He's looking for the actual service manual or electrical diagram for the board.
Actual Factory Service manuals for motherboards are considered in-house design and fabrication documents. Not very likely to be available to the general public since these are considered part of a companies trade secrets.
A friend of mine replaced the southbridge chip for me, because it's stuck on win 7 logo. After that works for 3 months then it happens again. So i decided to buy a new chip, I thought may the chip went bad again. He soldered the new SB chip and it works, but after 4 months, same problem again. I think something is killing the SB chip.
Maybe heat is your problem, have you checked that?
If you use a graphics card the ICH would be covered, specially if you use a PCI card as well, limiting the heat dissipation and airflow.
We both have the same G41+ICH7 chipsets, though my motherboard is gigabyte G41MT-S2p. In my case I use a HD5750 graphics card and creative 2 audigy sound card.
They completely cover the SB. That's why I installed a 120mm fan blowing air strait between the cards into the SB heatsink.
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