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Thread: Question about Powering an LCD from the 12v rail of a PC

  1. #1
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    Question about Powering an LCD from the 12v rail of a PC

    I have a 17inch touch screen monitor, that was removed from an IBM cash register. I have it mounted in my car. My question is: The monitor states it can handle 12-16v with 24Watts max, is it possible/safe to power it via the 12v rail of the PC? I know very little about electrical stuff, so if someone could give me a hint I would greatly appreciate it, as these monitors are about $1500, and I don't really want to fry it just to know if it works or not.

    Thanks

  2. #2
    FLAC SNOtwistR's Avatar
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    That would be too much draw on the 12v rail and power mainboard too. I would pickup the dc-dc-usb unit http://store.mp3car.com/DCDC_USB_Int..._p/pwr-047.htm and just use that to power your monitor. If it wasn't for the voltage drop of starter motor you could power right from car wiring. SNO

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    Ok, i have an M4-ATX power supply that outputs 250 watts, would that not be enough to power both?

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    FLAC SNOtwistR's Avatar
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    Sorry I should have asked what you had. Sure that should handle it. Really its only 2amps but might do a little peak above that when you first turn it on. SNO

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    Ok, thanks. I was concerned because of its 24Watts max that the computer PSU would deliver too much, if that is even possible.

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    FLAC SNOtwistR's Avatar
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    I think the M4 has about 10-12amps on 12v rail. Maybe put a 3amp fuse on line to monitor close to M4 just to be safe. Only my 2 cents SNO

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    Ok thanks, will give that a try

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    Neither darque nor pervert DarquePervert's Avatar
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    If it can handle 12-16v, why not power it straight off the car's electrical system?
    The only issue you'd have is the monitor dropping out during vehicle crank...

    In my eyes that would make for simpler wiring.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  9. #9
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    Quote Originally Posted by DarquePervert View Post
    If it can handle 12-16v, why not power it straight off the car's electrical system?
    The only issue you'd have is the monitor dropping out during vehicle crank...

    In my eyes that would make for simpler wiring.
    You would still want to make sure you use some sort of filter since the spike at startup can be significant.

  10. #10
    FLAC SNOtwistR's Avatar
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    On thinking about it, this might also be a cheap solution for you http://www.jameco.com/webapp/wcs/sto...0001_175805_-1 and just use that for your monitor. That monitor might be too finicky for straight automotive power, for 25 bucks I wouldn't risk it. SNO

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