Faulty Temperature Sensor?

Recently, I was given an old Mac g4 15" Powerbook that the owner no longer wanted. This is the first Mac I have owned as well as the first laptop. It worked fine for me for several weeks, and I got a new battery and upgraded the RAM. Then it started putting itself to sleep seemingly randomly, while I was in the middle of using it. It's fine for a little while upon turning on, and then may start to do this every minute. I changed the battery and memory back to the original pieces, the problem persists. The last time, it would not wake up at all. I finally took out the battery and power cord and held down the power button and restarted it.
Looking around online, I have found other people experienced this 'narcoleptic computer' issue with g4s, but no clear solution. The consensus seems to be a faulty trackpad temperature sensor sends the computer into sleep. I checked my system.log and found emergency overtemp warnings at the times it was sent to sleep. I downloaded Temperature Monitor and found that the trackpad temp would spike way up and down while the other temperatures remained consistent. Sometimes there is no temperature reported for the trackpad at all, at times it behaves normally until the computer is jostled, leading me to believe it might be an issue with something come loose.
Is this something that has been resolved? I saw a couple suggestions to open it up an remove the trackpad temperature sensor entirely, does anyone know if that fixes the problem in the long term? I have also tried resetting the pram and the pmu, setting the power saver preferences to never put it to sleep, trashing my power saver preference files, disabling bluetooth, and running the computer off the power cord only with no battery. Next I will try opening the whole thing up and tightening everything I can see to tighten.
I know it's getting up there in years, but the computer worked fine for what I wanted until this started. I would be very grateful for any advice on how to deal with this issue.

Hello Kate,
The track-pad heat sensor is +*one of the causes*+ of narcoleptic powerbooks, but from my experience it is more usually related to a faulty keyboard. Sticky or bent keys, dirt, soda, faulty light sensor are more likely the cause. It is highly unlikely anything has become lose inside the machine as all factory fitted screws are sealed with a lock-tight adhesive or equivalent. Try turning off the illuminated keyboard (F8) and see if it persists. Opening the machine is not a bad idea although, you will find very little in the way of visual determiners. Open it up and give it a good clean out. A small soft paint brush and a can of compressed air will do the job. Just be careful to blow the garbage out and not deeper into the machine.
A suggestion to pin-pointing the problem: Can you hook it up to an external display, keyboard and mouse? If so, start the computer, close the lid and wake it with the external mouse. See if the problem persists. If it does, at least you know the track pad sensor is fine and it must be related to the keyboard or a general overheating issue, which may be something as simple as a faulty stick of RAM.

Similar Messages

Faulty temperature sensors on Macbook Pro Retina??

I got a Macbook Pro Retina 2.7 GHz Intel Core i7 16GB ram with solid state driving running 10.8.2 about 3 weeks ago and for the most part it's run quiet, even when I would use it on my lap and it would get a little hot, the fans never got really fast. Last night I ran Folding@Home for the first time and the fans got really loud. Now, this didn't surprise me as I was using a program that probably uses a lot of the CPU. I shut down and left my machine off all night. This morning the fans turned on ~15 seconds after startup. No programs running, and the computer is on a cool surface and is cool to the touch, but the fans are going crazy. So and reset the SMC (at least I think I did, shut down, power cable in, held contro, option, l-shift and power for at least 10 seconds, although nothing happened that indicated that there was a reset). Problem persists. Computer is COOL, fans start up almost immediately. So I installed SMC fan control to monitor my temperature. Upon startup it read at room temp, then spikes up to 200 F and the fans jump up to ~4500 RPM. Now, there is NO WAY that my machine is that hot right when I start it up, it's completely cool to the touch and has been sitting on a marble table in a cool room. Has anybody else been having problems like this?

thanks for the reply. I ran the AHT by rebooting and holding D. While a ran the test there was no fan noise. The test found no probems. After restart the fans speed up again. Since my last post I've installed the iStat widget. My temperature (F) and fan speed readout is as follows:
HD: Macintosh... 112
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Faulty CPU temperature sensor

