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    #1

    powers on then immediately shuts off

    I have a laptop that powers on then immediately shuts off. It does this even when benched(board taken out of laptop; no battery connected).

    What things should i check first?
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    #2
    Re: powers on then immediately shuts off

    overheating! open up fan housing an clean inside of metal grate!

    Comment

      #3
      Re: powers on then immediately shuts off

      Originally posted by t.j. View Post
      overheating! open up fan housing an clean inside of metal grate!
      sorry but I'm pretty sure it's not overheating. it shuts off approx 1 sec after it turns on. fan is also clean.

      Thanks for the response. I'm an open person, i'll take any suggestions anyone throws at me. It helps me learn by trying out different suggestions. I hope to one day give back to this forum also. But i guess i have a long way to go.
      Last edited by LiquidCap; 08-22-2013, 07:51 PM.

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        #4
        Re: powers on then immediately shuts off

        What brand/model is the laptop?

        If the cooler doesn't make contact with the CPU, then it will overheat almost instantly
        I love putting bad caps and flat batteries in fire and watching them explode!!

        No wonder it doesn't work! You installed the jumper wires backwards

        Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

        Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

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          #5
          Re: powers on then immediately shuts off

          HP Pavillion DV4. Heatsink is firmly fastened to bracket.

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            #6
            Re: powers on then immediately shuts off

            try to trace short on mother board or its a gpu issue

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              #7
              Re: powers on then immediately shuts off

              sorry for taking so long to reply. how would i trace the short? what exactly do you refer to as a short?

              sorry for my lack of knowledge in this area. i do basic pc repairs(swap parts out, which is easy) but i want to take my skill further by actually trying to repair specific components and not just replace them. Fixing this laptop for actual use isn't even important to me. it's mostly for the learning experience. you guys will definitely see me roaming this forum more often from now on.

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                #8
                Re: powers on then immediately shuts off

                Hello LiquidCap,

                i think that problem is in power supply to GPU.
                As you said, laptop turns off after cca. 1s.
                Power supply need approx. 1s to start all voltages and to do all necessary checks on motherboard.

                look for 5v, 3v or Vcc on GPU for short to GND.

                Comment

                  #9
                  Re: powers on then immediately shuts off

                  Originally posted by mujagic View Post
                  Hello LiquidCap,

                  i think that problem is in power supply to GPU.
                  As you said, laptop turns off after cca. 1s.
                  Power supply need approx. 1s to start all voltages and to do all necessary checks on motherboard.

                  look for 5v, 3v or Vcc on GPU for short to GND.
                  It just might be the GPU. Before the problem of instantly shutting off, the laptop had a problem where it would not output any video(LCD nor external vga) sometimes when it boots.

                  Anyways, realizing my lack of knowledge in electronics I've decided to learn some basic electronics before going any further. I'll find some free resources on the internet about electronics and read up on them. Thanks to all of you for your help.

                  Comment

                    #10
                    Re: powers on then immediately shuts off

                    any updates on this issue?

                    Comment

                      #11
                      Re: powers on then immediately shuts off

                      how about a list of those resources, or better yet how about a zipped archive of pdf printouts of said resources?

                      Comment

                        #12
                        Re: powers on then immediately shuts off

                        check all big coils for resistance to ground. find something lower than 5ohm

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