CPU runs hot, fan always on even after cleaning heat sink

I have an HP laptop dv9000 with 2 GHz Intel Core 2 processor. I run Speedfan to monitor temps. I noticed that the CPU was suddenly running about 10 degrees C hotter than usual: at 0% CPU usage, temp would get into the 40's, whereas before it would run about 30.

I took apart the computer and cleaned the dirt out of the heat sink.

Now, as soon as I turn on the computer, the fan comes on and runs at a steady high RPM all the time, loud and annoying. And CPU temp is still high, running about 38 degrees at idle when I would expect it to be 29-30.

Is there something wrong with the temp sensor--and if so, where is it? Is it repairable without replacing the motherboard?
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  1. Laptops are notoriously difficult to work on and fix. Just telling you that now.

    I can't tell you exactly where the problem is, but I can tell you it is probably not the temp sensor.

    Your best bet might just be to take it to a repair shop.
  2. Yeah, well, paying someone else to fix it isn't really an option.

    I replaced the motherboard in this laptop about 2.5 years ago, so I know how to work on it... I just need some idea of what to look for in order to troubleshoot this problem.
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