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    This is my K7-Pro repair and comparison page.  Below, you will see two pictures of the K7-Pro by MicroStar, one before the modification (a good board that I keep as a spare) and the actual board after the modification was done.  If you look close enough at the after pic, you will notice all D-LEDs are green, as this picture was taken while the machine is running.  This is to prove that the board is actually operational. 

  Here, circled in red, you can see that the heatsinks are making contact with each other. The one in the middle is really the one to watch.  I don't really think the other two would matter so much, as they are both already in electrical contact with each other (through their common bus on the motherboard).  The two on the left share a common bus, as do the two on the right.  However, the two busses are 180 degrees out of phase, and will short out if contact is made between the second and third heatsink.  For this reason, there is a strip of tape between the two heatsinks.  But is this enough?  In most cases, yes.  However, there are times when it isn't, and for this reason, I have done the following modification (below).  
Here, in the green box, you will notice the 4 regulating transistors, blown up for better vision.  Note that, in the red circles, the heatsinks appear to be "damaged".  This is where I modified them in order to prevent the short.  I insulated all 4 heatsinks from each other when I did this, but as I noted before, it is only necessary to do this for the center.  You will notice in the center above (small red circle), that there is an air gap between the two heatsinks, as well as some more resilient tape.  In the big red circle to the left, you will notice some of that tape that was applied to the heatsink there. The fins on the heatsinks were purposely bent inward in order to ensure that there would be no contact between them.

This mod does require removing the transistors from the board.



Anyways, this is what I did to bring back a dead MSI K7-Pro motherboard back in September of 2000.  It is now the end of May, 2001, and this board continues to plug along in my LAN server, with that pictured "AMD-K7 Engineering Sample", a 650MHz unit made in Week 34 of 1999.  I have two more of these motherboards (including the one that lent itself to the picture on the left) in case I get more slot Athlons, because it is, in my opinion, the best Slot A motherboard ever made.  Yes, even better than the ABIT KA7!
See the white circles on the left?  These are the points on the back of the mainboard where you will have to do the soldering, both to remove, and replace, the transistors and heatsink mounts (they are soldered to the board, too.).




Be very careful if you do this.  I cannot be held responsible if you slip up and damage your board beyond repair.  You should know what you are doing, and be skilled with a soldering iron first.  If you should decide to do this, then good luck!  It worked for me, and I would like to share this with you.

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