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toshiba U400/M300/ cannot get 3,3 an 5V

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    #1

    toshiba U400/M300/ cannot get 3,3 an 5V

    Hello.
    Have this one with bad ICH. replace it but cannot get 3,3V and 5V from ISL6237. No short on rails, powers to chip looks good, EN1/EN2 ok, even REF signals is there. but cannot get it to start. I replace ic fron another board but still the same results

    Any help for this?
    Attached Files
    Tags: None
    #2
    Re: toshiba U400/M300/ cannot get 3,3 an 5V

    find RTCRST# on kbc and post values before and after pressing power bt

    and RSMRST
    Last edited by dj_ricoh; 12-14-2014, 03:07 PM.
    Just cook it! It's already broken.

    Comment

      #3
      Re: toshiba U400/M300/ cannot get 3,3 an 5V

      Originally posted by dj_ricoh View Post
      find RTCRST# on kbc and post values before and after pressing power bt

      and RSMRST
      I think u need a sleep for this day

      no 3,3V = no power to anything. no power to switch, no power to KBC

      Comment

        #4
        Re: toshiba U400/M300/ cannot get 3,3 an 5V

        on pin 11 fb1 voltage?

        Comment

          #5
          Re: toshiba U400/M300/ cannot get 3,3 an 5V

          any fets broken?

          how many volts you got on rtc battery?

          the rtc makes VCCRTC so thats you first pass the it goes to normal after you plug the charger.

          it disable the rtc and makes the vcc from adapter so maybe maybe
          Just cook it! It's already broken.

          Comment

            #6
            Re: toshiba U400/M300/ cannot get 3,3 an 5V

            i just read case on SN0608098RHBR losing voltage on vfb1 causing 3.3valw/5valw can't come out, maybe its a culprit.

            look like its similiar pin
            Last edited by meritosari; 12-14-2014, 03:47 PM. Reason: wrong input ic

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              #7
              Re: toshiba U400/M300/ cannot get 3,3 an 5V

              here u have all voltages in ISL6237
              Attached Files

              Comment

                #8
                Re: toshiba U400/M300/ cannot get 3,3 an 5V

                You need to check the 3.3v and 5v SMPS rails with a DSO when power is first applied. The rails could be coming up then soon after going down because of some protection trip.
                I had something once where the 5v rail was getting up to 6v, then back to 0v because of a leaking high side MOSFET. This all happens in a few milliseconds.

                Comment

                  #9
                  Re: toshiba U400/M300/ cannot get 3,3 an 5V

                  Damn mate u have right

                  All voltages goes up but after 1-2 seconds goes down. I check pl9 that gives 1.05V and have 13ohm instead of 50ohm on the other board.

                  Comment

                    #10
                    Re: toshiba U400/M300/ cannot get 3,3 an 5V

                    That shouldn't be a problem. It's something else.
                    Originally posted by PeteS in CA
                    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                    A working TV? How boring!

                    Comment

                      #11
                      Re: toshiba U400/M300/ cannot get 3,3 an 5V

                      yes its that damn ICH. removed it and have stable voltages.
                      must find some working ic.

                      Comment

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