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help me please toshiba qfkaa la-8391p

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    help me please toshiba qfkaa la-8391p

    toshiba qfkaa la-8391p rev 1

    power 5 seconds led worked with close

    vcore not voltage
    vram not voltage
    there are 5v and 3v

    #2
    Re: help me please

    GPU or PCH. Probably GPU

    Comment


      #3
      Re: help me please

      Check if you have PM_SLP_S4#, SUSP#, PM_SLP_S3#, SYSON and VR_ON signals.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment


        #4
        Re: help me please

        UCL1 check pleas
        Attached Files

        Comment


          #5
          Re: help me please

          just had this fault and resoldered pu330, og1 and ucl1 and all working fine now.

          Comment


            #6
            Re: help me please toshiba qfkaa la-8391p

            Same problem,resoldered ucl1,working now.Thanks

            Comment


              #7
              Re: help me please toshiba qfkaa la-8391p

              Wow.Resoldered ucl1,working now.Thanks

              Comment


                #8
                Re: help me please toshiba qfkaa la-8391p

                Hot Air in ucl1 and the laptop revive!! manny thanks

                Comment


                  #9
                  Re: help me please toshiba qfkaa la-8391p

                  Worked for me, thank you friends!

                  Comment


                    #10
                    Re: help me please toshiba qfkaa la-8391p

                    Don’t worked for me. Plz can you help me

                    Comment


                      #11
                      Re: help me please toshiba qfkaa la-8391p

                      Thank you sir, ULC1 looked fine, but resoldering it worked.
                      Cheers

                      Comment


                        #12
                        Re: help me please toshiba qfkaa la-8391p

                        Another UCL1 reflow and sucess!!
                        Thanks!

                        Comment


                          #13
                          Re: help me please

                          Originally posted by vedoza View Post
                          UCL1 check pleas
                          No power on these pins... none

                          Comment


                            #14
                            Re: help me please toshiba qfkaa la-8391p

                            Found, if the RTC Battery have less then 2,8v the computer won't work, I change Battery for other charged and pc turn on OK

                            Comment


                              #15
                              Re: help me please toshiba qfkaa la-8391p

                              Hello, i have this problemfrom the discussion, I realized that it’s a good option to resolder ucl1, but I don’t understand where it is located on the motherboard, even according to the diagram that was thrown off above (an ordinary stupid student who wants to bring his only laptop back to life)

                              Comment


                                #16
                                Re: help me please toshiba qfkaa la-8391p

                                Search for a small rectangular black chip that will have 4 solder pins on each side. For a total of 16 contacts.

                                This part will be 2mm * 3mm in size.

                                It is a TQFN package so will be a thin height, quad flat shape with no pins but with flat solder tabs under the chip itself.

                                Post picture of anything that may resemble this shape.

                                Comment


                                  #17
                                  Another Toshiba P850 that works after soldering UCL1
                                  This chip provides clock signal for the RTC

                                  Click image for larger version

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                                  Comment


                                    #18
                                    Thanks so much for your update.

                                    Comment

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