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Help locate CPU pins

post #1 of 4
Thread Starter 
I have a Pentium 4 2.8ghz socket 478 (I'm assuming since it has pins) cpu out of a laptop and I'm reading the guide on how to make a CPU hotplate and it says I can find the power and negative pins in the data sheet. I've been searching google and found a few pdf datasheets for the Pentium 4's but none of them actually show you where the power/negative pins are located. Can you help? Thanks.

Edit: So I finally found one with a diagram http://download.intel.com/design/Pen...s/24988703.pdf

Page 52, I'm having trouble reading the pic it's really blurry. There seems to be quite a few "power input/output" "power input" and "power output" pins. I'm guessing I just feed the power to any of the input pins and the negative to any of the output pins. Can anyone confirm this?

Also I'm not sure which way is up, they mention (As Viewed from the Top of the Package) but it doesnt show the corner triangle as reference.
Edited by thx1138 - 10/12/11 at 9:33pm
post #2 of 4
Quote:
Originally Posted by thx1138 View Post
I have a Pentium 4 2.8ghz socket 478 (I'm assuming since it has pins) cpu out of a laptop and I'm reading the guide on how to make a CPU hotplate and it says I can find the power and negative pins in the data sheet. I've been searching google and found a few pdf datasheets for the Pentium 4's but none of them actually show you where the power/negative pins are located. Can you help? Thanks.

Edit: So I finally found one with a diagram http://download.intel.com/design/Pen...s/24988703.pdf

Page 52, I'm having trouble reading the pic it's really blurry. There seems to be quite a few "power input/output" "power input" and "power output" pins. I'm guessing I just feed the power to any of the input pins and the negative to any of the output pins. Can anyone confirm this?

Also I'm not sure which way is up, they mention (As Viewed from the Top of the Package) but it doesnt show the corner triangle as reference.

First, see page 11 of the pdf file that you linked. It indicates that there are eighty-five Power pins and one-hundred-and-eighty-one Ground Pins (ie 85 Vcc for Power and 181 Vss for Ground).

The bolded part above is incorrect. You do not ''...just feed the power to any of the input pins and the negative to any of the output pins''.
Instead, connect the power (red) wire to any one of the 85 pins for Power and connect the other (black) ground cable to any one of the 181 pins for Ground.

''As Viewed from the Top of the Package'' means viewing the CPU from above, ie looking down onto the IHS.

See diagram below for my annotation for the coordinates.

However, that pdf file seems to refer to Pentium 4 (1.4 to 2.0 GHz). But yours is a 2.8GHz version and so I suspect it should be the pdf file below which is for Pentium 4 (2.0 to 3.4 GHz).
http://www.intel.com/design/pentium4...hts/298643.htm
(the file name is 29864312.pdf)

This pdf file (page 15) indicates there are 85 Vcc pins for Power and 180 Vss pins for Ground.
Page 43 has the coordinates. Just magnify the diagram and you will see they are the same as mine above.

Finally, here is pictorial guide for making a hotplate.
http://www.sustainlane.com/reviews/h...73TB4IDB9K7AQI

I hope this helps.
post #3 of 4
Thread Starter 
Thank you very much for the informative post. As soon as you said the top down view was looking at the IHS it all made sense. Also thanks for clarifying VCC and VSS. Using those two pieces of information I finally have myself a cpu hotplate.

It gets pretty hot on it's own, hot enough to burn you if you hold your hand on it for more than 1 sec. But when I place it on a small thin sheet of metal for 15min it barely warms it. Interesting project none the less. I wonder how much it would increase the heat if I stuck another usb on a seperate set of pins


Thanks again
Edited by thx1138 - 10/13/11 at 12:45am
post #4 of 4
I was trying to do the same, i have a 2.7 GHz intel celeron from a dimension 2350. Where can i find the pins?

Edit: this is what it says on top of the CPU: Intel 02
CELERON
1.70GHZ/128/400/1.75V
SL68O COSTA RICA
3302A 130-0292
Edited by AlexGeek - 4/19/14 at 11:51am
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