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LCD Replaced now Fans work harder

L

likegadgets

macrumors 6502a
Original poster
I have a late 2008 MBP 15" Unibody. The LCD developed some noticeable dust under the glass and an authorized Apple service center replaced the LCD (the part replaced was the complete aluminum cover including the LCD).

It works just fine - but noticed that the FANs run at the higher RPMs more often and noticeable longer than before.

I am wondering if some kind of sensors was not placed properly at the replacement or what else can be going on.

Any thoughts?
 
Eidorian said:
Have you reset the SMC?
Click to expand...

Ah yes, I forgot to mention I did reset the SMC. I did follow the instructions of shutting down, removing the battery and magSafe, held power for 5 secs , reconnected and restarted.

Thanks for pointing this out.
 
My experience is that if any sensors are defective or giving incorrect readings the Mac goes into fail-safe mode and the fans run at full speed all the time.

So I doubt that that is the problem.

You could run Hardware Test, that will highlight any failed sensors.
 
Thinking about this some more... an LCD replacement on the Unibodies is major surgery. You basically rip the all the guts out to get to the hinge.... logic board, drive, battery, fan, heatsink. Everything. Check out the iFixit guides to see what Apple did.

So the problem need not be directly related to the LCD. Possibly Apple put something back wrong - something internal might be blocking the fan, or the heat flow from the CPU to the fans.

When it's been working flat out (2x100% CPU load) for say 10 minutes, what are the CPU, heatsink, enclosure temperatures & fan speeds?
 
Pax said:
Thinking about this some more... an LCD replacement on the Unibodies is major surgery. You basically rip the all the guts out to get to the hinge.... logic board, drive, battery, fan, heatsink. Everything. Check out the iFixit guides to see what Apple did.

So the problem need not be directly related to the LCD. Possibly Apple put something back wrong - something internal might be blocking the fan, or the heat flow from the CPU to the fans.

When it's been working flat out (2x100% CPU load) for say 10 minutes, what are the CPU, heatsink, enclosure temperatures & fan speeds?
Click to expand...

I disassembled the back cover - and the vents looked clear, but I noticed excessive dust. I used clean compressed air to clean and so far the machine now appears to be working normally. Everything looked in place. I will monitor for the next few days and see if it acts up again.

Thanks for the suggestion
 
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