sapzolls

Q: MBP 17-in ramdom shutdown. GPU heatsink 30-128 degree Celsius

Hi All

 

I have a very old great condition Macbook Pro 17-inch (MacbookPro2,1 2.33GHz) which was not used for about 3-4 years because of bad LCD. It was in a drawer, hidden for long time.

 

I recently fixed the LCD and it works fine except a problem "Random Shutdown"

 

For checking overheating problem or not, I installed iStat Menu program to see different temperatures and found GPU heatsink temp is 128 degree Celcius

(Approx 262 degree F). I observed that sometimes it comes down from 128 -> 40 -> 30 -> 1 and then shoots up to 128 back making flu 6000 RPM on the Fan

 

If my FAN is max from beginning, the Random shutdowns are much less.

 

I recently upgraded memory to 4GB and ran memtest program for testing. It was a very heavy load testing, and the MBP was perfectly fine.

 

Another problem is, when the MBP is shutdown normally/random , next power-on does not happen with or without main power plugged in … if I press power button for 5 seconds , then it starts without any problems.

 

Is this normal ? what could be the reason? Check the pics

 

IMG_4016.JPG

Posted on Nov 7, 2015 1:45 PM

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Q: MBP 17-in ramdom shutdown. GPU heatsink 30-128 degree Celsius

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  • by sapzolls,

    sapzolls sapzolls Nov 7, 2015 4:56 PM in response to kaz-k
    Level 1 (9 points)
    Nov 7, 2015 4:56 PM in response to kaz-k

    I removed the logic board and found that the sensor was properly seated on the heatsink as well connected to the board.

     

    See below pics. Looks like the Arctic Silver compound looks too much when it was applied last time a few years ago .. It may have to be adjusted.

     

    The question is, if the sensor is bad, how does it trigger shutdown of the MBP ?

     

    Would it help if the Arctic silver cleaned up and reapplied in appropriate quantity ?

     

    Anything odd in the pics ?

     

    IMG_4034.JPG

    IMG_4033.JPG

  • by sapzolls,

    sapzolls sapzolls Nov 7, 2015 6:52 PM in response to OGELTHORPE
    Level 1 (9 points)
    Nov 7, 2015 6:52 PM in response to OGELTHORPE

    Hi Olegthorpe,

     

    I cleaned up all the thermal paste and reapplied new one and assembled the MBP.

     

    Now all the issues seem to be gone. The GPU heatsink temperature is normal range. AHT does not show any more errors.

     

    I appreciate all your inputs that helped me get going.

     

    See the snaps.

     

    IMG_4037.JPG

     

    IMG_4038.JPG

     

    IMG_4039.JPG

  • by Grant Bennet-Alder,

    Grant Bennet-Alder Grant Bennet-Alder Nov 7, 2015 7:12 PM in response to sapzolls
    Level 9 (61,078 points)
    Desktops
    Nov 7, 2015 7:12 PM in response to sapzolls

    The question is, if the sensor is bad, how does it trigger shutdown of the MBP ?

    The sensor is read by the System Management Controller (SMC). SMC firmware decides when things are getting hot, and boosts the fan speeds, or getting out of hand and it needs to shut everything down.

  • by Lanny,

    Lanny Lanny Nov 7, 2015 8:04 PM in response to sapzolls
    Level 5 (7,979 points)
    Desktops
    Nov 7, 2015 8:04 PM in response to sapzolls

    In the future, you can use screen shots instead of using a camera to take pictures of your screen: https://support.apple.com/en-us/HT201361

  • by OGELTHORPE,

    OGELTHORPE OGELTHORPE Nov 8, 2015 3:21 AM in response to sapzolls
    Level 9 (52,511 points)
    Mac OS X
    Nov 8, 2015 3:21 AM in response to sapzolls

    Let me make a couple of points.  An error free AHT is not a 'clean bill of health'.

     

    Second, based on the last set of temperature readings that you posted, the fan speeds should be at the default values, not in the 4k rpm range.

     

    See if a SMC reset corrects it:

     

    https://support.apple.com/en-us/HT201295

     

    Ciao.

  • by sapzolls,

    sapzolls sapzolls Nov 8, 2015 3:31 AM in response to OGELTHORPE
    Level 1 (9 points)
    Nov 8, 2015 3:31 AM in response to OGELTHORPE

    Thanks. The FAN speed of 4000 was because I had smcFanControl running at default set when the heat problem was happening. It is back to normal now.

     

    Also, I have been using the MBP for 5-6 hrs with few youtube tabs in Chrome, apple keynote in Safari.. and temperatures kind of keeps around 75-80 celsius on  high load.

     

    I will check out the SMC reset as well just in case.

  • by OGELTHORPE,

    OGELTHORPE OGELTHORPE Nov 8, 2015 3:48 AM in response to sapzolls
    Level 9 (52,511 points)
    Mac OS X
    Nov 8, 2015 3:48 AM in response to sapzolls

    sapzolls wrote:

     

    Thanks. The FAN speed of 4000 was because I had smcFanControl running at default set when the heat problem was happening. It is back to normal now.

     

    That accounts for the higher rpms.  My observations are that when the temperatures start getting 60°c+, then the fans start increasing speed.

     

    Ciao.

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