Heat Sensor Temperature chip replacement

I have been battling the high fan speeds, tried everything suggested on this great forum. I recently installed G4FanControl and to my surprise it opens and doesn't even recognize any of the 3 sensor temps or threshold, just says "n/a" So, my theory is that my heat sensor temperature chip is bad and I need to replace it.
Here is my question. I noticed a heat sensor chip located above the hard drive, I even went to great lengths of moving it to the back of the tower for better airflow, no luck. Is this the actual chip I need to replace? or is there another one I am missing. All my fans run at constant speeds, not turbo jet, but very loud and constant. CPU temps are only 27.9 C.
has anyone replaced this chip with any success? Here is a link to one listed on ebay.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260310799941&trksid=p3907.m32&trkparms=tab%3DWatching
It looks like the chip near the hard drive. Part number 922-6559
Thanks

yes, the recalibration was free! they did order the heat thermal sensor part, it was $14.00. However, I didn't need it and they didn't charge me for it. The disc was interesting, It was a burned copy and had no name on it. They were very secretive with it. I asked what the software was called and he didn't really answer my question. It was some sort of trouble shooting software that ran for 20 min. and told what, if anything, was wrong with your computer. It said my CPU's were failed in the beginning....which is false because my computer ran just fine prior. He seemed to know right away that all it needed was to be recallibrated. And he was right!

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IMac Intermittently Won't power on...bad heat sensor maybe?

So, I have a mid-2011 iMac 21.5" that I am having some apparent power issues with.
Note : About 8-10 months ago, I had the screen replaced under AppleCare due to a discoloration that started in the upper left corner of the LCD. I am not sure if this has any relevance, but wanted it included.
A couple months before this, I was experiencing an issue where the Mac would shut down on its own, hard, and then wouldn't turn back on. No bios post, no chime, no CD-rom noise, no nothing. I thought something was fried, and became very worried. I unplugged it for several days, and setup a Genius bar appointment. Before going, I decided to plug it in and try one more time. To my surprise, it worked and booted as if nothing at all was wrong. It ran for several days, and then did the same exact same thing. Turned off, wouldn't turn back on, left it unplugged for several hours, came back, worked fine. It continued this process for about a week or so off and on, as I troubleshot, but then eventually just stopped occurring and worked great.
Then a few weeks later the LCD went bad as described above, so I had it replaced. All was still fine after getting it back. We moved to a new home, and didn't have any issues for about 6 months or so, until the last 2 weeks, when the issue has started again, and is much more frequent. At this point, if I plug the iMac in, it will last for only about an hour at most, then will not turn back on until I leave the power cord unplugged for a couple of hours. I am testing it currently with varying amounts of time having the power cord unplugged. For example, incident occurred and I unplugged for 30 minutes. I then tried to plug in and turn on, and was greeted with the CD-Rom sound, and about half a chime, then it died. Almost like it is "charging" something inside that isn't holding power maybe...? I have entertained the thought that maybe the heat sensor either is going bad, or maybe it is getting hot inside, causing it to turn off, although I must say, the outside of the casing of the iMac is literally cool to the touch. For the past 6 months, the computer has been stored and used in a half-finished basement room, that at times can get to as low as 55-60 degrees fahrenheit, again not sure if that has any relevance.
I have tried resetting the SMC obviously by leaving it unplugged for so long, and I have tried resetting the PRAM/NVRAM by holding COMMAND+OPTION+P+R until the computer reboots, but this has had no effect on the machine and this issue.
I assume that since it won't even post to the Bios or chime, that this is likely not a hard disk issue? My biggest fear would be logic board of course.
My next step in troubleshooting is going to be to leave it unplugged for the next few hours, then hopefully get it to boot, install a temp monitoring program like iStatMenus or iStatPro and monitor to see if it is reporting a steep temperature increase, and go from there. If it is reporting a high hard disk temp, then I can try booting from an external hard disk and see if that has any different effect.
Anyone else have experience with this? If the temperature isn't actually high, but just reporting high, then I assume I will need to replace the Ambient Temperature Sensor, which looks fairly involved based on the iFixit article, would possibly look at having Genius Bar perform. Is there a way to disable the temp sensor temporarily to see if this is possibly the cause of the issue? I assume not, since if used incorrectly, you could seriously damage your machine.
Thank you everyone,

Unfortunately there is no cheap way to diagnose, I don't believe Apple charges for a diagnostic however it does require you take the machine to be looked at. You can also speak to an AASP and find out what they charge for a diagnositic, however even if you are able to physically do the repair yourself you have to locate the part(s( and Apple does not sell individual parts to consumers, they only do this to AASPs. However you can look on E-Bay but then a) aren't sure the part you buy is OK and b) are not 100% sure the part you buy is the offending part(s).
In short, it's probably cheaper to have a professional diagnose the issue and fix it.
Good luck!

