Acer TC-705 i7 CPU Fan is not spinning. Is it due to Graphics Card which is faulty that's causing?

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  • Larryodie
    Larryodie Member Posts: 2,001 Expert Leader

    I don't see "Push Button" Restore on Win 11 but it's probably the same as Recovery. Which you don't need unless you have trouble. HOLDING THE SHIFT Key while restarting will get you into safe mode with the troubleshoot/repair option.

    I'm lost about grommets or fitting the fan.

    GET THE numbers off of the bad fan and google these #'s.

    Otherwise you need pictures showing the grommets. Hold up doing any crazy glue as it won't hold long with the heat and vibration.

    Which direction is the fan blowing air ?? IN Or Out ?

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Dear Larryodie,

    Many thanks for your further comments. I'm keen on having the start-up disc facility because of the most unsatisfactory 7-hour wait I had when the computer was telling me that it was repairing my system when in fact it was unable to do so at all. I am still not quite sure why my system went wrong but it followed an Outlook.com programme turning into the Russian language I think it was.

    I hope to get the original faulty fan back on Tuesday (and its screws) so I can see what's what. It is apparently an 80mm fan as the technician mentioned in his last e-mail to me. I was wondering if there is an adaptor to allow a larger fan to be connected as I think that larger fans normally make less noise or otherwise I would like to get a quiet 80mm (if this is correct) fan of good quality (perhaps better than the Acer one which became faulty).

    I checked that the (wrong size) Noctua 92mm fan would be blowing air into the heatsink below it but as mentioned, it is presently only in situ relying on being wedged in by the four added rubber grommets/washers which the technician cleverly attached to the sockets with screws where I presume the fan's screws are supposed to go but this is an unsatisfactory arrangement.

    Possibly StevenGen can help to track down a good quality fan that I can screw into the heatsink that will suit the Acer TC-705 i7-4790 said to be an 80mm unit rather than the 92mm size thought to be right for the Acer.

    Regards, Victor. 18th May 2025 2am

  • Larryodie
    Larryodie Member Posts: 2,001 Expert Leader

    Amazon shows adapters. When you get the original fan. Google the numbers written on it to find a replacement.. My fan blows outward from the cpu.

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Dear Larryodie, oh dear I thought that the CPU Fan was to blow cold air into the hot metal heatsink to cool it? I.e. when I use large Panasonic Fans to blow into my older computers (with the side panels removed), they are blowing cold air (sometimes aided by ice containers in the airflow) onto the Graphics Card and Fan & Heatsink areas. Can we double-check this please?

    Regards, Victor 18th May 2025

  • Larryodie
    Larryodie Member Posts: 2,001 Expert Leader

    I may be wrong ?

    As I just put a kleenex at the vent holes and there was no movement ?

    My fan is running 85 degrees average now.

    image.png
  • Sdroid
    Sdroid Member Posts: 7

    Tinkerer

    edited May 19
    20230815_152945.jpg

    This is what I did on my xc-1760.

    Filed down the edges until it fit and used a type of steel wire that new cables usually comes with

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Dear Sdroid,

    How exactly have you threaded the four cable-ties?

    Thanks, Victor. 19th May 2025 12.21pm (London, UK)

    PS. Is your fan blowing into the heatsink below it or should it be vice versa as per Larryodie's fan.

  • Sdroid
    Sdroid Member Posts: 7

    Tinkerer

    edited May 19

    It's blowing into the heatsink

    It's been like this for almost two years (August)

    1000007666.jpg 1000007667.jpg
  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Dear Larryodie,

    In your picture, I wonder what programme gives you all those temperature readings?

    I have a small free programme "CPU-Z" - please see the attached my scan (using Capture Wiz Pro) of just the CPU section.

    It states Max TDP 84W

    Is this OK?

    Thanks, Victor 19th May 2025 12.40

    pm (London, UK)

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Many thanks for the extra pictures Sdroid (and your very prompt reply) - I see that there has been clever "plastic surgery" carried out by you but I would hesitate to try this myself.

    The black round fan picture in your previous posting is perhaps your original fan. Maybe it is an 80mm fan?

    If so, would it be OK for my TC-705 i7-4790 as your Acer is a different model to mine?

    I am also interested in seeing if there is a fan adaptor from 80mm to 92mm (the latter seems to be the popular size) and I will check on Amazon as Larryodie kindly suggested later today.

    I am still mystified by the short thick screws that came with the new Noctua NF-B9 redux- 1600 PWM Fan (92 x 92 x 25 mm) whereas it seems to me that what is needed is a long slimmer screw to, apart from the head of the screw, pass through the 1" gap between the two layers of the Noctua Fan's structure.

