Repairing Macbook Overheating Issues??

Discussion in 'MacBook' started by L-Stance, Apr 26, 2012.

  1. L-Stance macrumors newbie

    Apr 16, 2012
    I have a 2.16 Ghz Core 2 Duo white macbook i bought a few years ago. Recently its been having some pretty bad overheating issues with random shutdowns or the notice window popping up telling me to hold the power button down.

    I've been seing CPU temperatures of over 85 degrees Celsius and Heat-sink temps of 60+ on IstatPro! :eek: Im guessing the random shutdowns are due to overheating which could be a combination of dust and the old fan/heat-sink.:(

    Im taking it in to get repaired but I was wondering if i should buy the replacement parts myself instead of letting them install whatever they like. Are there better fans/heat-sinks than others for my macbook?

    Also is it necessary to replace the heat-sink and or the thermal paste as well?

    BTW im taking it to my university repair shop not the apple store for repairs.

  2. GGJstudios macrumors Westmere


    May 16, 2008
    If your temps are maxing out at 85 or 90C, your Mac is not overheating. The Intel processors used in Macs are designed to automatically shut down to prevent damage if they truly overheat. CPU Tjmax = 105C, GPU Tjmax = 100C on i3, i5, i7 processors. (Source: Intel) If you're not already using it, iStat Pro will give you accurate readings of your temps and fan speeds, among other things.

    Unless there is a rare defect in a Mac, most temps are well within the normal operating range, considering the workload being put on it. Websites with Flash content, games and other multimedia apps will put higher demand on the CPU/GPU, generating more heat. This is normal. If you're constantly putting high demands on your system, such as gaming or other multimedia tasks, expect temps to rise and fans to spin up accordingly. It's just your Mac doing its job to maintain temps within the normal range.

    It is also quite normal for your Mac to become extremely hot to the touch during intensive operations. The aluminum body transfers heat more effectively than other materials used in computer casings, so you will feel the heat more. This doesn't indicate that it's overheating and will not harm the computer to be hot to the touch.

    Your fans are always on when your Mac is on, spinning at a minimum of 2000 rpm (for MBPs) or 1800 rpm (for MBAs, MBs and minis). iMacs have 3 fans with minimum speeds in the 800-1200 range. They will spin faster as needed to keep temps at a safe level. If they're spinning up without increased heat, try resetting the SMC. (PRAM/NVRAM has nothing to do with these issues, so resetting it will not help.)

    The intake and exhaust vents are in the back of the computer near the hinge on all Mac notebooks. The iMac vent is a slot on the back near the top of the computer. Make sure the vents remain unblocked to allow your computer to perform at its best.

    Learn about the fans in your Mac
    Apple Portables: Operating temperature

    For Flash-related issues:
  3. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    Ok if its not a case of overheating what do you think is causing the shut downs? Im pretty sure the pop up screen said something about a kernal which I thought was what prevents my laptop overheating. Theres also been times when the laptop just cuts out power and turns off, I thought this was a failsafe mechanism when overheating occurs.

    Any ideas what i should look into getting fixed?
  4. GGJstudios macrumors Westmere


    May 16, 2008
    Launch Activity Monitor and change "My Processes" at the top to "All Processes", then click on the CPU column heading once or twice, so the arrow points downward (highest values on top). Also, click on the System Memory tab at the bottom. Then take a screen shot, scroll down to see the rest of the list, take another screen shot and post them.
    The kernel is part of your Mac operating system. What pop-up screen? Did it look like this?:
    If so, that's called a kernel panic. If it doesn't happen again, or very infrequently, don't worry about it.
    "You need to restart your computer" (kernel panic) message appears (Mac OS X v10.5, 10.6)
    Mac OS X 10.7 Help: If “You need to restart your computer” appears
    Mac OS X: How to log a kernel panic
    Understanding and Debugging Kernel Panics
    Resolving Kernel Panics
    There is such a protection against overheating, but it won't shut down until CPU temps reach 105C, which it doesn't sound like yours is reaching. You may need to just track iStat Pro closely to see what temps are at the time of shutdown.
  5. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    Thanks I really appreciate the help, regarding the kernal panics after some reading I've started to suspect they may be due to a USB memory stick I've been using. I think I've had it plugged in every time I've had the error screen you posted.

