HP 6735s Fan & heat problem.

[taylor9610]

I am having the same problem with my laptop and the fan. The battery went out right before my warranty. Not sure if that has anything to do with the fan. I use battery more than power supply. Hp gave me a hard time about replacing my battery. They were telling me my warranty was up. I had to go through a lot to prove to them that it wasn't,  They did not address the fan problem. I am also having intermittent problems with my cd working. I have a new battery and still having issues with it not wanting to charge. HP told me to uninstall the driver and see if that works. That did not help either. I have always had hp. computers. I don't know what happen to them.  The quality has gone down hill.

[artoleus]

Using Speedfan (speedfan) the cpu of my 6735s used to run between 65C and 95C.  The fan used to kick in after a couple of minutes and was very noisy.  It basically sounded very laboured vacuum cleaner. 

After a couple of months like this, the laptop failed (out of warranty by 2 months,) it wouldn't even start and showed a split blue and green light on the power input.  This signified a a hardware failure.

Since it would cost more than the laptop to repair and with no other options.  I decided to take the laptop apart to deduce the problem. I discovered a nice site for this take apart your laptop.

The fan was completely clogged with what looked like 2 cm's of carpet fibre.  I removed this. 

I then took out the CPU to see that it was covered in thermal paste(way too much) and that the paste was baked dry.  This can cause a gap between the CPU and the heatsink.  So using an alcohol based screenwipe I cleaned all the thermal paste off.  I brought some new thermal paste with silver in it and added a tiny amount and smeared it so that the surface of the CPU was covered with a thin layer(0.2mm -0.5mm).  I rubbed any remaining pasted onto the contacting heat sink and added a dab to the onboard graphics chip for good measure.

After re-assembling the laptop I turned it on and voila! I'm now writing this on my laptop.  Which is consistently running between 42C and 55C.  It is as quiet as a mouse  and is performing well.

So for anyone with a similar problem out there with a laboured fan, it is basically clogged and no amount of blasting with air is going to get out the dust accumilatted.  After reading up on the problem, and after looking at my 6735s's fan I can safetly say that the fan has a design fault.  Where the fan overshoots the heatsink by half a centimetre HP have taped over the fan outlet, leaving a little corner where dust can't escape.  No matter how diligent you are, the dust is going to build up and eventually clog the entre heatsink.

My advice is if you are still in warranty, speak to HP support and get the laptop sent off so that the fan / heatsink can be cleaned of all dust.  It is a design fault, its their fault, so fight your corner and get it sent off for repair.

Peace.

[pete14_]

Hello All My 6735s has been getting really hot over these last few months.. (since around feb) The one year warranty ran out in january of this year =/ I had a look at the temperature of my CPU and it was always around 90C! Sometime's going up to 100C.. Today I took it to the shop i bought it from but that was a dead end. So i decided to take it apart myself and clean it out. Which was a success. Thanks for the link! when i first turned it on after cleaning it out, it was around 58C. Now, after half a day's use, its around 68 at the moment, going up to 75 at some times.. Is this OK? I know now there is a design fault but is 75 an ok temperature or is it still too high? Thanks Pete

[femtondeseptemb]

I also have a problem with my fan. Even if I'm not having any heavy programs or processes running, the fan sounds awfully loud. It almost makes me embarrassed of it, taking it to school. Is there any way you can make it sound less? Maybe that's why it also gets so **bleep** hot all the time.

[y2bom]

same problem here. have you guy resolved the issue?

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Cerebella wrote:

Hi there,

I have had a 6735s laptop for about 4 months now, and since day one I have had a problem with the fan. 

When using my laptop for games or full screen films, the fan runs full power, which is understandable But when I am just browsing the internet, playing music or even have only just turned it on, the fan runs at full power, sounding like a vacuum cleaner and subsequentially ruins the battery life when I do not have the power cable plugged in.

Does anyone else have this problem? Using Everest, I have found that the CPU has hit 70 degrees C when just playing music using iTunes, 80 from start up and up to 95 degrees C when playing a game. This has become increasingly worrying, becuase of possible burn accidents, or damaging furniture when placing such a hot laptop on it.

I have also had the problem of almost shorting out my entire house when I plug in the power cable. I understand this may be an issue with the electrics here, but I'm pretty sure all the lights shouldn't go off & on when I plug in my laptop to charge.

Thanks in advance for any answers.

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[smileygeckos]

It's a HP laptop.

What do you expect...

[imbadwithlaptop]

I had this very problem for well over 6 months and assumed it was because I was treating it pretty badly. I would turn it on and the fan would immediately sound like it was ready for take off. But in a desperate hope, last night I looked around and found this page. I felt too impatient to wait for an air duster to be delivered, and decided to take artoleus' advice.. and i disassembled my laptop. I don't know a thing about laptops or how they work, all I wanted to do was get to the fan. In about 5 minutes I got to the fan and there it was... the dust! I got out about 3 big chunks of the stuff!

Anyway, it's amazing now. The fan is purring and my legs and wrists have a chance to heal from their 2nd degree burns!

Now I'll just look into getting a new battery seeing as the fan killed the current one!

Thanks guys!

[bobarella]

hey the info here is helpful. http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01007591&cc=us&dlc=en&lc=en&jumpid=reg_R1002_US... 

my HP 6735s had been whirring for months. Getting really hot and making lots of noise.

i updated the BIOS and vacuumed the vent on the left side.

problem fixed - at least its stopped the noise for the meantime....

[Michael-XX]

That's the problem:

I have tried to remove the wool from outside by vacuum and compressed air: No way! :-(

You will have to open your 6735 and remove it. Don't worry; it takes just 15 Minutes and gets faster with every loop.

[andrew7oaks]

I've just gone through this painful procedure described above . Some comments:

1. If the HP Compaq 6735s is still under guarantee, GET IT REPAIRED.

This repair, it's just so tedious, even if you are of a practical disposition. But I suppose you get to know how thousands (? millions) in the Third World are earning their daily bread.

2. You will not get all the dust out of the fan without disassembling the laptop completely. I tried the air can etc before disassembling - it will not clear the fan.

See the references - insidemylaptop is the one to use.

3. Make sure you have the thermal paste for the CPU, and a good set of tools.

4. Label up the screws as you take them out.

5. A magnifying glass is useful.

The trickiest bit is the ribbon cables - the touch-pad in particular - if you re-insert the black holding piece incorrectly there will be no electrical connection, and the laptop wont start. So you have to disaaemble it again ....

6. Do everything carefully and don't rush - if you snap a few bits of plastic here and there the laptop will be U/S.

7. Use the  speedfan 4.x software  afterwards to keep monitoring the temperature.

8. I think it is all working now .....