    Regards, Victor 19th May 2025 1.06pm.

  • Larryodie
    Larryodie Member Posts: 2,001 Expert Leader

    I use Speccy. Be careful using download sites.

    https://www.ccleaner.com/speccy/download

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Dear Larryodie,

    Thank you very much for the name of the programme "SPECCY". I just downloaded it (the free version). Please see embedded below my Acer TC-705 i7-4790 results on the CPU tab.

    You will see that my currently wedged-in Noctua 92mm fan is spinning at about twice the speed of your computer's fan but my CPU temperature at 35 degrees centigrade (95 Farenheit) is 12% higher than yours (85 F), which is not so good!

    SPEECY information TC-705 i7-4790 (Victor).jpg

    I am still waiting for the return of my faulty apparently 80mm fan (the original fan that came with the Acer TC-705 i7-4790) and I want to check the measurements i.e. the overall dimensions L, W & H. I also want to see what the measurements are between the middle of the fixing holes both horizontally and vertically.

    The quiet 17.6 dB(A) Noctua Fan 4-Pin NF-B9-redux- 1600 PWM I recently purchased turned out to be a 92 x 92 x 25 mm one and at the moment and as it does not fit the Acer TC-705, it is just perilously wedged in between some grommets/washers that the technician rigged up for me to fit a 92mm Lanshuo Fan that he had to test my machine (when he soon discovered that my Graphics Card was not faulty as the NW London engineer had surmised).

    FAN ADAPTOR: I have found one seller in Germany who has a Fan Adaptor 92mm to 80mm which costs about £20 including postage but I am still unsure where screws have to go and what kind of screws are required.

    I noticed that there is an old posting on the Forum about the TC-705's fan made by another member with pictures about 2 years ago. I just glanced through 126 pages on this topic but I missed the posting. What I would very much like to do is to contact a member who still runs an Acer TC-705 i7-4790 with its original fan and heatsink etc to ask some more questions about screws, noise, etc.

    In the meantime, I wonder if anyone could find a high quality quiet 80mm Fan that would fit onto the Acer metal heatsink?

    Thank you, Victor 20th May 2025 12.27pm (London, UK)

  • Larryodie
    Larryodie Member Posts: 2,001 Expert Leader

    Yes mine is running 810 RPM now but it is connected as a SMART FAN via Bios settings.

    I used to be able to view Speccy on top realtime ALWAYS showing but I can't anymore ???, Anyone.

    As I said when you get your old fan back, google the numbers written on it, then you'll have specs to go by or perhaps a direct hit on the part #. Nothing says that you have to use a different brand of fan ?

    ENABLE your SMART FAN up in BIOS and it'll take care of speed and on/off as it monitors the temperature and adjusts the voltage to the fan.

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Dear Members, At last I have back my original but faulty fan which came with my Acer TC-705 i7-4790.

    The fan is a black "COOLER MASTER" part number FA09025H12LPB, DC 12v 0.36A with a white 4-pin plug. The plug has been opened up by the technician when he was carrying out a test of the fan.

    On the side of the fan there is another number DC108110135030093BCM00

    Please see below two photos that I just took:

    Cooler Master original TC-705 i7-4790 Fan FA09025H12LPB  DC 12V  0.jpg Label side_TC-705 i7-4790 original fan.jpg

    I measure the round fan as being about 95mm in diameter (ignoring the 8 holes protrusions) and the depth is about 25mm. The width between the middle of the holes is about 102mm (longer length) and 72mm (shorter length).

    I have two immediate questions:

    1. Why are there 8 holes when only 4 screws are involved to secure the fan to the heatsink?
    2. When fixing the fan to the heatsink below it which set of holes should be used (upper ones at the top or lower ones at the base of the fan right next to the heatsink?

    I have a similar question relating to the Noctua I bought the other day (92 x 92 x 25mm). The fan is made with two layers with screw holes in line on both the upper and lower levels. Which set of holes should one use when fitting to a relevant heatsink? If the lower holes, is the upper hole there to allow a thin screwdriver secure the lower level screw or are you supposed to use a longer screw that passes through the upper hole and then into the lower hole?

    I will now try to find the specifications for the COOLER MASTER but I suspect they will be noisier than the Noctua presently wedged in by grommets/washers.

    The technician who helped me mentioned that I need an 80mm fan but nothing on the faulty COOLER MASTER measures 80mm?

    Is there a high quality fan than will actually fit on top of my Acer heatsink?

