supachris26 Xbox-HQ Enthusiast Xbox Version: V1.3 Modded: X-BIT
Joined: Jun 09, 2004 Posts: 23 Location: New York USA
Posted: Thu Dec 30, 2004 7:27 pm Post subject: Power Supply
What's the eaisest way to test a power supply?.. i have a voltage meeter. I wanna make sure that the motherboard is getting power from the power supply
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will41605 Xbox-HQ Experienced
Joined: Nov 27, 2004 Posts: 120 Location: sheboygan wisconsin
Posted: Sun Jan 02, 2005 10:30 am Post subject:
Post Posted: Mon Dec 13, 2004 5:42 pm
Post subject: how do u test the power supplies (dieing without my xbox) Reply with quote Edit/Delete this post
how do u test the power supplies particularly the 1.6 thanks
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custom-xmodz
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Joined: Aug 28, 2004
Posts: 445
Location: Wales, UK
Post Posted: Tue Dec 14, 2004 7:02 am
Post subject: Reply with quote
Hiya
If you dont have the motherboard I would plug it in and test all the plugs (HD and MOBO) for volatge with a multimeter. I would also test the fuse for continuity.
But if you don't know what you are doing as it's high voltage, and in the uk at least it is enough to kill you.
Joined: Nov 08, 2004
Posts: 58
Location: Georgia, USA
Post Posted: Tue Dec 14, 2004 3:55 pm
Post subject: Reply with quote
Ill post later with more details when I get next to my Xbox later, but I wanted to post this quickly so that you dont make a crucial mistake.
DO NOT turn on a PC (or xbox) powersupply without a load attactched to it. This can destroy a powersupply (if it isnt already broken). This is because this is a switching powersupply. It is meant to give the same voltage no matter the electrical charicteristics of the circuit. The only prerequisite is that there be a circuit there (a load).
I learned this from one of my teachers when I was using an old powersupply to build a digital circuit prototyping lab for home. I showed him my idea and he ran that concept by me. I trust his word because his MA was in power distribution systems.
Ill write later with detailed instructions.
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Joined: Aug 28, 2004
Posts: 445
Location: Wales, UK
Post Posted: Thu Dec 16, 2004 5:07 pm
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I know what your saying, ive never had any problem however, although I would normally just use a known working motherboard. However a few times I have switched it on with nothing plugged in, and never had any probs, in concept it's dodgy, but then so is picking up a chip without being grounded, and yet ive never damaged a chip either.
Joined: Nov 08, 2004
Posts: 58
Location: Georgia, USA
Post Posted: Fri Dec 17, 2004 6:55 am
Post subject: Reply with quote
Think of it as russian roulette. Ive handled many ICs in and out of school without a grounding strap and only had one damaged so far. It just happened to be a 512MB memory chip when I did. From now on when handling expencive ICs I use a strap, unless its something like a 74LS04 IC, thoes are cheap.
Ive been told by two professors (electrical engenners), one who build switching powersupplies, and the other who used large arrays of them. Both say I should always have a load attached to them to pevent a possibly damaged PS from being a damaged one. It makes the powersupply deviate from tolerances overtime by slightly changing the values of components. over time it WILL break your PS. It will "work", but it wont deliver correct voltages.
Ok heres how I check if its ok:
start with Xbox off
1) take apart your xbox as normal, remove the HDD, remove or keep plugged in and move aside, it dosent matter.
2) Place the black (negative) probe of the Voltmeter in the Molex plug (the plug should stay conected to the MB). Place the Black probe inside the top of the plug where a Black wire runs into (ive provided a picture)
3) turn on the Volt meter to the "20V DC" scale. DC is the V with a line and dashed line.
4) make sure that the red probe isnt touching metal.
5) turn on Xbox
6) with Xbox on start at the right and work to the left (skipping black wires) with the red probe.
Voltages should be near, and are seldomly at the nominal voltages. Expect a +- 10-15% tolerance.
DSC00155.JPG
Description:
This is a (or rather 2) load resistors. 5W each. You need these in parallel with the 12V and 5V outputs if you want to run one by itself. This pic is part of a larger lab I did at school, so no need for two at the same time. Resistance of above 1k is
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DSC00155.JPG
DSC00203.JPG
Description:
Place th probe down into the Molex plug. There is no need to move the black probe or to check the other black wires.
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DSC00203.JPG
_________________
-Scourge
a.k.a. President Skroob
The electronic ninja.
-software n00b-
Not like Hack Benjamin, the personal security ninja.
More like the magic ninjas! AWW HELL YEAH!
funkydopeloven Xbox-Hq Genius
Joined: Nov 30, 2004 Posts: 1942
Posted: Sun Jan 02, 2005 11:00 am Post subject:
yep i think that pretty much sums it all up
custom-xmodz Xbox-HQ Freak
Joined: Aug 28, 2004 Posts: 796 Location: Wales, UK
Posted: Sun Jan 02, 2005 4:21 pm Post subject:
If your worried about your psu then test it with a multi meter while it's plugged in, but the one I have had sat here on my desk for ages powered up is still fine.
But now I have a swanky new regualted psu.
DJH
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yep i think that pretty much sums it all up
