Connecting monitor to desktop psu.

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kwill1429

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Sep 8, 2011
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I would love to have only one cable going from my computer to the wall so is it okay to make a cable from my psu to the power brick of my monitor. The psu is a
http://www.newegg.com/Product/Product.aspx?Item=N82E16817256084&clickid=WGR3nCQigzjb3SXRepzmiSjQUkTTOg0J2StERs0&iradid=97618&ircid=2106&irpid=79301&nm_mc=AFC-IR&cm_mmc=AFC-IR-_-na-_-na-_-na
The monitor is a
http://pcpartpicker.com/mr/newegg/dell-monitor-s2240m
Finally, seeing as the psu is modular, what female end should I use (aka molex)?
 
Solution
Onus
I can't help but think that this can be done, in fact I have an interest in this idea, not so much to run a monitor off a desktop PSU, but to run it off another +12V source (if its brick does indeed output +12V).
You would not go from the PSU to the brick, but from the PSU to the monitor. You might get another end like the brick has on it, then get a 1/8 mono audio plug for the other end of a short (e.g. 2') cable. Drill a hole in your case to mount a 1/8" jack, and put a molex on the other side of it (inside the case) to attach to the PSU; pay careful attention to polarity on these various connectors. I want to say I saw "2A" on one of my bricks, but I could be thinking of a +5V one for a router; I need to check; account for that...
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Onus

Onus

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Jan 27, 2006
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I can't help but think that this can be done, in fact I have an interest in this idea, not so much to run a monitor off a desktop PSU, but to run it off another +12V source (if its brick does indeed output +12V).
You would not go from the PSU to the brick, but from the PSU to the monitor. You might get another end like the brick has on it, then get a 1/8 mono audio plug for the other end of a short (e.g. 2') cable. Drill a hole in your case to mount a 1/8" jack, and put a molex on the other side of it (inside the case) to attach to the PSU; pay careful attention to polarity on these various connectors. I want to say I saw "2A" on one of my bricks, but I could be thinking of a +5V one for a router; I need to check; account for that when you figure the load on your PSU.
 
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kwill1429

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Sep 8, 2011
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@Onus pasting this so others can read what I sent. (I couldn't post so I pmed him.)

I will happily post a guide should I be successful. Before then I've got a few questions. First is polarity written as positive/negative volages? Aka the psu outputs -12v @.3a but the monitor accepts +12v @ .3a, would I need to reverse polarity to get compatibility? Also, I never knew I could use audio cable as a post cable. Would I need a higher gauge of wire or is standard fine? That would be quite amusing to plug my display into an "audio port" aka psu. Anyway thanks for the tips.

 
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Onus

Onus

Titan
Jan 27, 2006
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...and my answer:
You'll need to check the polarity of the plugs. On the brick there would be a little picture indicating whether the tip (or center post) is the '+' or the '-'. You would use +12V from the PSU; just wire it appropriately (the black wire, ground, is '-', and the YELLOW wire is '+').
I've used audio plugs and jacks to carry power plenty of times in electronics projects. Depending on how much power is needed, I'd use nothing thinner than 20guage wire; you could use a piece of an 18guage lamp cord.
 
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K

kwill1429

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Sep 8, 2011
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Ok thanks for the help. The polarity on the brick says (-)-(*-(+) approximately(circle with negative, half circle dot, circle positive). Finally, the psu has an output for +12v @ 37a. Should I be worried about the extra amperage or is that just the max rate of power draw from the psu (it's like a budget and the monitor would take 0.3a)?

edit: also is it normal to get locked out of your pm's occasionally? I found that when I couldn't post, I also couldn't read pm's.
 
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