Haier L37A9A-A1 NO POWER

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  • s_henya
    Badcaps Veteran
    • Jan 2011
    • 480
    • Israel

    #21
    Re: Haier L37A9A-A1 NO POWER

    more bad news,

    the ic chips arrived. when looked at the psu, i saw a tiny smd transistor broken Q9.
    (had to put the pcb over bouble wrap, big mistake!)

    all that is written is: 2.A 1 ->the 1 is on its side.

    i dont know what to do,

    how can i know its specs.

    Comment

    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6457
      • Australia

      #22
      Re: Haier L37A9A-A1 NO POWER

      I'm thinking could be one of these, watch out for the different package sizes.

      Could it be the 1 is a "-" One of the NXP sheets has - 2A where - = Hong Kong

      Photo?
      Attached Files
      Last edited by tw2005; 05-07-2013, 07:01 AM.

      Comment

      • s_henya
        Badcaps Veteran
        • Jan 2011
        • 480
        • Israel

        #23
        Re: Haier L37A9A-A1 NO POWER

        im sure of the writing.
        never swapped such a transistor before, so i dont even know how to search for
        specs.
        added a picture for more reference.

        a schematic would be of help, even if i have to pay for it.
        Attached Files

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6457
          • Australia

          #24
          Re: Haier L37A9A-A1 NO POWER

          I'm confident 2A will be what I posted, but see what everyone else comes back with.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: Haier L37A9A-A1 NO POWER

            2N3906 sounds right for a driver transistor. There's no particular performance requirement there.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • s_henya
              Badcaps Veteran
              • Jan 2011
              • 480
              • Israel

              #26
              Re: Haier L37A9A-A1 NO POWER

              im sorry the one you suggested 2N3906
              is not smd
              any suggestion to smd?
              Last edited by s_henya; 05-07-2013, 09:34 AM.

              Comment

              • tw2005
                Badcaps Legend
                • Oct 2011
                • 6457
                • Australia

                #27
                Re: Haier L37A9A-A1 NO POWER

                Originally posted by s_henya
                im sorry the one you suggested 2N3906
                is not smd
                any suggestion to smd?
                What do you think all those datasheets are?

                Comment

                • s_henya
                  Badcaps Veteran
                  • Jan 2011
                  • 480
                  • Israel

                  #28
                  Re: Haier L37A9A-A1 NO POWER

                  ok so which one should i order, with this model all i can find
                  is penetrating components

                  Comment

                  • tw2005
                    Badcaps Legend
                    • Oct 2011
                    • 6457
                    • Australia

                    #29
                    Re: Haier L37A9A-A1 NO POWER

                    Any MMBT3906 in a SOT23 package. Do you have any old dead boards you could steal from? A chance you will find one otherwise you may have to buy a lot more than you need.

                    http://il.rsdelivers.com/catalogue/s...0883|A-432579| (UK stock)

                    http://www.digikey.co.il/scripts/dks...741&PV16=12624

                    http://www.ebay.com/dsc/i.html?_sadi...6&LH_PrefLoc=2
                    Last edited by tw2005; 05-07-2013, 03:15 PM.

                    Comment

                    • s_henya
                      Badcaps Veteran
                      • Jan 2011
                      • 480
                      • Israel

                      #30
                      Re: Haier L37A9A-A1 NO POWER

                      OK i listened to your advice and, looked at my junk boards that i stashed long time ago.

                      found similar transistor 2A 3 on the side. from a pci lan card.

                      should it fit?

                      i think that the are pretty gentle,

                      with temp should i use on the hot air?

                      or should i work with the soldering iron?

                      Comment

                      • tw2005
                        Badcaps Legend
                        • Oct 2011
                        • 6457
                        • Australia

                        #31
                        Re: Haier L37A9A-A1 NO POWER

                        I don't have hot air, I use 2 irons and heat all 3 pins at once. If what you found is SMD it should be the same size I expect. Was the location on the board marked as if it was a transistor like Q___ or PQ ___?

                        Comment

                        • s_henya
                          Badcaps Veteran
                          • Jan 2011
                          • 480
                          • Israel

                          #32
                          Re: Haier L37A9A-A1 NO POWER

                          Q9 as you can see in the pic ive added.

                          (thank you for the tip by the way :-) )

                          Comment

                          • tw2005
                            Badcaps Legend
                            • Oct 2011
                            • 6457
                            • Australia

                            #33
                            Re: Haier L37A9A-A1 NO POWER

                            No, on the pci donor board. I just want to be sure it's a transistor and not a diode but if you're sure it's a transistor I'd go with it. The sideways number is just going to be a production stamp, the 2A will be the mark.

                            Comment

                            • s_henya
                              Badcaps Veteran
                              • Jan 2011
                              • 480
                              • Israel

                              #34
                              Re: Haier L37A9A-A1 NO POWER

                              sorry didnt understood you before ,

                              its Q1 on the pci Card.

                              ill try to find some flux and get it out later tonight or tommorow.

                              hope to come back with good news.

                              Comment

                              • tw2005
                                Badcaps Legend
                                • Oct 2011
                                • 6457
                                • Australia

                                #35
                                Re: Haier L37A9A-A1 NO POWER

                                sounds good, hope it works out. adding fresh leaded solder to the pins will help to get it off faster since they use lead free which I dislike.

                                Comment

                                • s_henya
                                  Badcaps Veteran
                                  • Jan 2011
                                  • 480
                                  • Israel

                                  #36
                                  Re: Haier L37A9A-A1 NO POWER

                                  finally good news,

                                  replaced both the transistor and ic,

                                  it works!

                                  THANK YOU VERY MUCH!

                                  Comment

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