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Pc Power Suply To Xbox


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#46 barusan

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Posted 09 June 2003 - 03:06 PM

Pheonix,

Are you talking about POK(POWOK) voltage? Not POWON?
Basically POK voltage comes from ATX power supply and goes to motherboard. If there is 3.3V on motherboard side, there should be more than 3.3V on ATX side.
POWON signal comes from motherboard and goes to ATX. When POWOK is around 3.3V on motherboard, there is around 0V on ATX side. When POWON is around 0V on motherboard, there is around 5V on ATX side.

Please make sure which voltage you did measure.

Pin assignment of the output connector Xbox V1.0/V1.1
1: +12V
2: +5V
3: +5V
4: +5V
5: +3.3V
6: +3VSB
7: GND
8: GND
9: GND
10: GND
11: POWON
12: POWOK

Pin assignment of the output connector Xbox V1.2
1: +5V
2: +5V
3: +5V
4: None
5: GND
6: None
7: +3.3V
8: None
9: GND
10: POWOK
11: +12V
12: None
13: +5V
14: GND
15: +3VSB
16: GND
17: None
18: +3.3V
19: GND
20: POWON

Pin assignment of the output connector ATX
1: +3.3V
2: +3.3V
3: GND
4: +5V
5: GND
6: +5V
7: GND
8: POWOK
9: +5VSB
10: +12V
11: +3.3V
12: -12V
13: GND
14: POWON
15: GND
16: GND
17: GND
18: -5V
19: +5V
20: +5V


#47 Pheonix

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Posted 09 June 2003 - 06:42 PM

thanks for the quick reply.

my PowON apears to be functioning correctly.
however even when the two PwrOKs are not connected, i'm still seeing ~3.254v coming from the xbox's side and 0v on the ATX.

i'm going to purchase another voltage regulator for your other schematic and will try it after work.

#48 desertboy

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Posted 09 June 2003 - 08:00 PM

This should be pinned, I think this is probably the most important new mod for the scene at the moment.


#49 pyro88

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Posted 10 June 2003 - 12:07 AM

any mod want to pin this?

#50 Pheonix

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Posted 10 June 2003 - 01:51 AM

update:
i tried using a voltage regulator instead of the variable resistor but the results were the same.

just curious, is the 5v from PwrOK present before the power button is pushed or even when the units are not connected?

#51 NightL1fe

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Posted 10 June 2003 - 04:21 AM

YES PIN IT PLEASE@@!!

crack it guys... soon we will be able to stick our mobos in pc cases with pc pwer supplys woooohooo laugh.gif

#52 RaGe

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Posted 10 June 2003 - 03:45 PM

ttt

#53 barusan

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Posted 10 June 2003 - 04:35 PM

QUOTE (Pheonix @ Jun 10 2003, 03:51 AM)
update:
i tried using a voltage regulator instead of the variable resistor but the results were the same.

just curious, is the 5v from PwrOK present before the power button is pushed or even when the units are not connected?

Pheonix,

Basically, voltage statement on Xbox motherboard side is

1.before power button is pushed
+12V : 0V
+5V : 0V
+3.3V : 0V
+3VSB : +3.3V
POWON : 0V
POWOK : 0V

2.after power button is pushed
+12V : +12V
+5V : +5V
+3.3V : +3.3V
+3VSB : +3.3V
POWON : +3.3V
POWOK : +3.3V

If your information is correct, there is a possibility that Xbox motherboard has a resistor or something between +3VSB and POWOK.

Please try the following schematics.
This one can pull down POWOK to 0V before power button is pushed.
user posted image

#54 dzv

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Posted 10 June 2003 - 05:03 PM

I just did some testing on the POK in my Xbox. My results:

With Xbox OFF, POK (measured at the motherboard) is 0v
With Xbox OFF, but POK line disconnected, POK measured at motherboard is ~3v

With Xbox ON, POK (measured at the motherboard) is ~3.3v
With Xbox ON, but POK line disconnected, POK measured at motherboard is ~3v

Strangely, as you can see, the Xbox boots even if POK is not connected. What does this mean? Can we forget about POK, since it doesn't seem to make any difference?

#55 barusan

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Posted 10 June 2003 - 07:08 PM

POK signal means that "The PSU shall output a Power OK (POK) signal to indicate that the 3.3V and 5V outputs are both above the minimum output voltage level, and that sufficient energy is stored in the converter primary circuit to guarantee the outputs to be valid for a time not less than the minimum holdup time specified. This signal shall utilize 3.3V logic levels."

When the abnormal condition is happened (e.g. AC plug was pulled off), POK signal goes to 0V and informs Xbox system that PSU will shut down immidiately.
If POK is always HIGH (+3.3V) and the abnormal condition is happened during system read/write data on HDD, the data (HDD) sometimes crash.

Normally there is no problem that POK is disconnected. But I recommend to use POK function for SAFETY.

#56 Pheonix

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Posted 11 June 2003 - 04:38 AM

using that schematic

btw, the PSU i'm using is a 70 Watt 12v DC power supply, in the tech documents, it states to need ~20ms to fully reach +5v and such ( not sure if that's relevant )

it's still not booting so this is while i, am not and am, holding the button.

PSU Xbox
PowOK 0v->0v 0v->0v
PowON 0v->3.3v 0v->0v

Edited by Pheonix, 11 June 2003 - 08:13 PM.


#57 Pheonix

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Posted 11 June 2003 - 08:13 PM

*bump* lotza activity in these forums

#58 desertboy

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Posted 11 June 2003 - 08:37 PM

This really needs to be pinned


#59 Tsharkou

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Posted 11 June 2003 - 08:58 PM

Why are you guys busting brain vessels on something that may not be possible and really is not worth all the trouble when you can jus do something like this? If you need assistance, I'll help.

#60 dzv

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Posted 12 June 2003 - 01:10 AM

Your case mod is nice, but there are a lot of people who would like to use an ATX power supply for their Xbox.

Besides, it is possible, I already did it smile.gif




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