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February 9th, 2010 17:00
CPU temperature
Hi!
My laptop is getting wery hot lately, last night it automatically shutdown it self. When i starteded it came with a message saying that the computer owerheated. For that reason I installed a program to read the temperature. It's showing 60C at startup, then when working it rises up to 100C, then I shutdown the computer to cool down. The reading of the CPU temperature as I write right now is 90C with just IE and media player running.
So I would be very thankful if someone can tell me the working temperature range of my CPU (intel core 2 CPU T5500 @1.66GHz 1.67GHz) and if this temperatures are alarming, and will cleaning the coolers save my computer? The most heat is coming from the top left side of my Dell Latitude D620.
Thank you in advance! :)
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ejn63
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February 9th, 2010 19:00
Check the heatsink assembly for signs of dust accumulation -- even a thin layer will prevent it from doing its job. Also make sure the fan is operating correctly (Dell diagnostics, F12 at powerup).
oke1
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May 5th, 2011 04:00
Similar heat problem with 4 years old D620, T2300E @ 1.66GHz and integrated video. Note that there are many posts on this topic in this forum. If EJN63's advise does not apply to your system, you might have to go a step further as I had to do.
I had to disassembly my system (see for instructions for instance http://ahwee.com/how-to-disassemble-laptop-dell-latitude-d620) and found that everything arround the fan and heatsink was very clean. Fan is operating normally as it should and is going in steps to max when CPU temp is at about 900C (measured with Core Temp). However, the air blown out at left top is not really warm or hot. CPU doing nothing at all already gives a 550C. Starting an application that gives about 50% CPU load raises temperature to 950C-1000C (1000C is max for this CPU according to Intel) and the CPU starts throttling frequency to lower dissipation (to protect itself from disaster). Removed carefully the heatsink to exchange the pad, which had been detoriated over time (dried out). Cleaned heatsing and CPU thorowly and carefully and put thin layer of AS5 on both CPU and heatsink but that did not help much. Checked heatsink warming up in running system and indeed it gets very hot at and arround the CPU. This brings me to the conclusion that although CPU heat is conveyed to the heatsink properly, the heatpipe in the heatsink is malfunctioning most likely and hence heat is not transported to the vent outlet.
Ordered new heatsink via ebay and hope replacing heatsink solves this nasty problem.
The heatsink's heatpipe was indeed the cause of the heat problem. After replacement warm to hot air is blown out of the left top, idling temp is 350C, and temp at stress (constant 100% CPU load on both cores) is on average 620C (at 250C environmental temp). The replacement heatsink is a KN982, which is used in the D630 but compatible with D620 (the original is a YD410).