but I have a pair of external speakers that I use for sound the speakers have 3 input options. I can connect directly into the subwoofer portion via the red and white RCA cables(this is how my Xbox is connected), I can connect with my basic 3.5mm auxiliary cable plugged into the speakers input jack(this is the way that I connect my phone to play music), or I can connect via the inline Auxiliary cable that the speakers have built in(which is the way my computer is connected). Im not an idiot when it comes to Tech I know that HDMI cables handle both sound and video but since my monitor only takes the video part I can't get any audio when streaming from my phone to it, so I plugged my speakers inline auxiliary cable to my phone so that the sound would reroute to it, but that didn't work either it produced no sound =/, so I also tried to just plug in my headphones into my phone and again no sound. So are there any work arounds or ways to make it so my phone will let me output sound via its 3.5mm headphone jack or even its loud speaker? Or is there a seperate cable/jack I can purchase to split the HDMI cables video and sound, and make the sound output via either 3.5mm audio jack or red and white RCA cables, and let the video output via HDMI?
Problem #2: OK my MHL adapter was working video wise but today I plugged it all up and it wouldn't work at all my monitor kept saying no input detected so I was sad and I decided to remove my phones battery to do a soft reset. And it fixed the problem so I started web browsing etc and all of a sudden it stopped working again. Is there a work around for this or reason or fix?
Problem #3: Is there anyway to make the output quality full HD? Because when I am outputting and on the browser its like the resolution is so off which results in everything being huge and somewhat pixelated.
Sorry for the length I like for my post to be as in depth as possible.
Sent from my SGH-T989 using XDA
I need to find a way to output video to AV input so i can connect my note 2, to my stereo in my car any clue how i can do this?
Just use a Left Right channel to 3.5mm wire...
EDIT: Oh... For video I think we only support HDMI but there might be a dongle you could buy..
Sent from my SPH-L900 using xda premium
You'll need to output hdmi via mhl, then use a hdmi > AV adapter to connect to the radio.
☆SoA: Son's of Android™☆
I like to break stuff!
What Evil said ^^^^
Sent from my SPH-L900
Thanks for the help all the hdmi > AV adapters i cant find have to be powered anyone know of any that dont need power or i can power from a usb maybe? thanks.
vwgti18 said:
Thanks for the help all the hdmi > AV adapters i cant find have to be powered anyone know of any that dont need power or i can power from a usb maybe? thanks.
Click to expand...
Click to collapse
Best thing to do is buy an AC> DC power inverter for your vehicle. I use one to charge my note 2. They turn the 12v cigg lighter into a 120v wall outlet.
☆SoA: Son's of Android™☆
I like to break stuff!
This is one thing that sucks on newer devices. I remember on my HTC Touch Pro and TP2 you could just plug into your deck using the rca inputs. It was nice to be able to play stuff off your phone directly to the monitor.
Plus because I kept the cables in my car, it was easy to take in a house and plug in and play videos and pictures. I did this all the time for my Grams, to show her my little ones. She was never into newer HD tv's lol. Oh well, I'm sure HDMI connections will be really available on decks before you know it.
Sent from my Mackafied Sprint Galaxy Note II using XDA Premium.
KB112 said:
This is one thing that sucks on newer devices. I remember on my HTC Touch Pro and TP2 you could just plug into your deck using the rca inputs. It was nice to be able to play stuff off your phone directly to the monitor.
Plus because I kept the cables in my car, it was easy to take in a house and plug in and play videos and pictures. I did this all the time for my Grams, to show her my little ones. She was never into newer HD tv's lol. Oh well, I'm sure HDMI connections will be really available on decks before you know it.
Sent from my Mackafied Sprint Galaxy Note II using XDA Premium.
Click to expand...
Click to collapse
A lot of the new decks already have hdmi pigtails in the back or hdmi ports in the front.
☆SoA: Son's of Android™☆
I like to break stuff!
-EViL-KoNCEPTz- said:
A lot of the new decks already have hdmi pigtails in the back or hdmi ports in the front.
☆SoA: Son's of Android™☆
I like to break stuff!
Click to expand...
Click to collapse
Yeah I have seen some, but I mean it's not quite mainstream yet. At least not enough for me to switch out decks! Lol
Sent from my Mackafied Sprint Galaxy Note II using XDA Premium.
vwgti18 said:
I need to find a way to output video to AV input so i can connect my note 2, to my stereo in my car any clue how i can do this?
Click to expand...
Click to collapse
You can find plenty of HDMI to RCA adapters on the internet. The problem is that HDMI is a digital signal, and RCA is analog. And from your picture, your device is looking for an analog signal. Hence, you need to get something to convert the HDMI signal into an Analog one. They exist, but are not cheap. The cheap ones, not used, are $200. Require a power source. And we haven't even touched is the phone's video output going to be accepted by the stereo's video input. If the video output doesn't match--resolution and refresh rate--you're not going to have a picture. On PCs, you can these settings in the video control center or use special applications. For Android, I don't think they exists because the TVs with HDMI are new enough that a designed to accept the video phones are putting out; the phone are also designed to output video HDTV will accept.
Never mind you'll still need some kind of car charger to power the HML adapter. In my experience, using your phone and HML, will drain your battery, although slower because it doesn't need all the 2.0mha the charger puts out, but doesn't give the phone enough power to maintain it's current charge status.
The other issue, it's hard to find converters for HDMI to composite RCA. Not many people are in demand for them since a lot of the old TVs that only had those inputs are gone. They exists though.