Random Shutdown Because of Heat Sensors?

I bought my white MacBook in mid-May (week 19 production) and it worked fine with the exception of a whine when I did not have the iSight Cam on, the occasional mooing after using the computer heavily then using the CPU lightly for a while, and the discoloration. If you ask me it wasn't that much of a set back because this computer was fast and reliable... or so I had thought!
All of a sudden about a week ago, after I had the discoloration fixed, thanks to AppleCare (which only took 5 days), my computer shut down randomly in the middle of light usage...
At first I had thought that my external hard drive was the problem and I was very upset that this had happened. I tried to reboot my computer, but all that would happen was the usual DVD drive start up sound and then it would turn off again. I tried about 5 times to restart it with no luck, so I walked away. About 20 minutes later I was able to start it back up...
After not using my external hard drive for a day, it happened again, in the middle of normal internet browsing and listening to music it randomly shutdown. I thought that maybe it was an OS 10.4.7 issue, because I had not had any problems with x.6, so I erased and restarted from scratch, and once again, another MacDeath. Once again, I thought it to be my fault in my installation of 2Gb of RAM. I re-installed the custom 2x256 RAM that came with the computer ( and will remain in my hands forever, because you can't even pay someone to take away a stick of 256Mb RAM these days) well after the old RAM was forcefully shoved back in, it died again! This is when I started to get mad...
I put up with the whinning, I put up with the heat, I put up with the discoloration (for a while), but now this? WHY!
Over the next week it happened almost daily and sometimes when I would turn on my computer after it being off for at least 5 hours, it would load my home screen and after about a minute I would hear the fan come on for a few seconds, and then it would die again. I noticed that most times that my MacBook would shutdown unexpectedly, the fan had just turned on for a few seconds or I was playing a game and the fan was already on...
So today I called AppleCare and I had to wait about 30 minutes before I talked to someone... (When I called last time about discoloration, the wait was about 5 minutes) So either there are more and more angry customers calling, or Apple is firing employees to increase their stock value...?
When I finally got through the man told me that it was most likely not the Logic Board, but instead FAULTY HEAT SENSORS and/or FAULTY HEAT SINK APPLICATION. I won't lie I have seen Core Duo Temp show readings as high as 91 C (about 196 degrees F). I knew that this things got hot, but not so hot as to start a fire if left on too long....
So I am getting a box from DHL tomorrow (woohoo) MacB. and I get to part ways again, but this time, from reading many threads, I assume our time apart will be much longer approaching around 2 WEEKS!!!
All I hope is that AppleCare will fix the heat sensors that are supposed to shutdown the computer when it gets overheated.... I have to go to school in about a month and I will not have time to deal with these kinds of issues! I really like the MacBook and all of it's features, but I did not sign up to get a MacDieOnMeBook!
APPLE USE SOME OF THE 24% SALE INCREASE THIS QUARTER TO HELP YOUR LOYAL CUSTOMERS WHO HAVE BEEN WITH YOU THROUGH THE GOOD AND THE BAD!
MB 2GHz White 2GB RAM - 250 GB External HD Mac OS X (10.4.6)

As of yet i'm not exactly sure about the heatsink problem, although a few in here have reported machines that work well after having this part replaced, while others who only had the MLB replaced reported a recurrence of the problem.
as for the volume indicator, i noticed that mine did that too, but it was in fact muted whether or not the tool bar indicated it. i dismissed this as a small quirk, similar to when my volume indicator didnt change as i pressed the volume buttons on my old laptop. but so long as there was an acknowledging "squirt" noise on the computer indicating change of volume, that shouldnt be a problem.
good luck withyour MB

Disabling Heat sensor?

My computer keeps shutting down, I think that it thinks it is running hot, but I feel the back and it is a normal temperature. My X Resource Graph says I am at 200 F, there is no way it is running that hot!
My fans REV up and go loud, but then the computer shuts down.
I usually have about 5-10 mins of usability on the machine.
It's been doing this for 3 weeks.
I have reset the SMU, PRAM, NVRAM, and nothing!
Can I disable the heat sensor so I can use my computer?

