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Thread: I need a different way to power my LCD

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    I need a different way to power my LCD

    First I had the LCD hooked up to a molex connector on my power supply (M2-ATX), that worked good with only a little bit of flickering (I left the inline filter on the LCDs power wire). The problem with that is that my LCD needs a constant 12v for the auto-on to work. When the power supply shuts the voltage off to my LCD, it starts back up in off mode, meaning that I have to press the power button everytime I start the car (which is annoying).

    I tried running it on my factory stereo wiring, (unregulated) and I get alot of flickering when the bass hits, even with the inline filter there.

    My question is, is there any regulated 12v output on the M2-ATX that doesn't switch on/off with the ignition? I need something good, that won't be affected by the voltage drop when the bass hits (big amp). If not, is there some sort of standalone 12v voltage regulator/stabilizer that I can use to power the LCD so it stays on all the time? And should I clip the inline filter off of the LCDs power wire when using a regulated 12v power source?

    Edit: I can make one myself if somebody has some good schematics and a parts list

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    Maximum Bitrate JimmyFitz's Avatar
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    First you should tell us what model your LCD is.
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  3. #3
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    Quote Originally Posted by blazini View Post
    First I had the LCD hooked up to a molex connector on my power supply (M2-ATX), that worked good with only a little bit of flickering (I left the inline filter on the LCDs power wire). The problem with that is that my LCD needs a constant 12v for the auto-on to work. When the power supply shuts the voltage off to my LCD, it starts back up in off mode, meaning that I have to press the power button everytime I start the car (which is annoying).

    I tried running it on my factory stereo wiring, (unregulated) and I get alot of flickering when the bass hits, even with the inline filter there.

    My question is, is there any regulated 12v output on the M2-ATX that doesn't switch on/off with the ignition? I need something good, that won't be affected by the voltage drop when the bass hits (big amp). If not, is there some sort of standalone 12v voltage regulator/stabilizer that I can use to power the LCD so it stays on all the time? And should I clip the inline filter off of the LCDs power wire when using a regulated 12v power source?
    O.K.,

    If you are using regulated power, then you do not need the "egg" or inline filter.

    Now, tell me, what do you mean that the auto on doesn't work unless it has constant power. If it has constant power, how does the LCD know to auto start with the ignition.

    If you get flicker and, I assume, dimming of the lights, you might try the band aid of a capacitor, or perhaps, look into strengthening your electrical system,, such as battery, alternator, and wiring.

    Michael
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    It's an Ex-Audio something or other. The LCD knows to turn itself on or off by recieving a video input. When it's hooked up to a constant power source, the PC sends video to the monitor, it comes on. When the PC shuts off, the monitor gets no video signal and turns itself off. The auto-on on this monitor works by video signal, not power on power off. So I just need a way to get clean regulated unswitched power to it. The flickering g gets worse as the bass hits with the unregulated power. When running it off the PSU, there was a slight flicker, but it had nothing to do with the stereo, it was probably just cuz I left the filter on.

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    Quote Originally Posted by blazini View Post
    It's an Ex-Audio something or other. The LCD knows to turn itself on or off by recieving a video input. When it's hooked up to a constant power source, the PC sends video to the monitor, it comes on. When the PC shuts off, the monitor gets no video signal and turns itself off. The auto-on on this monitor works by video signal, not power on power off. So I just need a way to get clean regulated unswitched power to it.
    Sorry, but it doesn;t sound right. The monitor just needs power before the video signal hits it. Since your PS has power before it starts the MB, and before there is a video signal coming from the MB/VID Card, you should have no problems with the "Auto On" if it indeed, has such a feature< and I don't believe it does.

    HOWEVER, if what you mean is, you want constant power to the monitor, so you can turn the switch on, and then just let it wait for the Vid signal to display, really, the monitor will be drawing power the entire time. This will lead to a flat battery in short order (they use about an amp of power) It is not a true AUTO ON, in that the unit is ON the entire time, just nothing is being displayed because there is nothing to display.

    I could be wrong about that, but I am most confident. You can check this by using an ampmeter, to determine the difference in power draw between the "off and on states" with constant power, and with and without a vid signal.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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    When the LCD first powers up, the power button is red. When you turn it on the power button goes blue, if there is no video source it says "no signal" and shuts itself right off. When it goes off the power light is purple, meaning it's in stand by, waiting for a video signal. Once it gets the video it comes on and the power light goes blue.

    The thing is, whenever you cut the power to it (by turning the car off with a switched power source), when it gets power again, it starts in off mode (red light), not standby mode (purple light). Now if I can keep a constant power source running it it will stay in standby mode for good, so when I turn the car/PC on the video source will turn the monitor on. It's not AUTO ON like a Lilli, but when it goes into standby, it shuts itself off completely other than the standby light. It's not like the screen is just blank but the backlighs are still on. It's OFF, so there really is no current draw.

    All I need to know is where to get a constant, regulated 12v from. I don't believe there is one on the M2-ATX, so I just need another solution.

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    Low Bitrate jnorion's Avatar
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    There will still be some power draw. Maybe not the full amp that Wired was saying but still not really something you want to mess with, unless you have a way to cut it off after a certain amount of time.

    I don't think there is a constant REGULATED source in the car. The only actual constant source is the car battery. You'd have to regulate it yourself.
    ~ Joel

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    Quote Originally Posted by jnorion View Post
    There will still be some power draw. Maybe not the full amp that Wired was saying but still not really something you want to mess with, unless you have a way to cut it off after a certain amount of time.

    I don't think there is a constant REGULATED source in the car. The only actual constant source is the car battery. You'd have to regulate it yourself.
    I'm really not worried about the current draw of the monitor while it's on standby, I don't know what the Lillies do, but I know this one isn't drawing any signifigant amount of power. Just for fun I'll do a test when I get a chance, but as I've said, I have it wired to stay in standby right now, and I haven't had the slightest problem with my battery being drained.

    But all of that is off topic, all I need to know is if anyone has a suggestion for regulated/stable constant power. Maybe a link to some schematics for a voltage regulator that can hande going below 12v for a second (bass hit).

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    Maximum Bitrate NiSlo's Avatar
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    http://www.robotcombat.com/marketpla...ct_other2.html

    Second item down. $9 US for a 12v regulator. Might be an option as long as your monitor doesn't drawn more than 1 amp continously. Splice it into your constant and off you go

  10. #10
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    I have the ExAudio I have it "always on", and then it turn purple when no vga signal. The power draw is minimal. I have gone on a 2week vacation with it "purple" and all was fine.

    The M2 wont have a 12v always on. You need to use the constant 12 volt from your car. If it is too shaky, then you will need to get a good supply, or as wired said, bandaid it with a cap.

    I have gotten the on screen menu to pop up once like the lilliputs and you can change to auto on with vga. But I wasn't fast enough with the remote and the menu went amount. I wasn't able to get the menu back.

    I say just get a stable 12v line and slap the screen on there.
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