I've had a HP DV6-1340SS laptop for about 3 years. Some months ago, I started hearing some kind of unusually loud fan noise with no apparent relation to CPU load. It's not the usual air sound, it probably sounds more like a helicopter, and appears randomly: I can use the PC for a whole day without noise, but it could be terribly noisy the following day.
I have tried replacing the whole fan structure with a unit I ordered on eBay, with no luck. Just as noisy. In the following video, you can hear the noise (once I replaced the fan). The laptop is completely disassembled, it's just the motherboard (including fan).
I have also tried using my old fan with the new heatsink, and my old heatsink with the new fan, cleaning them internally... I have tried touching every part that could vibrate, but I haven't been able to find the noise source. The only clue I have is that the noise seems to stop when I lean the motherboard so that it's perpendicular to the floor.
There you have a couple of photos:
So my questions are:
- Should the fan or heatsink be assembled in any special way? I mean: should the screws be screwed the whole way?
- Could the new fan be also faulty? Isn't it too much of a coincidence?
- Is there any other part that could be vibrating?
Thank you very much for your help.