Dell D620 GPU\MB Overheating issue
It seems that this is a common issue with D620 and might have to do with the fact that they use thermal pads (not paste) to interface the heat transfer from CPU to heatsink.
Even at the moment, my D620 cores are 70 and 71 degrees Celsius, and all I'm doing is typing in this forum. The air circulating in/out of the vents is cool and the fans are clean. I've had this laptop appart myself to install WWAN and BT cards, and inspected the fans then (2 months ago). This tells me that the high temp readings are because the chip is hot but the heat is not being transferred to the heatsink. So I think it must be that the thermal pad (crappy shortcut idea by Dell) is rotten.
Check these links...
Disassembly: AhWee.com - How To Disassemble Laptop (Dell Latitude D620) › How To
High Temps and paste: Dell Latitude CPU temperature - AppleNova Forums (yes, an apple forum but some brave soul posted about his D620)
I'm going to follow the disassembly guide myself and scrape/clean off the old pad/paste/whatevertheheck and re-apply some good quality paste.
I'll hopefully post the results back here...
|they use thermal pads (not paste) to interface the heat transfer from CPU to heatsink|
On your D620, does the fan throttle up and down... If it doesn't the issue lies elsewhere...
The Dell D620 suffers from a few issues of temperature control. Since it suctions air from the bottom of the laptop, the fan blows all kinds of dust into a the heatsink of the unit. It isn't unusual to find a thick wad of dust on the inlet of this heatsink. The only way to deal with this effectively is to disasemble the laptop. Check the fan operation; sometimes the fan power supply fails (not the fan) this will cause the laptop to shutdown or not to boot at all. While you have the unit disasembled, change the blue heat pads for thermal paste. Once you change the pads you have to mind how you tighten the heatsink again; use a cross pattern to tighten them.