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Sony MBX-223 ,M971 , Shutdown after 40 seconds

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    Sony MBX-223 ,M971 , Shutdown after 40 seconds

    Hi.! This Sony board turns off after 40-42 seconds.
    (with adaptor/battery or both)
    Don't turn on until 20 seconds,
    If I disconnect Power immediately when off,than I can turn on, than again stays on same time, aprox 40 seconds

    Did changed ,
    thermal paste, CPU.
    Flashed bios also.
    fan heatsink also clean
    Before turning off fan also turns on.
    Any points I am missing
    Thanks

    #2
    Re: Sony MBX-223 ,M971 , Shutdown after 40 seconds

    Originally posted by ravi_1617 View Post
    Hi.! This Sony board turns off after 40-42 seconds.
    (with adaptor/battery or both)
    Don't turn on until 20 seconds,
    If I disconnect Power immediately when off,than I can turn on, than again stays on same time, aprox 40 seconds

    Did changed ,
    thermal paste, CPU.
    Flashed bios also.
    fan heatsink also clean
    Before turning off fan also turns on.
    Any points I am missing
    Thanks
    https://www.alisaler.com/sony-vpceb3...x-223-bios-ec/

    burdaki bios ve ecc cözdü
    write kbc bios please

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      #3
      Re: Sony MBX-223 ,M971 , Shutdown after 40 seconds

      Having exact same issue on very same motherboard-sony mbx-223 M971 rev 1.1. Clean me bios flashed, ec bios also flashed. there is display on screen but shutsdown in 30-40 seconds. Has anybody solved this??

      PS: As per some russian forums, its me region of bios but i've already tried clean me bios. Just want few opinion before going ahead with PCH replacement. CPU/RAM swapped with known good.Heatsink cleaned,Fan perfectly working.
      Last edited by mcplslg123; 03-24-2022, 06:31 AM.

      Comment


        #4
        Re: Sony MBX-223 ,M971 , Shutdown after 40 seconds

        I have the same model and the moment i press power it turns on for 2 sec and shuts off. there is no shorting in any aux power rails. I read one post where if i disconnect the resistor to memory enable the laptop remains on for every but i dont get cpu voltages or ram voltages.But again changed the memory chip smsp same problem.Something to do with sony protection circuit for some models.

        Comment


          #5
          Re: Sony MBX-223 ,M971 , Shutdown after 40 seconds

          @guruji, your case differs with op's case as he gets all voltages, mb boots and then shutsdown in 40 secs.

          If you cut the power to memory, cpu core/gfx core wont rise. So it means you either have problem in ram circuit or VCore circuit. Very likely, not a protection issue here.

          Comment


            #6
            Re: Sony MBX-223 ,M971 , Shutdown after 40 seconds

            i have changed the ram dc-dc controller still same issue.this is like a common issue with this model.

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