That all said, my question would be exactly what applicaitons or tasks are you trying to don on your GN2 though your car deck? If it's just play music or audio into it, If so, then just get a 3.5mm to RCA cable. They can be purchased for a couple dollars. Here's a link for Monoprice.com: http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10218. Just make sure you get a male to male version. There are options as well, depending your car deck. If it has a casette deck, you can get 3.5mm caasette adapter. If you want more robust, you can get a 3.5mm FM car cigarette transmitter such as Coby CA 745; the problem is you need to have a clear FM station, which can change depending on your geographical location. I like that model because you can change FM to be used, and has cigarette charge port. The benefit, you're not dependent on the car having any kind of audio output ports, or cassette player.
If you're wanting to play video, ie use the mirroring function of the phone, I'm thinking you be much better served with a newer car deck that can support HDMI video in. Heck, depending on the screensize of you deck, it may be better just to get a car dock for the GN2 and just send the audio through your car stereo. Another alternative, use the Wifi hotspot function of the GN2 and use a tablet. I'm not saying I've ever used the GN2 to use Google Navigation and my 10" tablet to have NHL Center Ice going while driving to a meeting an hour away, but you can see how it can be done:
I've seen some pretty creative mounting methods use with the Nexus 7.
Hopefully this was helpful
lovekeiiy said:
You can find plenty of HDMI to RCA adapters on the internet. The problem is that HDMI is a digital signal, and RCA is analog. And from your picture, your device is looking for an analog signal. Hence, you need to get something to convert the HDMI signal into an Analog one. They exist, but are not cheap. The cheap ones, not used, are $200. Require a power source. And we haven't even touched is the phone's video output going to be accepted by the stereo's video input. If the video output doesn't match--resolution and refresh rate--you're not going to have a picture. On PCs, you can these settings in the video control center or use special applications. For Android, I don't think they exists because the TVs with HDMI are new enough that a designed to accept the video phones are putting out; the phone are also designed to output video HDTV will accept.
Never mind you'll still need some kind of car charger to power the HML adapter. In my experience, using your phone and HML, will drain your battery, although slower because it doesn't need all the 2.0mha the charger puts out, but doesn't give the phone enough power to maintain it's current charge status.
The other issue, it's hard to find converters for HDMI to composite RCA. Not many people are in demand for them since a lot of the old TVs that only had those inputs are gone. They exists though.
That all said, my question would be exactly what applicaitons or tasks are you trying to don on your GN2 though your car deck? If it's just play music or audio into it, If so, then just get a 3.5mm to RCA cable. They can be purchased for a couple dollars. Here's a link for Monoprice.com: http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10218. Just make sure you get a male to male version. There are options as well, depending your car deck. If it has a casette deck, you can get 3.5mm caasette adapter. If you want more robust, you can get a 3.5mm FM car cigarette transmitter such as Coby CA 745; the problem is you need to have a clear FM station, which can change depending on your geographical location. I like that model because you can change FM to be used, and has cigarette charge port. The benefit, you're not dependent on the car having any kind of audio output ports, or cassette player.
If you're wanting to play video, ie use the mirroring function of the phone, I'm thinking you be much better served with a newer car deck that can support HDMI video in. Heck, depending on the screensize of you deck, it may be better just to get a car dock for the GN2 and just send the audio through your car stereo. Another alternative, use the Wifi hotspot function of the GN2 and use a tablet. I'm not saying I've ever used the GN2 to use Google Navigation and my 10" tablet to have NHL Center Ice going while driving to a meeting an hour away, but you can see how it can be done:
I've seen some pretty creative mounting methods use with the Nexus 7.
Hopefully this was helpful
Click to expand...
Click to collapse
Yea thanks for your input. I was just about to order this http://www.amazon.com/gp/offer-list...l?ie=UTF8&colid=&coliid=&me=&qid=&seller=&sr=
and this
http://www.amazon.com/gp/product/B00A9H30LU/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1
and see if i can get it to work but after u said all that idk if i really want to risk spending the $50 what do u think?
As for buying a new deck thats out of the question i just got the new late 2012 model JVC.
I already do music. I wanted video so i can play movies and play youtube but mostly wanted my google maps to show on the big screen so i could just tuck my phone away.
The HML cable is a decent price. You may it to be useful for showing off pictures or videos at home or at friends' on the TV rather than the phone. I see the cable still being useful if what your propose doesn't work out.
I can't so for certain if it's going work. It looks promising. I like the Eleckcity has 60 positive reviews (4 or 5 stars) out of 78. Fifty dollars isn't a bad cost. I would just check the return the policy. I would write Eleckcity and ask about returns if they product doesn't work or as expected. Also, there is a review who used it in a similar manner that you're trying to do. I would definity write that person to find out more details on the headunit and so forth.
The only thing I would be weary about is powering the Eleckcity. Since it doesn't have it's own powersouce, it's going to draw it's power from the USB. I don't know for certain, but I don't believe the USB power on the GN2 sends out power. If it does, I don't think it's much. It's only used the OTG USB cable with items that had their power. And the MHL has as power supply. If it doesn't power it, I think a simple USB powerhub could do the trick. I'm sure there is probably some kind of cigarette car adapter usb hub that could found or the like.
I understand the goal. I don't know how much effect and cost is worth it for you to how often you would use the maps and video features on your deck's screen. In looking at some of the JVC multimedia head units, screen size isn't very larger since they range 6.1" to 7". So I put eh screen size as negligible factor, by my standards. Obviously, use the headunit's screen would be more elegant look, espically compared to having three windowshield/dashboard car docks, a 150W USB cigarette car power inverter, and cables hanging in from of the dash; one is the for the satellite radio. Then again, I only need that stuff about once every six months. So, maybe a simple dock such as iOttie or Clingo may work well with a car charger for phone if you only plan to use it say, once a month or less. T
The last paragraph is just proposed plan B and C, and so forth.