toshiba satellite p755-s5295

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  • mazloum
    Badcaps Veteran
    • Sep 2012
    • 499
    • Lebanon

    #1

    toshiba satellite p755-s5295

    phqaa la-6832p rev: 2.0
    hi
    the customer was replacing broken screen with battery on, now the laptop has no display on the screen of the laptop, but it displays every thing good on external monitor...
    i changed Q1 with no success
    Attached Files
  • mazloum
    Badcaps Veteran
    • Sep 2012
    • 499
    • Lebanon

    #2
    Re: toshiba satellite p755-s5295

    can i just insert 3.3v on lcd_vdd for test?

    Comment

    • Sephir0th
      Badcaps Legend
      • Oct 2020
      • 1262
      • Germany

      #3
      Re: toshiba satellite p755-s5295

      You checked R107 is fine? Ohms Reading of this rail?
      FairRepair on YouTube

      Comment

      • mazloum
        Badcaps Veteran
        • Sep 2012
        • 499
        • Lebanon

        #4
        Re: toshiba satellite p755-s5295

        yes, r107 is 150 ohm

        Comment

        • Sephir0th
          Badcaps Legend
          • Oct 2020
          • 1262
          • Germany

          #5
          Re: toshiba satellite p755-s5295

          Show Pic(s) of the LCD-connector and also Share Résistance to GND of +LCD_VDD Rail.
          FairRepair on YouTube

          Comment

          • mazloum
            Badcaps Veteran
            • Sep 2012
            • 499
            • Lebanon

            #6
            Re: toshiba satellite p755-s5295

            Résistance to GND of +LCD_VDD is 296 ohm
            Attached Files
            Last edited by mazloum; 05-22-2021, 11:24 AM.

            Comment

            • mazloum
              Badcaps Veteran
              • Sep 2012
              • 499
              • Lebanon

              #7
              Re: toshiba satellite p755-s5295

              any one?

              Comment

              • Sametbey
                Badcaps Veteran
                • Jan 2021
                • 229
                • Turkey

                #8
                Re: toshiba satellite p755-s5295

                Check the Q17 LCD_VDD transistor in the second picture first. When ENVDD 3v arrives ( Q1A-B ), Q17 G pin will be 0.6v, P_chanal mosfet will transmit.
                Last edited by Sametbey; 05-23-2021, 02:59 AM.
                I'm not happy to be so strong. because it's not humanly

                Comment

                • mazloum
                  Badcaps Veteran
                  • Sep 2012
                  • 499
                  • Lebanon

                  #9
                  Re: toshiba satellite p755-s5295

                  i have 2v on gate of Q17
                  3v on D
                  and 3v on s

                  Comment

                  • Sametbey
                    Badcaps Veteran
                    • Jan 2021
                    • 229
                    • Turkey

                    #10
                    Re: toshiba satellite p755-s5295

                    In the first picture, you have written LCD_VDD missing. Q17 supplies LCD_VDD voltage to the LVDS socket.
                    Q17 D pin has 3.3v? it should go to the LVDS socket if there is one.
                    Last edited by Sametbey; 05-23-2021, 03:21 AM.
                    I'm not happy to be so strong. because it's not humanly

                    Comment

                    • mazloum
                      Badcaps Veteran
                      • Sep 2012
                      • 499
                      • Lebanon

                      #11
                      Re: toshiba satellite p755-s5295

                      this is the problem....
                      pin 6 voltage on Q1 is missing

                      Comment

                      • Sephir0th
                        Badcaps Legend
                        • Oct 2020
                        • 1262
                        • Germany

                        #12
                        Re: toshiba satellite p755-s5295

                        You don't Understand. Q1 Pin6 and Q17 Pin1 ist the Same Rail! So your shared measurements are wrong!

                        Double Check!
                        FairRepair on YouTube

                        Comment

                        • Sametbey
                          Badcaps Veteran
                          • Jan 2021
                          • 229
                          • Turkey

                          #13
                          Re: toshiba satellite p755-s5295

                          Measure starting from ENBVDD. 1 position, 2 positions
                          Attached Files
                          I'm not happy to be so strong. because it's not humanly

                          Comment

                          • mazloum
                            Badcaps Veteran
                            • Sep 2012
                            • 499
                            • Lebanon

                            #14
                            Re: toshiba satellite p755-s5295

                            Originally posted by Sephir0th
                            You don't Understand. Q1 Pin6 and Q17 Pin1 ist the Same Rail! So your shared measurements are wrong!

                            Double Check!
                            i will try

                            Comment

                            • mazloum
                              Badcaps Veteran
                              • Sep 2012
                              • 499
                              • Lebanon

                              #15
                              Re: toshiba satellite p755-s5295

                              ok i have all volts now, but no display...
                              i changed the lcd cable also , with no success

                              Comment

                              • Sametbey
                                Badcaps Veteran
                                • Jan 2021
                                • 229
                                • Turkey

                                #16
                                Re: toshiba satellite p755-s5295

                                Do you have + 3VS and LCD_VDD voltages for the Panel ? 6 and 8 pins exchange data between the LCd panel and the PCH. For panel detection. check the signal backwards. and 10 pin LEDPWM need to be 12 pin BKOFF 3,3 v. maybe panel.
                                Last edited by Sametbey; 05-23-2021, 07:03 AM.
                                I'm not happy to be so strong. because it's not humanly

                                Comment

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