    But I think the second problem of random power failures may be as you described about overheating, I have noticed the power cuts have occurred after prolonged use when the laptop is hot and the fan is going full pelt. Im going to check the control app system log for 'temperature exceeding max' type lines next time I get a power cut. I only checked the temperature after moderate use yesterday which was 85 degrees but I would not be surprised if temperatures after prolonged use were reaching 105.

    I will upload screenshots soon, I was going to wait till the laptop gets as hot as it usually does after prolonged use.

    Thanks again for taking the time to help me out
  6. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    Is it safe to copy and paste information from my console system log online?
    I think I found the point in the timeline where the last power failure happened i was wondering if it was possible for someone to work out the problem from it?
  7. GGJstudios macrumors Westmere


    May 16, 2008
    Sure it's safe.
  8. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    Ok great, I just did a SMC reset on my laptop because some people were recommending it online...

    I cant seem to be able to look back in the system log to yesterday so I cant find the time of the power cut, is there a way of going further back in system log or is it only the last day?
  9. GGJstudios macrumors Westmere


    May 16, 2008
    Resetting the SMC will help with some issues, such as your fans spinning up when there is no increase in temperatures. Resetting it won't help if you have an app or process that is consuming system resources and thereby generating increased temps.
    It should go back farther than a day. If it doesn't, it sounds like the log has been cleared. You'll just have to check it right after you experience the next shutdown.
  10. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    I've got this from the system diagnostic report for the times of the kernel panic....

    Thu Apr 26 01:51:02 2012
    Panic(CPU 0): Unresponsive processor, TLB state:0
    EAX: 0x00000000, EBX: 0x00000010, ECX: 0x0010bda8, EDX: 0x35b83024
    CR2: 0x1c0de008, EBP: 0x0010bec8, ESI: 0x00000000, EDI: 0x00000010
    EFL: 0x00000046, EIP: 0x00cf1aa7, CS: 0x00000008, DS: 0x069a0010
    Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
    0x10bd58 : 0x2b32c3 (0x10be00 0x0 0x10bd88 0x2ace73)
    0x10bd88 : 0x2ab423 (0x2 0x10be00 0x10bde8 0x2240ba)
    0x10bde8 : 0x2a1da5 (0x10be00 0x8196ae80 0x10be48 0x231c92)
    0x10bec8 : 0x556636 (0x4f02000 0x5bfb680 0x10bf28 0x298d4a)
    0x10bef8 : 0x954053 (0x5bfb680 0x0 0x4cfc500 0x1)
    0x10bf18 : 0xb92213 (0x4d5b700 0x0 0x0 0x90)
    0x10bf38 : 0xb9d911 (0x90 0x0 0x10bf78 0x0)
    0x10bf58 : 0x580d96 (0x4cab400 0x0 0x4cab500 0x90)
    0x10bf78 : 0x2ab432 (0x90 0x4756bef0 0xd0 0x1)
    0x10bfd8 : 0x2a1c2e (0x4756bef0 0x0 0x0 0x2a2a5b)
    0x4756bf88 : 0x227cd4 (0x1 0x690d3d4 0xffe008a0 0x7fff)
    0x4756bfc8 : 0x2a4098 (0x69a3000 0x1 0x10 0x53bf184)
    Kernel Extensions in backtrace (with dependencies):>0xbd2fff
    Kernel Extensions in backtrace (with dependencies):>0xcfbfff

    BSD process name corresponding to current thread: Google Chrome He

    Mac OS version:

    Kernel version:
    Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
    System model name: MacBook2,1 (Mac-F4208CAA)