You definitely have a heat problem, I would call Apple as soon as possible, in the meantime, make sure that you have a bootable clone of your system, I use a firewire external drive and SuperDuper!.
There is no good reason to disable the heat sensor, it is there to protect the computer. Look at your Console system logs for any entry that say something like "maximum temperature exceeded for 30 seconds", that will tell you why your computer shuts down.
If you know your model, you might be eligible for one of these programs power supply or video and power issues.

Heat Sensor & Battery Question

Hi
Recently bought a used Macbook pro 2.4. While the guy was a schyster, it worked ok for a few months. But it started locking up on me and could not do a wakeup from sleep, and unable to do a hard reboot. Happened 3 times at critical moments so I got a replacement. In the meantimke took it to Apple Store Genius. Afetr keeping it for a day they said that:
a) the charger I was using had been swapped to a 60W one from a 13" MBP
b) the heating sensor on the logic board was bad. (It had gotten super while in comatose mode)
c) I swapped a full battery in from my duplicate MBP but I could not start it. After a day it did start so did a backup and moved on.
Does this sound like something the low power is causing which would be solved by replacing the charger?
Or is there a way to check the sensor with correct charger attached?
Thanks
Enio Cordoba

Thanks for the solution. I thought that was the answer but wanted to be sure. I took it apart, cleaned the processor and heatsink, then reassembled with new grease and all is well. While at it I changed the BIOS to enable the fan full time when plugged in. Is this necessary or should I disable the fan full time?
Thanks for the solution and help
Kevin

Heat Sensor on SATA Drive (iMac G5)

The hard drive on my iMac crashed and I am in the process of replacing it.
I followed the "any SATA is OK" rule and bought a Seagate/300 750G.
As I try to install it, I see the it does NOT have any attachment point for the small heat sensor wire.
Does that mean it doesn't need a heat sensor? Is it OK to just let the wire dangle? Or should I go back and get a different kind of drive?

Dennis - I see you have vowed to make backups regularly, the easiest way, I have found, is to use SuperDuper!, it will make an excellent clone of your system, and then it makes regular scheduled incremental back-ups. You set the schedule and as long as you remember to have your firewire drive connected, you're all set! The first clone will take a long time, the following incremental back-ups are much faster, I schedule them for very early in the morning, before I get up, so the computer is all set without being used to write the backup.
Hope this gets you started on the virtuous road,
Miriam

Fan Runs With Case Open Bad Heat Sensor?

I have an HP Pavilion 670y. I have a fan that runs for long periods of time and then stops and then starts again. I decided to run my computer with the case open to make sure which fan was running before buying a new power supply if it was that fan. Found it was the lower fan. The fan has less stops and starts with the case open but still has periods where it runs for a few minutes and then stops and starts. Since I have the case open I can't see how the computer could be overhaeting. Could it be a bad heat sensor? If it is can the heat sensor be replaced or is it hardwired?
This question was solved.
View Solution.

The HP support does not find a PC with that model number, however, units with a number of that nature of number are usually older units.
It is not clear as to what fan is considered the "lower fan". The case fan may do as indicated, but a fan on the CPU or video card do not normally cycle. Maybe include a picture? Click on the tree icon next to the chain "link" or ladder "video" icon to post a picture.
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HT1212 my ipod screen is cracked and i can't sync my ipod on to itunes becauseit it is locked with a password and i can't enter the password because the heat sensor is messed up and i don't want t restore it and lose everything so how can i get passed tha

My ipod screen is cracked and i can't sync my ipod to itunes because it is locked with a password and i can't enter the password because the heat sensor is messed up on the ipod becasue of the screen and i don't want to restore it and lose everything. What can i do?!

All you can do is to restore and thus erase the iPod unless you can get a data recovery company to preserve the data.
Place the iOS device in Recovery Mode and then connect to your computer and restore via iTunes. The iPod will be erased.
iOS: Wrong passcode results in red disabled screen
If recovery mode does not work try DFU mode.
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings

GPS Chip replacement in Nokia N 97

I am aware now that there are many N 97 owners having problems with thier GPS .. i was wondering if anybody has had the chip replacement done that Nokia are offering for free ( i have read this on here)
if anybody has had this then can you please reply and give me some details of how long it takes and if you did actually get it free or pay for it .. if you had to pay for it can you let me know how much it cost?
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Have you installed the new Ovi Maps 3.03 ? I haven't had gps repair , but signal is much stronger with new maps ! Don't know why, but it is.
If I have helped at all, a click on the White Star is always appreciated :
you can also help others by marking 'accept as solution'

Heat sensors

Does anyone know if mac pro has heat sensors for the cpu or hard drives?
G4 Dual 1.25, mac pro 3.66 Mac OS X (10.4.7)

Wow I was expecting hot temps such as 60-80C just
like the MB and MBP
thanks i'm gonna test one today and see if i want
one
Hi Graeme43,
Today t° is higher:
http://peloche.smugmug.com/photos/93434559-L.jpg
Peloche

Proximity sensor--will Apple replace?