    Thanks for any comments, Victor 20th May 2025 9.25pm.

  • Larryodie
    Larryodie Member Posts: 2,001 Expert Leader

    Make it simple and move on , replace it with the same as it's lasted a longtime and should be the exact Amazon has it for $13.95. Extra screw holes are probably for different mounting applications.

    image.png
  • Larryodie
    Larryodie Member Posts: 2,001 Expert Leader

    Buy a tube of thermal paste, after you clean the old and dry, smear on the cpu. (Youtube )

    also Enable the Smart Fan in your bios.

    Good Luck .

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Dear Larryodie,

    Thermal Paste: isn't this to smear between the CPU and the heatsink? I am not lifting up the heatsink merely wanting to change the fan at the top. I definitely don't want to handle the heatsink/CPU joint area.

    I see that the COOLER MASTER (21 - 29dB(A) is noisier than the Noctua (17.6dB(A) currently wedged in. I would still like to get a better fan. Two German fan makes look to be very good quality but to me are complicated selling PWM fans with unknown dimensions for the actual holes. I might write to one of them to enquire whether their 80mm version's holes positioning would be compatible - I find the dimensions information inadequate as they do not give the holes positioning which is what counts as I see it.

    Looking at an old January 2021 posting by Fejj, there is a good photo of his TC-705 i7-4790's fan as below and now I see where the four lower small screws go at about 1.30, 4, 7 & 10.30 clock face positions.

    Fejj's Forum photo of his TC-705 in January 2021.jpg

    Thanks again,

    Victor 21st May 2025 1.53am (London UK time)

  • Larryodie
    Larryodie Member Posts: 2,001 Expert Leader

    You've got the original to measure plus Amazon gives the dimensions of the fan ?

    The computer is 10 years old and have you had problems with the noise of the original fan ??

    Sorry about the thermal paste, I thought that you has to tear it down to the heat sink ??

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon
    edited May 21

    Dear Larryodie,

    In summary, the COOLER MASTER fan is readily available on the Web, we can see. You'll recall that the problem with the old fan was that it stopped spinning. The first engineer in NW London diagnosed that the Radeon R7-240 Graphics Card was faulty and preventing the fan from working. I paid the first engineer £35 and he wanted another £99 plus £40 odd for a new R7-240 card and checking it all out. Luckily, I retrieved my Acer from him and later a friend of a friend discovered that the original's fan coils were not working properly and he fitted a temporary Lanshuo fan by wedging it in between some grommets. I then purchased the Noctua which StevenGen thought was compatible with the Acer. Unfortunately, whilst this fan is very quiet at only 17.6dB(A), the screw holes are not compatible so again, it is merely wedged in by the grommets.

    NB. Although Acer themselves used the R7-240 Graphics Card, there are several comments on the Web that this card requires a 400w or more PSU!

    I am tempted to simply super-glue the Noctua fan in but this would cause problems if it also later goes wrong. Sdroid used cable-ties to attach his non-compatible fan and filed off part of the corner of his fan. I don't want to try anything like that myself.

    So far, I cannot find any compatible-fitting fan in the UK which is superior to the COOLER MASTER 21 - 29dB(A). I have really gone off this fan however the situation seems hopeless and one is compelled to use the COOLER MASTER which is a lower quality compared to the Noctua Fan (which doesn't fit). Maybe there could be an adaptor but again there is no information as to the holes spacing.

    Some refer to 80mm fans but nothing on the COOLER MASTER measures 80mm!

    As to measurements, no manufacturer seems to give the key details of the spacing of the 4 or 8 holes relevant to where the screws go in. Dimensions are given of the whole body of the fan and sometimes these are not accurate either and these do not help me check compatibilty with the Acer's heatsink.

    Trying to sort this out remotely without hands-on inspection of the various fans is difficult for me.

    Regards, Victor 21st May 2025 12.07pm (London)

  • Victor77
    Victor77 Member Posts: 59 Enthusiast WiFi Icon

    Dear Larryodie, further to my last posting above, I have written to NOCTUA Technical Support in Austria asking about three of the fans shown below (NF-A8 PWM, NF-R8 redux-1800 PWM and NF-A8 PWM chromax.black.swap). Noctua have acknowledged my e-mail about my wish for a better quality (presumed 80mm) fan than the COOLER MASTER and one that actually aligns with the screw holes of the metal heatsink. The middle one NF-R8 redux-1800 PWM seems closest to my larger B9 Noctua (which is 1600 RMP) and is only 17.1dB(A). Regards, Victor 1.50pm London UK 21st May 2025

    NOCTUA 80mm Fans.jpg