Fan will not go at full speed on ProBook s 4720

I have a notebook ProBook 4720 s, Windows 7 64 bit

The problem is that the fan on my computer always remains at minimum speed and the computer warms, the fan does not accelerate to full speed. The computer is really hot ~ 70 ° C. The problem occurred when I updated the bios to its latest F.20. I think that there is a bug with this bios - that the bios will not control the fan properly. This type of laptop has a history of bugs in the bios: the original bios does the fan run all the time at full speed which has been resolved with a bios upgrade.

This bios came with a note that I can not downgrade to an earlier version which worked well. So my question is, can I expect an upgrade of the bios for this computer that could correct the error.

to: Earhart-jir

There is a temporary workaround solution. only do so at YOUR OWN RISK.

This procedure works only on the ProBook s 4720 bios F.20. DO NOT TRY THIS METHOD ON OTHER MODELS!

It only works when the laptop is on AC POWER. Download 'read and write utilities' http://rweverything.phpnet.us/. run the program, then click the icon of the EC (embedded controller). in the on-board controller window that opens, you will see a matrix of 16 x 16 = 256 numbers that choose the "05" version in the column and row "D0". This number has an offset address 213 (in dec) and probably a value of 1.

(If you do not find it do not attempt to change a number at random, sound risky)

Change the value to something from 0 to 70 (don't exceed 7F) and the fan will speed up the desired value.

also, don't change the other values - risk of damaging the material

the procedure must be repeated every time you start

This procedure works only on the ProBook s 4720 bios F.20. on other models, the offset is different so don't try not not this method!

do it at your own risk only

the heart of the problem probably lies in the bad DSDT table (which came with the bios), but I guess that you would need an expert to fix it.

If you need more information, you can leave a message

Tags: Notebooks

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