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Samsung np300e5a turn on but no image

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    Samsung np300e5a turn on but no image

    Hello my friends, I need your help again. I am trying to repair a samsung np300e5a, which turns on but no picture appears and the fan runs at full speed, sometimes it turns on and everything is ok. in 10 times 1/2 works.
    I just got a one schematic here in the forum and I'm not sure is correct for this model, and I do not have the boardview of this board, which makes it difficult to identify any component.

    I notice also that the 1912a mosfet with 1.060v heats up a lot, And the coil next to it also heats, it replaces it with new and stays the same.

    3.3v ok
    5v ok
    19v ok

    MODEL: SCALA3-15 / PETRONAS-15 REV 1.5
    BA92-09186A

    thank you
    Attached Files

    #2
    Re: Samsung np300e5a turn on but no image

    clean ME region bios..
    Due to a lack of donations, server free space at a critical level, and possible closure of Bios Requests all donations are welcome, click:

    >>>>> https://www.badcaps.net/index.php?pageid=donate1 <<<<<

    Every donation made will go towards server fees and maintenance costs.

    Comment


      #3
      Re: Samsung np300e5a turn on but no image

      Originally posted by peste View Post
      clean ME region bios..
      I never did and I do not know how to do it, I'll see how it's done and I'll try. thank you

      Comment


        #4
        Re: Samsung np300e5a turn on but no image

        news: the mosfet 1912a not heat without cpu, and have the 1.050v and gpu not heat anything. the coil next to the gpu makes short with multimeter to the gnd and 0v. its normal?
        Attached Files

        Comment


          #5
          Re: Samsung np300e5a turn on but no image

          Please define make short, in ohms.
          1.05V is probably pch power supply line.
          If machine boots then everything is fine, usb and so on?

          Comment


            #6
            Re: Samsung np300e5a turn on but no image

            Originally posted by khaahk View Post
            Please define make short, in ohms.
            1.05V is probably pch power supply line.
            If machine boots then everything is fine, usb and so on?
            the pc does not boot, just turn on, sometimes it was all good, but the turn off did not start any more, I did a scheme with a photo to realize how it is. as I do not have the boardview of this board I can not identify the components. someone has?
            Attached Files

            Comment


              #7
              Re: Samsung np300e5a turn on but no image

              Originally posted by jp_jota View Post
              the pc does not boot, just turn on, sometimes it was all good, but the turn off did not start any more, I did a scheme with a photo to realize how it is. as I do not have the boardview of this board I can not identify the components. someone has?
              edit. with back photo
              Attached Files

              Comment


                #8
                Re: Samsung np300e5a turn on but no image

                4 ohm on video card and 13 ohms on cpu vcore are fine. The one that stands up is 0.64 ohms on PCH power line. Try to measure resistance without the coil to see on what side the low ohms reading is.

                Comment


                  #9
                  Re: Samsung np300e5a turn on but no image

                  in the position as it is in the picture taken. the left side that goes to the condensor has 00.68 ohms and the right side that comes from the mosfet has 5.760mohms but the value is always going down

                  Comment


                    #10
                    Re: Samsung np300e5a turn on but no image

                    On the Schematic page 47 you have the Switch power 3.3V 5.5V 1.5V test those Fets
                    Last edited by Techtiger; 05-24-2019, 10:00 AM.

                    Comment


                      #11
                      Re: Samsung np300e5a turn on but no image

                      thanks for the help. but i think this schematic is not for this model, i only can find the 0803gmt and 6912a mosfets.
                      Attached Files

                      Comment


                        #12
                        Re: Samsung np300e5a turn on but no image

                        Not those Fets try this one in Pic
                        Attached Files

                        Comment


                          #13
                          Re: Samsung np300e5a turn on but no image

                          Originally posted by techtiger View Post
                          Not those Fets try this one in Pic
                          ok, i will test now. and i find the real model of this board. its a BA41-01839A

                          Comment


                            #14
                            Re: Samsung np300e5a turn on but no image

                            Originally posted by techtiger View Post
                            Not those Fets try this one in Pic
                            i edit a photo with voltage
                            Attached Files

                            Comment


                              #15
                              Re: Samsung np300e5a turn on but no image

                              That Voltage is correct ok now Check SIO U512 MEC pin 49 40 4 35 32 61 42 43 75 34 65 103 101 90 85

                              Comment


                                #16
                                Re: Samsung np300e5a turn on but no image

                                The voltage is:
                                49 - 3.3v
                                40 - 3.3v
                                4 - 3.3v
                                35 - 0V after resistor its 5v
                                32 - 5v
                                61 - 0,970 oscillating
                                42 - 0v
                                43 - 0v
                                75 - 3.3v
                                34 -3.3v
                                65 - 3.5v
                                103 - 3.3v
                                101 - 3.3v
                                90 - 0v
                                85 - 0v
                                I used this boardview to get this results
                                Attached Files
                                Last edited by jp_jota; 05-27-2019, 05:12 AM.

                                Comment


                                  #17
                                  Re: Samsung np300e5a turn on but no image

                                  all input Voltages for SIO U19 are Good, SIO commination with BIOS OK up to RSMRST but the PCH is not responding for SIO wake up signal , check if your PCH getting worm ? check with the Boardview PCH getting P3.3V near the caps & resisters (boardview Nets type P3.3V / P1.05V you will find them all ) check R252 for 3.3V both sides? Check PRTC BAT for any short on bios Batt? Test R160 with the multimeter without power, test pin 90, 43, 42 of U19 as you press the power button for any voltage one by one (# = high low), try and heat up the PCH with the hot are gun, find out if the Mob getting P12.0V_ALW also

                                  Comment


                                    #18
                                    Re: Samsung np300e5a turn on but no image

                                    ok, i will see and i post, but in the case of the 12v_ALW i only have 9V and i can not find were is the 12V_ALW is created.
                                    Attached Files

                                    Comment


                                      #19
                                      Re: Samsung np300e5a turn on but no image

                                      R252 have 3.3v and in side gnd 0V. all 3.3V for pch is ok. prtc_bat not have short and have 2.9V.
                                      R160 have 5V and from side the U11 is 0V and with multimeter without power have 10Komhs
                                      i will check pins now
                                      Attached Files

                                      Comment


                                        #20
                                        Re: Samsung np300e5a turn on but no image

                                        the pins 90, 43 and 42 its 0V and its make a impulse when i press the on/off but i canĀ“t see how much voltage.

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