3.3V supply for nand reading/writing

[Benno]

I saw a post here, can't remember who from, but he posted an image for 5V supply to the 360 nand, that you could use instead of plugging the PSU in.
The image was similar to this.


When I checked those points with a multimeter, they actually read out 3.3V which is what voltage the nand needs.
Putting 5V across there would be dangerous to the nand I would assume.

I decided to look for a point where I could apply 5V and use the boards components to reduce it to 3.3V.
Looking around with a multimeter I found this point which read out 5V and is conveniently on the same header as used for the nand programmers.



I'm wondering if that would work at all? Because then I could just use the 5V straight from a USB nand programmer to power the chip instead of plugging the XBOX in.

Thanks

Benno

[n00bpwner360]

What I would do (I don't know if it's safe or not) would be plug 5v into the 5v standby pin under the main motherboard power connector.

[Benno]

I can't see it damaging anything. I might just do it and measure to see if I get 3.3V at the nand. I just have to remember to unplug the PS before I do it lol. I'm sure that would damage something hehe.

[Blackaddr]

I can't see it damaging anything. I might just do it and measure to see if I get 3.3V at the nand. I just have to remember to unplug the PS before I do it lol. I'm sure that would damage something hehe.

The buffered jtag schematic I posted includes a regulator to create 3.3V from 5V with the idea being you get 5V from the power connectors in the PC itself.  Then you supply the buffer chip and the NAND with 3.3V so you don't need to plug in the MS power supply.

http://www.xboxhacker.net/index.php?topic=12257.0

[Benno]

Yeah that's an idea, thanks, but I'm wondering if it is doable by just applying 5V straight to the XBOX board.
And whether the onboard regulators would do the job for you.

[Blackaddr]

Yeah that's an idea, thanks, but I'm wondering if it is doable by just applying 5V straight to the XBOX board.
And whether the onboard regulators would do the job for you.

If you are going to provide +5 to the board then I think you need to do it at the power connector.  You should be able to get the pinout with some searching.

[Benno]

This site is pi@#ing me off how it working and then it isn't. Put a post on here before and now it is gone 
Yeah found the pinout for the power plug. It connects directly to the point from the second pic from the OP.
I hooked 5V up to it and it shows 3.3V at the nand. It seems to have worked!

Next step is to try and read/write the nand.

Cheers for the ideas guys.

[Blackaddr]

This site is pi@#ing me off how it working and then it isn't. Put a post on here before and now it is gone 
Yeah found the pinout for the power plug. It connects directly to the point from the second pic from the OP.
I hooked 5V up to it and it shows 3.3V at the nand. It seems to have worked!

Next step is to try and read/write the nand.

Cheers for the ideas guys.

Sorry the site isn't meeting your quality expectations.