Hello,
I am sorry if this is covered already in another topic.
Today I went to the local Apple service center to give my MacBook Pro 15 (OS ver. 10.6.8) for maintenance cleaning and a change of the thermal paste of the CPU. I got a call a few hours later and a technician told me I need to change my mother-board, because the heat sensor of the CPU gives incorrect temperature and the FANS start spinning at 6200 RPM without the processor to be loaded so much. (The price was too high ofc)
Well I know that if I start a graphic software or a game then the temperature and the fan speed rise but thats perfectly normal and logical. Though I have seen it many times the moment I start a game, temperature softwares like: Fan control or IStat Nano show around 30 or 40 degrees increase for just a few seconds which is not possible. And vise-versa the moment I turn off a game it drops to 50 or below degrees. I tried something else - turned on the laptop after it was cooled down to normal room temperature and started - Parallels Desktop /Windows XP then Heroes of Might and Magic V and loaded a saved game without actually doing something, just to check the sharp increase of the CPU temperature...it shows 108 degrees, though the body of my laptop was perfectly cool (where the CPU is placed). I think is impossible to generate such heat in just 2 seconds. The interesting thing is that the moment you stop it it drops to 45 degrees.
Please advice if you have any ideas. I can not afford to change my MB at the moment and the laptop guarantee has expired 1 year ago.
P.S I was thinking to increase the upper threshold of the Fan Control (now is set to the default of 80), though I am afraid to speculate with this...

If your cpu tries to exceed it's maximum rated temperature it will immediately shutdown (crash).
Just because you have Parallels at full screen does not mean that other applications stop running. Everything that was running before you went to full screen for Parallels continues to run in the background.
Graphic intensive games can put a very large load on the cpu. They can also draw power from the battery while using AC power.
Your fans should be idling (2000 rpm) when the temperature is less than 70 degrees C. Somewhere between 70 and 75 C they should begin to speed up. A 100% sustained load on the cpu will have the fans at maximum rpm as long as the load continues. If your MBP can handle this sustained load without shutting down the heat transfer from the cpu is correct.
It is very unlikely that the temperature sensor for the cpu is bad since it's part of the cpu chip.

Help with Omega Infrared Temperature Sensor with USB Interface Model(s): IR-USB

Hi,
I am a beginner when it comes to labview and was wondering if the IR-USB sensor by Omega was compatible with LabVIEW and whether anyone has worked with them before in lv. I also want to find out whether the vi for this sensor is easily available. I am not too sure about which infrared temperature sensor will work best with lv.
Thanks

Hi,
It appears it isn't compatible straight away. It is designed to talk to the software provided by Omega and they don't appear to provide drivers for development in other programming languages.
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========
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Lenovo G550 GPU temperature sensor

Hi everyone,
I have lenovo G550 laptop and there is a problem with GPU (NVIDIA GeForce G210M) temperature sensor. So, when i turn on laptop the sensor is showing 'bout 70°C and when i run some programs like Chrome, paint etc. the temperature jumps over 95 °C. But the problem is that laptop is COLD , temperature is OK. The air from fan is COLD, not warm.
I have opened it and cleaned it from dust, it's clean like in pharmacy store. When temperature reach 100°C the laptop turns off automatically but it is still cold :/.
. I updated BIOS and it's even worse :/ sensor on start show 90°C and then raising :/. I also tried serval diferent versions of NVIDIA drivers.
So, maybe it's hardware problem with sensor, and i'm wondering is there anyway to deal with it? Or how can i set the the max value of temperature where laptop shut down automaticallly (there is no such option in BIOS) ?
Thank you.
Solved!
Go to Solution.

I solved it,
the problem was in thermal paste and some protective nylon over GPU. The nylon was detached on some parts and I removed it at all. Then noticed that there is a litle bit of thermal paste on one of the components on GPU. I cleared it, and temperature is 50°C. The thermal paste probably covered temperature sensor and cause a false reading of sensor.
Thany you for reading

