[Gizmo]

Pin 7 is connected directly to power, while pin 5 is attached to an RC network. Theoretically, attaching to pin 5 should provide cleaner power because of the filtering. However, this has no bearing on your weird temp readings. We could leave pin 4 of the Attansic chip completely disconnected and it wouldn't make any difference to your temp readings, because we are not reading that chip. There are two reasons that we make mods to that chip:

1) The Attansic chip is attached to the CPU thermal diode. If we simply solder wires from the Winbond chip to the thermal diode, the two chips will interfere with each others' ability to read the diode. So we disconnect the Attansic chip from the thermal diode on the CPU.

2) Unfortunately, if we disconnect the diode from the Attansic chip, pin 4 is left floating, and the Attansic chip will likely go into OTP mode and shut the computer down. So we have to do something to essentially disable the Attansic chip. That something is that we tie pin 4 to pin 5. This pulls pin 4 high, making the Attansic chip think the CPU is quite cold, and everything is hunky-dory.

Since you are getting intermittent readings of -1C, I'm inclined to suspect that you have an intermittent short between pin 4 of the Attansic chip and the solder pad that it was originally attached to.

You can certainly wire up the kits mentioned in methods 2 and 3, however, bear in mind that these kits typically work better when using a shielded wire to carry the signal from the thermal diode. In our case, we don't have that luxury, because the cathode of the thermal diode is tied directly to ground at the CPU socket. In addition, if you wire up one of these kits, you will have to disconnect the wiring that you have done to attach the diode to the WinBond chip. Or am I misunderstanding your question?

P.S. Be really careful of your CPU. I have killed a couple of chips now because of this mod, since it disables the Attansic OTP, and the software function in the WinBond chip never gets a chance to kick in because the CPU locks up just before it goes bye-bye. I'm investigating how to go about biasing the thermal diode so that I can properly read it from the Winbond chip without having to disable the OTP function.