Problem:

A BP6 motherboard [dual 466Mhz celeron cpu's] was only running on one cpu. this was after +20 caps was change after the famous bad caps on the BP6's.

Fault:

supply to the faulty cpu was only 0.8V [ Vcore 2] the running cpu had a supply of 2.0V[ Vcore1 ] [readout in Bios]

Solution:

Measuring on the board, one find that the 2 supplies for the cpu's are made from +5V steped down with a Feed-forward conveter made out of a IC [ CS51313 ] and 2 FET transistors [ Q7 & Q8 ]
This circut had no +5V supply, so, it did not work. I asume it is one of the coils on the board, that is br0ken, as a quick hack, a new wire was placed from +5V on the working Vcore1 and over to the defective Vcore2. and it works.
rule no. 1: dont mess with things that work, so not it stays there :-)

As I have no digi-cam, I have snatch pictures off the net, to ilustrate the board, please ignore the heatsinks on the Q7,Q8 ect. chipsets and such, this is not standard for the BP6, just a .jp geek who had too many heatsinks I think..