LM92 I2C temperature sensor with NI-8451

Hello !
I try to communicate with a LM92 temperature sensor via the NI USB-8451 by I²C protocol. I have an issue with the addressing because the 7 bits sensor address is 1001011 (A1 and A0 set to 1) but the LM92 is working in little endian (LSB first) and Labview adds the R/W bit at the end of the address so the complete frame sent to the LM92 is 1001011R/W.
I'm trying to find a solution to invert the complete frame before seending it in order to communicate with the LM92.
Labview returns the error -301742 because the address is not the wright one and i can't find how to send the adress in little endian.
I just need to read the temperature register of the sensor so i don't need to write anything in it.
Does anyone have an answer ?
Solved!
Go to Solution.
Attachments:
LM92CIM.pdf ‏773 KB
Temperature read.vi ‏17 KB

Sanguigui wrote:
Hello !
I try to communicate with a LM92 temperature sensor via the NI USB-8451 by I²C protocol. I have an issue with the addressing because the 7 bits sensor address is 1001011 (A1 and A0 set to 1) but the LM92 is working in little endian (LSB first) and Labview adds the R/W bit at the end of the address so the complete frame sent to the LM92 is 1001011R/W.
I'm trying to find a solution to invert the complete frame before seending it in order to communicate with the LM92.
Labview returns the error -301742 because the address is not the wright one and i can't find how to send the adress in little endian.
I just need to read the temperature register of the sensor so i don't need to write anything in it.
Does anyone have an answer ?
I do not have the USB-8451 to check this myself, but based off of this document: http://www.ni.com/white-paper/5767/en/ I would guess you should be looking into these two VIs:
Advanced LabVIEW API for Device Addressing
Use the Script Address + Write or + Read Functions after a Script Issue Start function to program the device address.
Note: This, however, is just a shot in the dark. It seems like deep down they are calling a library, so it may be out of your control unless you have access to the library being called as well.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If someone helped you out, please select their post as the solution and/or give them Kudos!

Do we have driver available for Lake Shore Model 128 temperature sensor?

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Hi Marivell,
Take a look at ni.com/idnet. A quick browse found Lake Shore Cryotonics Temperature meters here: http://sine.ni.com/idnetwork/main/p/sn/n25:LM/sb/navsRel?q=lake+shore+temperature&x=0&y=0
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Can SCC-RTD01 be used with Cernox RTD's, silicon diode temperature sensors?

Hi,
Can the SCC-RTD01 be used with negative temperature
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I was planning on using the SCC-RTD01 with platinum
resistance wires, but want a screw mount type sensor. Couldn't
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Mark,
Thank you for contacting National Instruments! When you configure an RTD channel in the Measurement and Automation Explorer (MAX), you have the option of choosing from a list of "standard" RTD's or entering your own polynomial expression as the temperature coefficients. Therefore, negative coefficients shouldn't pose a problem. Also, I don't see any reason why a silicon diode temperature sensor would pose a problem either.
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MOVED: K9A2GM-FIH GPU temperature sensor

This topic has been moved to Overclockers & Modding Corner.
https://forum-en.msi.com/index.php?topic=124586.0

Quote from: Frankenputer on 22-February-09, 04:17:51
Run GPU-z or HWmonitor, but my guess is no, it doesn't have a temperature sensor. Won't hurt to try.
GPU-z: http://www.techpowerup.com/downloads/1333/TechPowerUp_GPU-Z_v0.3.2.html
HWmonitor: http://www.cpuid.com/hwmonitor.php
Tried it, but no GPU sensor. I'm trying to get the most of the onboard HD 3200 GPU, but doesn't want it to get too hot. Any tips? The GPU's MHz is now running at 600 MHz, instead of the default 500 MHz.

No CPU temperature sensor on Intel based Mac mini?

Does new Intel based Mac mini has no CPU temperature sensor like the first, PPC based, Mac mini?
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Every time a new model Mac comes out, the temperature monitoring utilities have to be updated. Obviously, the insides of the Intel Mac mini is different from the PowerPC Mac mini. The folks who write those kinds of tools can't see into the future and write a utility that will work on computers that haven't been released yet. Just give them a little while to catch up!
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Can FieldPoint be configured for use with 4 wire temperature sensors?

