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Acer Predator Mobo boot once every 10 times

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    #1

    Acer Predator Mobo boot once every 10 times

    I got this mobo naked, but after some search it seems that it's from a G3620 predator desktop.
    Once the mobo is booted, it works 100%, but if i reboot or turn it off, again i need to try 10 times before it starts.
    Motherboard is : acer ipimb-ar rev1.02a with latest bios from 2013 (updated from windows)
    I have noticed that the voltages are all low with "Speccy"
    Here i guy with the same pproblem, solved on updating bios :
    http://community.acer.com/t5/Predato...ng/td-p/424611

    Photo with the voltages :

    Attached Files
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    #2
    Re: Acer Predator Mobo boot once every 10 times

    the reason why updating bios fixed it, is because the bios flash memory chip is wonky. some boards are known to exhibit an inability to start the post again after a reboot which is sometimes caused by the bios flash mem chip losing its contents. reflashing fixes that so it works again.

    btw, u cant trust software to read the voltages. software often gets the voltages wrong. measure it using a multimeter.

    im also gonna assume oems like acer tend to use junk caps in the power supply. so the mobo could have been damaged by a junk psu. show a photo of what caps are on the mobo.

    Comment

      #3
      Re: Acer Predator Mobo boot once every 10 times

      Originally posted by ChaosLegionnaire View Post
      the reason why updating bios fixed it, is because the bios flash memory chip is wonky. some boards are known to exhibit an inability to start the post again after a reboot which is sometimes caused by the bios flash mem chip losing its contents. reflashing fixes that so it works again.

      btw, u cant trust software to read the voltages. software often gets the voltages wrong. measure it using a multimeter.

      im also gonna assume oems like acer tend to use junk caps in the power supply. so the mobo could have been damaged by a junk psu. show a photo of what caps are on the mobo.
      Are you saying that the problem is the bios IC and need a replacement ?
      Cause i already have flashed the bios before (with programmer) and this didn't solve the problem.
      If i post a picture, can you tell me which cap's should i also replace ?
      Thanks

      Comment

        #4
        Re: Acer Predator Mobo boot once every 10 times

        what power supply are u using to run the board anyway? please tell me its a good branded unit...

        Comment

          #5
          Re: Acer Predator Mobo boot once every 10 times

          Originally posted by ChaosLegionnaire View Post
          what power supply are u using to run the board anyway? please tell me its a good branded unit...
          Oh yeah, tested 4 diferent psu, from 450W to 600W Corsair
          No diference ...

          Comment

            #6
            Re: Acer Predator Mobo boot once every 10 times

            I have replaced the bios chip with a brand new windond IC, no change !
            Booted on first try, but on reboot black screen ...

            Comment

              #7
              Re: Acer Predator Mobo boot once every 10 times

              Anyone please ?
              I can't find any schematics or boardview, only a service manual
              Any tip is welcome
              Attached Files

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                #8
                Re: Acer Predator Mobo boot once every 10 times

                If i were you , i would start by trying another Cpu , another Rams , and in between changing capacitors on board . About CPUs , when they are at their end's ages , whatever it is , they may do similar symptoms .. I saw it many times , CPUs doing different weird things , like waking up after many tries , for one or two times , then in the third , they would show slow Rams counting or black screens . Some even could boot in safe mode or restart when VGA enter full resolution .

                In case you did all the above , then it's time to think seriously about reflowing the board in an oven ...

                Comment

                  #9
                  Re: Acer Predator Mobo boot once every 10 times

                  To tell the truth ... Among thousands of mobos i did repair , few cases showed that the boards are not repairable , unless they were too much outdated or not worth the repairing budget and time .

                  Each time i ask myself the same questions , What's the benefit if i repaired a Pentium 3 or 4 board , when i have next to it an Icore2 or 5 ? . When a Pentium three or 4 worth zero ?..

                  Comment

                    #10
                    Re: Acer Predator Mobo boot once every 10 times

                    Well, this is not a pentium, and mobo is from end 2012 !
                    All that you sugested is done, all except put in a oven, this is not a good advice from someone that repaired thousands of mobos, but you are free to do it buddy ...

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