QUOTE(m.player @ Jun 9 2009, 02:55 AM)
Hey everybody, a little bit of a bump here, but I did the transistor method myself with the exact-right model numbers from RadioShack.
Before I just direct-soldered pin 14 to pin 15 to keep it grounded and sent a red regular +5V to the red on the Xbox. That way I flip the switch on the powersupply and then hit the Xbox power button while the whole system and water pump started up already (even the HDD starts spinning directly wired to the motherboard--power and all--before I press the power button).
I OVERLOOKED ONE THING SINCE DAY ONE.
So I get an IC board at RadioShack as well today and even a new soldering iron tip...very happy. Wire it up perfectly and to my extreme confusion it didn't work (with a 100k resistor)...I checked AT LEAST seven times, perfect wiring because I kept going over it (because I ended up wiring my HDD cables backwards after thinking I checked them enough times).
The huge problem.
Though +5V to the 5VSB on the Xbox worked without a transistor or necessary signal, when using a standby function (as said on around page 3):Wire the red Xbox 5VSB wire to the purple 5VSB wire (pin #9) on the ATX power supply.
Very critical, otherwise (like briefly said without emphasis) IT WILL NOT WORK, don't bother thinking or buying other various ohms of resistors.
I couldn't believe it when I rewired the purple instead of red off of the ATX and just felt like such a goon. From the first day I worked on this project I cut off and tied that wire away thinking nothing of it.
This deserves a first post edit (maybe a repost with permission?) to be more clear. I was pissed and then realized my stupid mistake after reading all 5 pages of input.
Thanks for all of the useful & smart info! Couldn't do it without the community!
PS: My powersupply is a new quiet design, $39, 30A 12V rail, and 20A 5V...spent hours and found the best deal.
Pictures of my work:
Rear view of IC board:
Close-up of installation:
I followed this one and it works great...at first I get a RROD or sometimes it shutdowm I knew the PSU is not powerfull enough even its rated 12vdc 18a. I replace the ATX PSU to dual rail 12vdc 18a and works great.
Now I'm working on a new project I need everyones input here:
1) I found a schem diagram in the internet for Thermal Fan Control Switch...I've built it and its work.
2) What I want to do is when you shutdown the xbox I wan't the Fan still running until it cools the xbox that is why I built this Thermal Fan Switch control when it reach certain temp it shutoff the power. Because I saw it you tube heat test between Xenon and Jasper after the the shutdown the Xenon mobo temp still climbing approx 5-15c.
3) I was thinking about using relays using the +5vsb power from the ATX PSU or even the xbox PSU to power the fan.
4) I'm not sure which relay I need to use I was planing to use the car relays and wire them up.
Any inputs are appreciated...Thanks