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The excitation is fixed at 2mA x 135 mS with a period of 1S. Fine for an RTD, don't know about your Hall sensors.
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Scb 68 temperature sensor

Hi All,
Is it possible to read the value of the internal temperature sensor of the SCB68?
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Hey Oliver
The value read would be a voltage so would need scaling. The temp sensor in the SCB 68 is used to calculated the CJC of a connected temperature sensor. Below is a useful link on how to do this.
http://digital.ni.com/public.nsf/websearch/7F2EA1FE43537A0E8625652200522718
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www.ni.com/ask

GX70 - Temperature Sensor

Hello Everyone,
Problem description:
I have noticed that temperature sensor indicator stops updating when I plug in VGA cable to my laptop (TV and monitor checked)
When VGA cord is not plugged everything is OK.
GPU temp sensor works fine and also in AIDA64 sensors for CPU 1 to 4 core works well. Unfortunately Fan speed is connected to Overall CPU sensor.
Looks like if VGA socket is busy temperature sensor hangs.
Example:
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Anyone has or had similar problem?
I have latest BIOS, Firmware and AMD Video Drivers installed
BIOS : E176KAMS.10G
AMD Drivers: 14.4
I have also checked previous BIOSES and Video Drivers. No effect. Same issue.
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..or..
Did anyone know how to connect fan speeds table to GPU temperature instead of CPU temperature table in EC?
That would more or less solve my problem since GPU and CPU units are connected by same heat pipe and have very similar temperatures.
BTW
This looks like a bug in Firmware or BIOS to me. What do you think?
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Best way to have hard drive temperature sensor replaced?

Hi all—
During an attempt to upgrade the hard drive in an early 2009 Mac Mini, I accidentally severed the connection between the hard drive temperature sensor and the interconnect board. I've confirmed with a friend knowledgable in this area that there is no reasonable way to solder it back on or otherwise fix it as it currently is.
From what I can tell, I can either use a software hack to override the Mac Mini's fan speed, which I would prefer not to do, or I can have it replaced by a professional [I don't feel comfortable making such an in-depth repair on my own, especially since what should have been a simple drive swap has rendered the computer unusable, unless one can tolerate it sounding like a hair dryer].
Does anyone have any recommendations on where I should take the Mini to get repaired? I've read online that Apple does not sell the interconnect board on its own--you have to buy a hard drive already attached to it. That would be fine, but is this the type of thing that a Genius will work on, or will I need to venture to an "authorized" repair facility? Any nudge in the right direction would be greatly appreciated.

bvogts wrote:
Hi all—
During an attempt to upgrade the hard drive in an early 2009 Mac Mini, I accidentally severed the connection between the hard drive temperature sensor and the interconnect board. I've confirmed with a friend knowledgable in this area that there is no reasonable way to solder it back on or otherwise fix it as it currently is.
Ouch, I know exactly what you mean. One of my friends had that on her Early 2010 Mac Mini, I had to redo the connector with a new wire and then solder that to the end of the existing wire on the HDD. Difficult work when she severed in in two places
bvogts wrote:
From what I can tell, I can either use a software hack to override the Mac Mini's fan speed, which I would prefer not to do, or I can have it replaced by a professional [I don't feel comfortable making such an in-depth repair on my own, especially since what should have been a simple drive swap has rendered the computer unusable, unless one can tolerate it sounding like a hair dryer].
I would stay well clear of all hacks to Apple hardware. They always get detected and get wiped out every time you update to the latest OS X update, for example OS X 10.7.1 to OS X 10.7.1.2 when it comes out. This will mean you will have to redo your hack; it could be much more frequent than that.
bvogts wrote:
Does anyone have any recommendations on where I should take the Mini to get repaired? I've read online that Apple does not sell the interconnect board on its own--you have to buy a hard drive already attached to it. That would be fine, but is this the type of thing that a Genius will work on, or will I need to venture to an "authorized" repair facility? Any nudge in the right direction would be greatly appreciated.
If you are not comfortable with doing the repair then take to to an authorized repair facility or buy the part of eBay as you can get them at a reasonable price. I have just looked for you and there are loads, in the UK, where I am and in America too. You can then take this part and they will swap it over for you, with a small cost, but it will solve your problems properly and will stop your Mac Mini sounding like a hair dryer!
I hope this helps, if not then give me some more details, I am happy to help!

Interfacing temperature sensor LM35 with Labview

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Sorry no Danny, thanks to Dennis_Knutson,
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Faulty Temperature Sensor?

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