help! over temperature error / alert
in [Asus]
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From: Paul on 7 Jan 2006 05:56 In article <1136565265.640493.7350(a)g44g2000cwa.googlegroups.com>, "zark" <etc1760(a)yahoo.com> wrote: > > is there any way to reset the temperature sensor? do a diagnostic on > it? the external cpu temp sensor is now reading 40C. > In terms of a diagnostic, in theory you could take the processor, flip it over, and probe the two diode signals with an ohmmeter. But don't ask me to do the math to convert the voltage reading to a temperature :-) qVd/nkT Ifw = Is*(e - 1) Ifw would be the applied ohmmeter current, and Intel recommends a small current between 11 and 187 microamp forward bias. (Selecting an ohmmeter range that uses 100 microamp might work.) Vd is the voltage developed across the diode and displayed on the ohmmeter display. T is the applied temperature in degrees Kelvin (above absolute zero). See PDF page 83. http://download.intel.com/design/Pentium4/datashts/30235104.pdf On PDF page 30 of the Winbond chip spec, there is a table showing temperature register readout values from +125C to -55C. So, in fact, you don't have to do any math on the Winbond (whew!). The Winbond chip is using an internal lookup table, to convert voltage value into a temperature reading in degrees C. The only really puzzling thing, is why your readout is 124C instead of the max 125C. The implication here, is that your diode is open circuit. One of the two (CPU internal) diode pins is not making contact with the socket, or a connection is broken elsewhere on the motherboard. The diode could also be open inside the processor itself, but I would think Intel checked that before the processor left the factory. Paul
From: zark on 9 Jan 2006 07:20 so it seems that the temperature sensor is in error, but what i still cant figure out is why it will not slow/shut down the computer? Paul wrote: > In article <1136565265.640493.7350(a)g44g2000cwa.googlegroups.com>, "zark" > <etc1760(a)yahoo.com> wrote: > > > > > is there any way to reset the temperature sensor? do a diagnostic on > > it? the external cpu temp sensor is now reading 40C. > > > > In terms of a diagnostic, in theory you could take the processor, > flip it over, and probe the two diode signals with an ohmmeter. > But don't ask me to do the math to convert the voltage > reading to a temperature :-) > > qVd/nkT > Ifw = Is*(e - 1) > > Ifw would be the applied ohmmeter current, and Intel recommends a > small current between 11 and 187 microamp forward bias. (Selecting > an ohmmeter range that uses 100 microamp might work.) Vd is the > voltage developed across the diode and displayed on the ohmmeter > display. T is the applied temperature in degrees Kelvin (above > absolute zero). > > See PDF page 83. > http://download.intel.com/design/Pentium4/datashts/30235104.pdf > > On PDF page 30 of the Winbond chip spec, there is a table showing > temperature register readout values from +125C to -55C. So, > in fact, you don't have to do any math on the Winbond (whew!). > The Winbond chip is using an internal lookup table, to convert > voltage value into a temperature reading in degrees C. The only > really puzzling thing, is why your readout is 124C instead of > the max 125C. > > The implication here, is that your diode is open circuit. > One of the two (CPU internal) diode pins is not making contact > with the socket, or a connection is broken elsewhere on the > motherboard. The diode could also be open inside the processor > itself, but I would think Intel checked that before the processor > left the factory. > > Paul
From: Paul on 9 Jan 2006 20:38
In article <1136809226.698643.256010(a)g43g2000cwa.googlegroups.com>, "zark" <etc1760(a)yahoo.com> wrote: > so it seems that the temperature sensor is in error, but what i still > cant figure out is why it will not slow/shut down the computer? There are two diodes involved on the processor die: diode #1 -----> processor internal throttle function -----> processor internal overheat & shutdown diode #2 -----> feeds Winbond monitor interface The readings taken by the BIOS or by a utility when the OS is running, do not have to act on the information they are collecting. After all, it is known that diode #1 and the associated circuitry is autonomous and can protect the hardware well. The fact that diode #2 and its associated hardware are misconfigured, has no impact in this case. ******* To consider another case, there is an eight pin chip on an A7N8X family motherboard, that connects to a diode on an AMD S462 processor. If that chip is misconfigured (say the threshold is set too low), the motherboard will shut off. The reason it is implemented that way, is the old S462 processors didn't have any way to defend against overheating, so an external chip was used for CPU overheat prevention. It is more important not to fool with that 8 pin chip, unless you want a lot of nuisance shutdowns. In your current situation, the processor is already protected, and a faulty monitor chip or diode #2 is merely annoying. And diode #1 should be fully tested at the Intel factory. Paul |