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OT: computer cooling

S

Slowpoke

Well-known Member
I have a HP ZV6000 laptop with 2 fans. I discovered the CPU fan stopped working & caused the computer to shut down. The CPU fan failed a 4.5v dc run test (maybe there wasn't a good connection, due to the tiny size of the wires and connector).
I replaced the fan with a tested good unit. On startup, both fans run about 2 seconds then stop. After another 2 seconds only the secondary fan starts and continues to run.
I asked a computer tech if software controlled the fans. He said "No". Of course he may not consider the bios as software. Is he correct?
Any help appreciated.
Thanks
 
(quoted from post at 19:25:15 01/04/15) I have a HP ZV6000 laptop with 2 fans. I discovered the CPU fan stopped working & caused the computer to shut down. The CPU fan failed a 4.5v dc run test (maybe there wasn't a good connection, due to the tiny size of the wires and connector).
I replaced the fan with a tested good unit. On startup, both fans run about 2 seconds then stop. After another 2 seconds only the secondary fan starts and continues to run.
I asked a computer tech if software controlled the fans. He said "No". Of course he may not consider the bios as software. Is he correct?
Any help appreciated.
Thanks
Click to expand...
or battery power conservation purposes, you can bet that one or both fans have some kind of control, either software, firmware, or just a simple thermal switch.
 
The BIOS controls fan speed, although once the operating system boots it may manipulate the hardware to minimize power consumption.

Two seconds into the bootstrap the operating system hasn't yet taken control, so the behavior you see is at the hardware and BIOS level. The BIOS will fire up the fans briefly to make sure they're working, then turn them off if they're not needed. The BIOS monitors the actual fan speed. If you go into your BIOS settings, you should see the temperature and fan speed measurements. You can probably adjust the settings so the fans turn on at a lower temperature if you like.
 
MarkB-MI, Thanks for the reply,

I was testing the fans at about 60F on battery alone, so maybe the CPU fan comes on later. When the problem first occurred I came into 72F from about 45F and a short time later on AC power the computer screen went out. Maybe that's when the original fan failed. So I'll let the computer run for a while and see if the fan comes on. While I had things apart, I cleaned the old deteriorated heat paste off the CPU and put on a new coat.
 
slowpoke- Are you sure that you are reporting in degree F instead if Degree C?

If in Degree F...that is some good operating temps.
 
(quoted from post at 23:16:18 01/04/15) slowpoke- Are you sure that you are reporting in degree F instead if Degree C?

If in Degree F...that is some good operating temps.
Click to expand...
on the other hand think he would have been in a world of hurt at 72C (161F)!!!! :roll:
 
The behavior describe is consistent with my laptop. The fan will come on briefly on power-up, then shuts it off. If the laptop has been in my car overnight at subzero temperatures, the fan seems to stay on a bit longer, presumably to bring the components up to normal operating temperature.

When you're on battery power, the operating system will throttle the CPU speed to reduce power consumption. This in turn reduces the need to operate the fan. If you want to get it hot, plug your laptop into the wall and give it something to do. You can probably find a "benchmark" program on line that will give the CPU and GPU a workout. Google "graphics benchmark".
 
MarkB-MI,

The replacement fan works intermittently, so I guess it's normal. Time will tell!
 
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