I am having some issues with the sensor, if I take it into the genius bar and tell them that I'm having an issue with it, will they replace my phone? it is getting annoying

germanwarfare wrote:
Please wait for the next update 4.1 which will relieve the issue you are having with the proximity sensor. Try to ignore the gloom and doom comments as they are typically from trolls and those looking to get a reaction. The problem has been resolved, just stand by for the update.
I'd surmise that you purposefully choose the word relieve rather than fix
Care to enlighten us further?

Viewing the status of moisture sensors, temperature and other data

Is there a program which reports the status of temperature, moisture and other sensors as well? The applications I've tried do not include moisture sensor information.

The Apple Hardware Test will check the status of various internal sensors but not the moisture detectors.
Ciao.

My iphone 5S finger print touch sensor got damaged , replacement of touch sensor will work touch id ?

a local service person damaged my iphone 5s touch sensor while replacing the strip , after that only home button is working , finger print sensor is not working , only passcode option in settings, no touch id n passcode ... replacement of touch sensor will work the touch id ?? plz guide me

It was in warranty (one year) until it was opened.
If it is working (other than fingerprint reading), the safest thing is to just use it with a passcode. It is still better than any other model iPhone.
If you are feeling lucky, you could take it back to your service person. Maybe the cable from the home button isn't connected properly, and can be fixed. There is, however, the risk of more damage, so you can end up with no working phone.
If there is a real Apple store available, they may accept it for a non-warranty replacement. It would be cheaper than a new phone, but a lot of money for just getting fingerprint reading.

PCH sensor temperature

I use iStats Menu for temperature monitoring, and two days ago, when i wake up my MacBook Pro Retina 15", istats initially reports CPU and PCH die temperature of 129 º Celsius, although CPU and PCH proximity censors are in the 45 º C vicinity. CPU usage is around 1 %. Should i be worried or is it just a glitch in initialization of istats from sleep?
Thanks in advance
JCK

Welcome to the Apple Support Communities
First of all, check that the temperature that iStat Menus shows isn't in Fahrenheit. 129ºF are 53ºC, a normal temperature (maybe a bit high, but nothing to worry about).
If they are in Celsius, I would think that sensors may be damaged, more if you feel that your fans are working.
I recommend you to run Apple Hardware Test and make an extended test. To start Apple Hardware Test, hold Option and D keys while your computer is starting. When it finishes, if you see an error, copy it here, but it will probably indicate that the sensor is damaged

Heat Tape Temperature Ramping

Hello everyone,
Recently, I've been able to use LabVIEW with a digital output module to switch a relay to turn on a heat tape. Basically, if a thermocouple reading is less than the set temperature of the heat tape, the digital output sends a signal therefore switching a relay allowing the output circuit with the heat tape to complete and therefore power the heat tape.
Though my program has been working fine, I have been wanting to add some sort of temperature ramping capability. That is, I would like to be able to control how fast I am heating my apparatus. Because the heat tape is either on or off (no in between temperature settings), my plan is to calculate the current rate of how fast the apparatus is heating, compare this rate to the set rate that I wish to heat at (example 5 degrees Celsius/min), and then use this comparison to control the rate at which the heat tape is turning on and off.
Anyone have any thoughts on my p or ideas on how I should try to implement such a feature?
Justin

A PID controller connected to a PWM to cycle power to the heater is definitely the way to go. You could control the heating rate directly - use the measured rate as the process variable and the desired ramp rate as the setpoint - or you could ramp the actual temperature setpoint. The former might get you a more even heating rate, but the latter will get you better temperature control at the final temperature, and it's not that much work to ramp the setpoint. For a slow heating system, you can generate a PWM signal in software. Here's an example of a PID controller connected to a square wave generator to get a PWM signal:
You can simplify this slightly by removing the "Tick Count" initial time outside the loop, and the subtraction; connect the timer output directly to the division. It will work the same.

Heat Sensor Temperature chip replacement

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