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powering the lcd - is there a "best" method?

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  • powering the lcd - is there a "best" method?

    I notice lots of folks seem to use their power supplies for this.

    Is there any problem just using the existing wiring intended for the factory radio to power the monitor?

    Just curious why folks would use the power supplies when 12V wires are right there in the dash already.

    TIA
    Heath
    First Carputer in progress.....

  • #2
    I use my power supply because I ran into issues with the monitor flickering using the cigarette lighter adapter. Your results may be different but it never hurts to use regulated power. I can garuntee the power coming from your computer psu will be cleaner than the power coming from the adapter.
    "stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
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    • #3
      Originally posted by WillyWonka View Post
      I notice lots of folks seem to use their power supplies for this.

      Is there any problem just using the existing wiring intended for the factory radio to power the monitor?

      Just curious why folks would use the power supplies when 12V wires are right there in the dash already.

      TIA
      Because the 12v in the dash isnt regulated. Car 12v generally runs around 14v and jumps all over the place, electronics don't really like that.

      Personally, I run +12v and +5v from my pc's PSU to power the LCD, and USB hub respectively.
      -James
      Car: 2004 GTI VR6 24v Turbo 2.8L, GT35R, 630cc, Unitronic, Bosch 044, etc, etc..
      Main PC:i7 [email protected], 6GB DDR3, MSI X-58 Pro-E, Win 7 x64 RTM, Scythe Mugen2, 128GB G.Skill Falcon, 2x ATI4850 512MB Crossfire, Auzentech X-Fi Forte, Grado Labs SR-80

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      • #4
        Originally posted by WillyWonka View Post
        I notice lots of folks seem to use their power supplies for this.

        Is there any problem just using the existing wiring intended for the factory radio to power the monitor?

        Just curious why folks would use the power supplies when 12V wires are right there in the dash already.

        TIA
        "I got a computer. How should I power it?"
        See how vague my question is? That's what you just did, without any reference to your hardware, your car nor anything at all, nobody here can tell you how to power the mystery hardware you're talking about.
        Ampie Case
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        • #5
          I dont think his question was too abstract...
          -James
          Car: 2004 GTI VR6 24v Turbo 2.8L, GT35R, 630cc, Unitronic, Bosch 044, etc, etc..
          Main PC:i7 [email protected], 6GB DDR3, MSI X-58 Pro-E, Win 7 x64 RTM, Scythe Mugen2, 128GB G.Skill Falcon, 2x ATI4850 512MB Crossfire, Auzentech X-Fi Forte, Grado Labs SR-80

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          • #6
            If it's a lilliput, then you probably should run it on regulated power. most xenarcs have internal voltage regulation I believe. Confirm with the manual to make sure.

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            • #7
              the monitor will come with a 12v regulator, but it wont be a good as what your power supply does. in my car, the supplied regulator works fine, but if you find your screen doesnt look as steady as it should then try running it right off your power supply.

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              • #8
                If it's intended for vehicle use, its raw power should be okay except for voltage dips (that are regulated upwards by separate supplies).

                The raw car supply is quite unfriendly though and devices require better regulation and spike protection than if powered from a domestic rectifier or charger with optional battery etc.
                Hence as above, most will run through their supply.

                And if your battery does get reverse connected or struck by lighting or your system's voltage goes way out, better to lose your DC-DC converter only than the LCD as well.

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                • #9
                  Originally posted by OldSpark View Post
                  And if your battery does get reverse connected or struck by lighting or your system's voltage goes way out, better to lose your DC-DC converter only than the LCD as well.
                  electronics downstream of the converter can still be affected; depending on the quality of the components and the magnitude/type of short.

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                  • #10
                    I've got a xenarc 702tsv, and I used to power it from my carnetix 2140 psu...now I've switched to the cig adapter....

                    I used to get a squiggly kinda sound out of my tweeters when the 2140 was powering it...it would go away when i turned it (xenarc) off..so I decided to try the cig directly into xenarc...no more squiggly sound...oh...and picture is just the same...

                    ymmv
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                    • #11
                      great info everyone.
                      thanks very much.
                      the logic makes sense to me, looks like I will power the monitor off the power supply.
                      Heath
                      First Carputer in progress.....

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                      • #12
                        The logic make sense, it's true. However if you will be using an M4-ATX PSU you still need an LC filter.

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                        • #13
                          Originally posted by 96300NAZ View Post
                          electronics downstream of the converter can still be affected; depending on the quality of the components and the magnitude/type of short.
                          Very rare!
                          I can't imagine a SMPS DC-DC converter passing reverse polarity - even a linear DC-DC for that matter!
                          The exception would be if fuses were replaced by 2" nails, and ALL series semiconductors failed in short circuit mode (not open), etc....

                          But granted, there are some amazingly crap systems out there that are capable of the impossible (from a normal "good" design POV lol!)

                          And a direct lighting strike kills just about anything. (lol - but an ouch-lol!)

                          However, I would like to learn of specific instances.... (and who made/designed/installed them!)

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                          • #14
                            Originally posted by 96300NAZ View Post
                            electronics downstream of the converter can still be affected; depending on the quality of the components and the magnitude/type of short.
                            Doubtful, especially with a short
                            -James
                            Car: 2004 GTI VR6 24v Turbo 2.8L, GT35R, 630cc, Unitronic, Bosch 044, etc, etc..
                            Main PC:i7 [email protected], 6GB DDR3, MSI X-58 Pro-E, Win 7 x64 RTM, Scythe Mugen2, 128GB G.Skill Falcon, 2x ATI4850 512MB Crossfire, Auzentech X-Fi Forte, Grado Labs SR-80

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                            • #15
                              Is it true that the Xenarcs will only hold brightness and contrast settings if powered from the cig lighter (i.e. consuming a small amount of power, not being completely shut off when the computer does)?

                              Or is the changing resolutions at boot up that erases the 800x600 bright and contrast settings?
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