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# 12V to LCD

Posted on 2005-04-15
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Hi experts,

I got a 7" LCD monitor

it has a red wire and a black wire, and takes 12V.

I would like to power it using a cable coming from my computer's PSU.  Preferably a floppy cable.  I was wondering if anyone knows which color is which.  Is yellow 12V?  is red 12V?  are the blacks always GND?

Thanks
Dan
0
Question by:dbrownell83

LVL 6

Accepted Solution

Hi Dan,

Yellow = 12V
Black = Ground
Red = 5V

Besides that, I'm not sure if the power coming out of that is compatible or not.  Somebody else here may give their 2 cents about it.

Good Luck!  :)
0

LVL 13

Assisted Solution

Yes, the power from a drive power cable should be fine if you have the capacity to spare.  Black is ground, yellow is +12 volts.  If 12 volts is what you need, connect the yellow wire to the red wire of the display, black to black.  From what you have said it should work fine as long as the power supply has adequate capacity (the display is likely to draw about 1 to 2 amps, a bit more than a typical drive).
0

LVL 13

Assisted Solution

Dan, on average a 17" LCD Monitor will use 3 to 4 amps, but the more important infomation is that it will consume about 60 Watts, whereas a Hard Drive consums 25 to 30 Watts.  Watts is how your Power Supply is rated.

As I have stated in similar questions, to know how much Wattage you need in a power suppy, here is a rough guide, and allow at least 30 watts over:

AMD Athlon 64 - 90 to 110w
AMD Thunderbird - 50 to 60w
AMD Athlon XP - 50 to 80w
AMD Duron - 40 to 60w
Intel P4 - 60 to 100w
Intel PIII - 25 to 40w
Intel Celeron - 30 to 60w
----------------------------
Components
----------------------------
Motherboard - 18 to 28w
Opical Drive -each - 30w
Hard Drive-each - 25w
Memory Stick (Each) - 7 to 12w
Non Powered USB/Firewire (Each) - 5 to 10w
AGP - 10 to 15
PCI Video Card - 15w
PCI Card (Each) - 5w
Internal Powered Sound Cards (SB Audigy 2 ZS) 12v @ 25w
Fan (Each) - 3w
Keyboard & Mouse - 6w

Personally, I wouldn't hook up an LCD Monitor that way, but as I haven't ever tried it...I wouldn't know.  Most all LCD monitors have 12VDC that will protect it against a power surge, even though your PS in your system is regulated, there is nothing to stop a power surge if it goes bad.
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LVL 1

Author Comment

thanks all

lennon, it's 7", not 17", so i think it'll be ok.  but thanks for the wattage info
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LVL 13

Expert Comment

That's why I estimated 1 to 2 amps, which is 12 to 24 watts.  And even that might be high for a seven-inch monitor.
0

LVL 3

Expert Comment

If that LCD was expensive you may want to consider a breaker type system if there is a power surge that LCD will get the full blast from the PSU and it could fry without one.
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LVL 1

Author Comment

will a fuse on the positive end work?
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