    System uptime in nanoseconds: 6345838293388
    unloaded kexts: 2.0 (addr 0xcc0000, size 0x12288) - last unloaded 130428550434
    loaded kexts:
    xxx.qnation.PeerGuardian 1.1.9
    at.obdev.nke.LittleSnitch 2.2.05 1.6.3 - last loaded 4741813820246 2.1.0 2.0.5f14 3.5.7 1.0.20 6.3.6 6.3.6 3.0.1d2 1.57 425.14.7 7.0.0 1.1.6 19 4.7.0a1 1.5.1 170.0.46 303.8 201.6 201.6 201.6 2.6.8 160.0.0 1.6.4 4.7.3 4.2.4 31.1 1.0.0d1 3.2.1b1 2.1.7 2.5.1 4.2.4 4.2.0 1.4.0 1.3.1 1.5 1.3.6 1.7 1.3.6 1.4 142.6.0 1 0 2.1.14 142.6.0 2.6.8 2.6.7 17 10 14 10 10 20 2.0.5f14 2.0.3 320.1 74.2 2.4.5f3 10.0.3 1.8.3fc2 1.3 2.0.5f14 2.0.5f14 41 3.1.0d5 4.7.0a1 1.0.1 2.2.1 2.2.1 2.4.5f3 2.4.5f3 2.4.5f3 4.2.4 4.2.0 3.9.0 2.6.8 1.6 1.6 1.6.1 402.1 2.5.1 2.6.8 4.2.6 4.2.4 1.10 2.0.6 2.5.1 4.2.4 1.4.0 1.6.6 1.1 1.0.0d1 6 289 1.6.3 1.3.6 2.6.5 1.3.0
    panic(cpu 1 caller 0x28fc2e): "TLB invalidation IPI timeout: " "CPU(s) failed to respond to interrupts, unresponsive CPU bitmap: 0x1, NMIPI acks: orig: 0x0, now: 0x1"@/SourceCache/xnu/xnu-1504.15.3/osfmk/i386/pmap.c:3572
    Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
    0x4757b9d8 : 0x21b837 (0x5dd7fc 0x4757ba0c 0x223ce1 0x0)
    0x4757ba28 : 0x28fc2e (0x59a47c 0x1 0x0 0x1)
    0x4757ba98 : 0x292e96 (0x4b2f7b4 0x1d098000 0x0 0x1)
    0x4757bb48 : 0x26fcf0 (0x6b81d 0x5 0x4757bbf8 0x235975)
    0x4757bbb8 : 0x270316 (0x7503848 0x0 0x0 0x1073000)
    0x4757bc18 : 0x2626fb (0x7503848 0x0 0x0 0x1073000)
    0x4757bd08 : 0x283696 (0x685d47c 0x1a557000 0x0 0x1073000)
    0x4757bd88 : 0x284847 (0x685d47c 0x1a557000 0x0 0x1073000)
    0x4757bdb8 : 0x24eff4 (0x685d47c 0x1a557000 0x1073000 0x1c63d000)
    0x4757bdf8 : 0x21dbe5 (0x53dd890 0x67b2c98 0x1fbd0c 0x907)
    0x4757be38 : 0x210a86 (0x53dd800 0x0 0x7a7fea0 0x5fe57e0)
    0x4757be98 : 0x216f84 (0x53dd800 0x0 0x0 0x0)
    0x4757bf18 : 0x295914 (0x4757bf44 0x0 0x0 0x0)
    0x4757bfc8 : 0x2a20f8 (0x6a12ee0 0x0 0x10 0x53bf184)

    BSD process name corresponding to current thread: Google Chrome He

    Not sure if thats any use, theres a second one for when I rebooted and it happened again but after that I just left it off. Let me know if i should post the other one or if its no use anyway.
  11. GGJstudios macrumors Westmere


    May 16, 2008
    It appears it may be related to Google Chrome. Have you tried running with another browser, such as Safari?
  12. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    Not really I mainly use chrome, a quick search in google showed that chrome seems to be causing a lot of people kernel panic notices. Thanks for pointing it out to me I'll give a different browser a go. Thats a shame though I really liked chrome :rolleyes:.

    So if thats the issue with the kernel could the random system power failures be due to chrome too? I last had it while using microsoft word though chrome was probably also open in the background. The other time I had it i was watching tv on on chrome, is this just a coincidence or could chrome be causing the power cut issue also?
  13. GGJstudios macrumors Westmere


    May 16, 2008
    The one way to find out is to stop using Chrome and see if the shut downs still occur. Basic troubleshooting involves a process of elimination, until the source of the problem is found. Dropping Chrome out of the equation is a quick way to find out for sure.
  14. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    Thanks so much mate, you've very likely saved me £60 minimum in assessment fees and repair. Will getting my computer cleaned for dust etc, reduce fan noise or is running at temperatures of 80 degrees normal and the fan will inevitably be this loud?
  15. GGJstudios macrumors Westmere


