No 5V found in this Circuit, Please help me.

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  • Compute
    Master
    • Oct 2014
    • 97
    • Russia

    #41
    Re: No 5V found in this Circuit, Please help me.

    Originally posted by nazrul145
    Yes motherboard works fully ok.
    COOL

    Comment

    • Compute
      Master
      • Oct 2014
      • 97
      • Russia

      #42
      Re: No 5V found in this Circuit, Please help me.

      Originally posted by nazrul145
      asus X451ma Schematic.
      This is written on the motherboard?

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      • Compute
        Master
        • Oct 2014
        • 97
        • Russia

        #43
        Re: No 5V found in this Circuit, Please help me.

        this scheme is nowhere

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        • nazrul145
          Badcaps Veteran
          • Jan 2014
          • 333
          • BD

          #44
          Re: No 5V found in this Circuit, Please help me.

          yes X451MA Rev 2.1

          Comment

          • Compute
            Master
            • Oct 2014
            • 97
            • Russia

            #45
            Re: No 5V found in this Circuit, Please help me.

            Originally posted by Compute
            this scheme is nowhere
            I looked at all the closed resources, but this scheme nobody has

            Comment

            • nazrul145
              Badcaps Veteran
              • Jan 2014
              • 333
              • BD

              #46
              Re: No 5V found in this Circuit, Please help me.

              OK, This ic marking is JC FL. i think it is RT8239B. it pin2 is 0.9v and pin4 is 5v. when i short pin4 to ground with twezer then 3.3v comes to Coil and power up laptop.
              Attached Files

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              • Compute
                Master
                • Oct 2014
                • 97
                • Russia

                #47
                Re: No 5V found in this Circuit, Please help me.

                Here about the same.
                Resistor on pin 4 has a 100k?

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                • Compute
                  Master
                  • Oct 2014
                  • 97
                  • Russia

                  #48
                  Re: No 5V found in this Circuit, Please help me.

                  What is the marking of the transistor?

                  Comment

                  • nazrul145
                    Badcaps Veteran
                    • Jan 2014
                    • 333
                    • BD

                    #49
                    Re: No 5V found in this Circuit, Please help me.

                    pin4 248k and pin2 80k. when i remove pin 2 resistor 3.3v ok and when remove pin4 resistor 5v ok but when 2 resistor use motherboard 3.3v not come.

                    Comment

                    • Compute
                      Master
                      • Oct 2014
                      • 97
                      • Russia

                      #50
                      Re: No 5V found in this Circuit, Please help me.

                      Originally posted by nazrul145
                      pin4 248k.
                      100k resistor soldered here and check

                      Comment

                      • nazrul145
                        Badcaps Veteran
                        • Jan 2014
                        • 333
                        • BD

                        #51
                        Re: No 5V found in this Circuit, Please help me.

                        Transistor marking 4n34

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                        • nazrul145
                          Badcaps Veteran
                          • Jan 2014
                          • 333
                          • BD

                          #52
                          Re: No 5V found in this Circuit, Please help me.

                          I uses 80k resistor and result same. When i put adapter power up laptop and shutdown after 2-3 second.

                          Comment

                          • Compute
                            Master
                            • Oct 2014
                            • 97
                            • Russia

                            #53
                            Re: No 5V found in this Circuit, Please help me.

                            Originally posted by nazrul145
                            I uses 80k resistor and result same. When i put adapter power up laptop and shutdown after 2-3 second.

                            I do not understand.
                            You've changed the resistor to pin 4 on 278k and put 80k resistor and the result is the same?

                            Comment

                            • Compute
                              Master
                              • Oct 2014
                              • 97
                              • Russia

                              #54
                              Re: No 5V found in this Circuit, Please help me.

                              In the datasheet says that the 2-pin and 4-pin stand at 100k resistors, try to put it to 100k for 2-pin and 4-pin

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                              • nazrul145
                                Badcaps Veteran
                                • Jan 2014
                                • 333
                                • BD

                                #55
                                Re: No 5V found in this Circuit, Please help me.

                                yes same. also pin 4 have 5 so that 3.3v not going to coil.
                                when i remove pin2 resistor 3.3v ok when remove pin4 resistor 5v ok. but when use this two resistor only 5v continue present, but 3v come when adapter pluged in and turn off 2-3 second. that means 5v continue ok but 3v problem.

                                Comment

                                • Compute
                                  Master
                                  • Oct 2014
                                  • 97
                                  • Russia

                                  #56
                                  Re: No 5V found in this Circuit, Please help me.

                                  Originally posted by Compute
                                  In the datasheet says that the 2-pin and 4-pin stand at 100k resistors, try to put it to 100k for 2-pin and 4-pin

                                  Just try to put resistors on 100k, not 80k, 100k is, it's not difficult, way to pin 2 and 4 should be a low level

                                  Comment

                                  • nazrul145
                                    Badcaps Veteran
                                    • Jan 2014
                                    • 333
                                    • BD

                                    #57
                                    Re: No 5V found in this Circuit, Please help me.

                                    i connect 95k resistor to pin2 and 100k pin4 but same.

                                    Comment

                                    • Compute
                                      Master
                                      • Oct 2014
                                      • 97
                                      • Russia

                                      #58
                                      Re: No 5V found in this Circuit, Please help me.

                                      Launch control duty 3 and 5 volts engaged EC, try to flash it flash drive

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                                      • nazrul145
                                        Badcaps Veteran
                                        • Jan 2014
                                        • 333
                                        • BD

                                        #59
                                        Re: No 5V found in this Circuit, Please help me.

                                        reflash bios?

                                        Comment

                                        • Compute
                                          Master
                                          • Oct 2014
                                          • 97
                                          • Russia

                                          #60
                                          Re: No 5V found in this Circuit, Please help me.

                                          Originally posted by nazrul145
                                          reflash bios?
                                          yes

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