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ACER XC-603 (DBSUM11) schematic and boardview, else similar

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    ACER XC-603 (DBSUM11) schematic and boardview, else similar

    Have an Acer J2900 based MiniITX mainboard that simply refuses to turn on and gives me *nothing* (tried different PSUs too, all items removed, different RAM, even popped the RTC battery and tried without RAM to see if I can get it to complain, PSU fan won't spin up even - tests fine with PSU tester).

    First place for me to start would be the turn-on circuit but while I have plenty of laptop schems/boardviews I noticed I don't have a single one for a miniITX or standard PC mainboard (I'm assuming that almost all of them will have a very similar turn-on circuitry setup).

    *edit: yes, I've tried a different switch for the on/off button, and just shorted it.
    Attached Files
    Last edited by inflex; 07-22-2016, 06:59 PM.
    YouTube Repair Videos - https://www.youtube.com/user/19PLD73
    FlexBV BoardView software - Linux/OSX/Windows - http://pldaniels.com/flexbv

    #2
    Re: ACER XC-603 (DBSUM11) schematic and boardview, else similar

    Fun fact of the day - the CPU fan, if dud, will do this :-o

    Goes to show, even after all these years, there can still be simple but amusing things to learn.
    YouTube Repair Videos - https://www.youtube.com/user/19PLD73
    FlexBV BoardView software - Linux/OSX/Windows - http://pldaniels.com/flexbv

    Comment


      #3
      Re: ACER XC-603 (DBSUM11) schematic and boardview, else similar

      So it was just the CPU fan that was dead that was causing the motherboard not to boot (I am guessing due to lack of RPM fan pulse from the fan)?

      If so, I wonder what killed the fan. Perhaps someone tried to clean the motherboard and fan with compressed air and let the fan spin / spool up to really high RPM? I know from experience that some fans don't take it too well when you do that. The high RPM makes the fan coils produce a high back-EMF - sometimes enough to take out the fan controller/switch IC and possibly other components connected to it.

      So be careful if using compressed air to clean fans.

      Comment


        #4
        Re: ACER XC-603 (DBSUM11) schematic and boardview, else similar

        On this particular client machine, I think it might have been something else, just bad luck - but yes, I've had some people do the compressed air thing and ruin the fans.

        To date, prior to this event, I was more used to a failed fan simply causing a BIOS warning and subsequent shutdown.

        Somewhat more amusing since this is a low-power system and could probably run for at least half an hour without the fan being needed.

        Lastly, if you swap it for a 2-pin fan (no RPM) it will boot
        YouTube Repair Videos - https://www.youtube.com/user/19PLD73
        FlexBV BoardView software - Linux/OSX/Windows - http://pldaniels.com/flexbv

        Comment


          #5
          Re: ACER XC-603 (DBSUM11) schematic and boardview, else similar

          Originally posted by inflex View Post
          To date, prior to this event, I was more used to a failed fan simply causing a BIOS warning and subsequent shutdown.
          Same here.
          Either shut-down, constant beeping from the motherboard speaker, or simply booting with just a warning.

          Originally posted by inflex View Post
          Lastly, if you swap it for a 2-pin fan (no RPM) it will boot
          Interesting. I guess the motherboard does have some kind of a detection circuit to see if a fan is connected. HP loves to do that too on their motherboards. For example, I have an HP DC7700 motherboard (Intel Maverick/Silverado) that will give a "Front Panel not connected" warning if the power indication LED is not connected. Same with front USB and front audio headers. But at least the board boots (though I do have to press the "F1" key every time after POST, which is somewhat annoying).

          Comment


            #6
            Re: ACER XC-603 (DBSUM11) schematic and boardview, else similar

            well thats idiot proofing your board to the extreme there, hp! guess we cant actually complain and that hp is justified in this extreme idiot proofing as only computer nubs buy oem systems... dont want them blowing up their computer or something... keke~

            Comment


              #7
              Re: ACER XC-603 (DBSUM11) schematic and boardview, else similar

              Originally posted by ChaosLegionnaire View Post
              well thats idiot proofing your board to the extreme there, hp!
              Actually, I think it is more for the assemblers / line workers at HP - that way it will be less likely that they forget something and have the PC arrive non-functional to the customer.

              Originally posted by ChaosLegionnaire View Post
              as only computer nubs buy oem systems...
              TBH, I think OEM systems are great sometimes. Yes, they do have much more limited BIOS options and whatnot, but if you are in the market for a *used* OEM system rather than a brand new one, you will be delighted because they are extremely cheap and parts are readily available.
              For example, look at what $135 can get me locally:
              http://www.ebay.com/itm/Dell-Precisi...item2caf5fe9ff
              That's a fully working *workstation* with a quad-core Xeon more or less equivalent to the early i5 and i7 CPUs. With 12 GB of RAM and PCIe 16x 2.0, I reckon a system like that would be useful for quite some time (at least 5 years).

              Also, many of the OEM systems are built in such a way that it takes minimal effort and tools to dis/assemble to save time at the factory. In that regard, I especially like Dell stuff made during (and a bit after) the socket 775 era. Not much of a fan of their clamshell cases, though (at least not the ones used during the Pentium 4 era).
              Last edited by momaka; 08-12-2016, 01:29 PM.

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