    May 16, 2008
    Whether 80C is normal completely depends on the workload you're running. If your temps are legitimately at 80C because of workload, it's likely your fans will be louder. As for cleaning, I recently opened my MBP and found almost no dust accumulated after 4 years of use and travel. Unless you're working in a dust storm, it's very unlikely that enough dust has accumulated to cause problems.
  16. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    thats great man your a lifesaver thanks so much, I'll repost if i have another power cut or kernel panic but hopefully switching browser will sort it. I would never have thought it was as simple as the browser I was using haha
  17. GGJstudios macrumors Westmere


    May 16, 2008
    Good luck with it! Hopefully, that's all it is. By the way, are you sure you're using the most current version of Chrome? If you're using an older version, it's possible there were bugs fixed by a release you haven't installed yet. Just a thought.
  18. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    Pretty sure chrome updates automatically but Im not 100% sure, tbh if its caused any system crashes thats too many and ill just switch to safari. Thanks man
  19. L-Stance thread starter macrumors newbie

    Apr 16, 2012
    Hey CGJ I had another slight problem last night watching tv. I was streaming tv on safari this time and the audio started crackling and getting very distorted. This was the same if i plugged headphones in or if i used the internal speakers. I forgot to mention this in the previous posts but i have experienced this before. The only way i could work out how to stop it was to close the laptop leave it for 5 or so seconds until i heard the fan spin down then open it up again and the audio was back to normal. Do you think this is down to flash player?
  20. GGJstudios macrumors Westmere


    May 16, 2008
    For troubleshooting any problem, try to eliminate possibilities. In this case, try streaming the same content with another browser, to see if the problem is Safari-specific. If you get the same crackling on another browser, it may be the content itself that is corrupted. Make sure your Flash player is up to date, using the links in the 2nd post of this thread.
  21. yojitani macrumors 68000


    Apr 28, 2005
    An octopus's garden
    One major culprit of older machines starting to overheat is dust. I've recently revitalized three computers (an iMac and two macbooks) by simply cleaning the fan vents (from inside the computer). My method is probably terrible: I take out the fan and vacuum the dust-caked vents (with the iMac) or I use a long narrow spudger and gently scrape out the dust. The difference in performance is immediate (after reassembly of course!).

    Also, you might check the thermal paste.
  22. Stuwkowalski macrumors newbie

    Jan 8, 2013
    2007 white MacBook overheating.

    Hey guys! so glad I found the thread. I have a white 2.0ghz MacBook that I bought new in '07, and for the past year, almost 2, it's been getting really hot, sometimes 98+ Celsius. I too get that kernel panic screen where my computer freezes and tells me to hold the power button down to shut the machine off. I only ever have the mag safe power plugged in, and my usb corded mouse plugged in and that is all. My MacBook has been my secondary computer for almost the whole time I've had it, so I mainly just watch YouTube, and have Twitter open. I am wanting to sell it soon, and it worries me that it might have a defect. Do you have any more input on what may be going on? maybe my problem is different? All the help is much appreciated! :)
  23. Brian Y macrumors 68040

    Oct 21, 2012
    Probably overheating (if the processor shuts down, you will get a kernel panic for an unresponsive CPU).

    You can clear out the fans with a can of compressed air (you'll need to open it), and if you're really handy with a screwdriver, a new application of thermal paste won't go a miss (but on a 2007 it does mean taking out the MLB - but you should do that to clean it properly anyway!).

    If you want confirmation of exactly what's causing it, you'll need to post the panic log from Console, like the op did.
  24. Zotaccian, Dec 9, 2013
    Last edited: Dec 9, 2013

    Zotaccian macrumors 6502a


    Apr 25, 2012
    These Macbooks are designed with only minimal cooling system which is capable of cooling the system only in ideal conditions when there is high cpu load. When using my 2.16GHz machine on table and browsing the internet, fans will eventually end up running pretty loud, much louder than my FSC Esprimo, flash is a certain thing to make fans spin max. Just couple minutes ago my 2006 Macbook did shutdown because I used it in non-ideal soft surface and tried to watch hd quality flash video. My Toshiba and Esprimo can both handle same conditions much better and they both use cpus made around the same time as Macbook. Both of these machines look like crap compared to Macbook but they work.

    No, it's not dust, Macbooks from 2006 and 2007 just run hot. Combine that with topcase cracking on various other issues, I think these are very flawed computers with some nice features, like good touchpad and nice looks...
  25. endlightend macrumors member

    Nov 5, 2013
    This thread was dead for 11 months until you revived it...

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