macbook pro a1286 no image on internal but ok on external

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • highpulse
    i hate HP
    • May 2013
    • 1488
    • portugal

    #1

    macbook pro a1286 no image on internal but ok on external

    Well this computer was a working one , but we had here another that the board was with damaged connector , my collegue swapped screen assembly between machines , and he fucked up the good board , that was giving image on both internal and external , i noticed that the board was with some burned pins , so i replaced the socket , but still no image on internal !
    the board is a 820-2915-b , so if anyone have this schematic and have certain parts to chek first let me know .

    thk in advance
  • dellxps15
    Badcaps Legend
    • Feb 2014
    • 1588
    • italy

    #2
    Re: macbook pro a1286 no image on internal but ok on external

    here is schematic + board view.

    edit: post good picture of lvds connector zone.
    Attached Files
    Last edited by dellxps15; 02-23-2015, 12:36 PM.

    Comment

    • polytek
      Badcaps Veteran
      • Dec 2013
      • 496
      • TUNISIA

      #3
      Re: macbook pro a1286 no image on internal but ok on external

      Try this
      Attached Files

      Comment

      • highpulse
        i hate HP
        • May 2013
        • 1488
        • portugal

        #4
        Re: macbook pro a1286 no image on internal but ok on external

        for what i notice , on pins 38 39 and 40 i got 0 ,
        i got the enable lcd 2 and 3 pins 3.3 volts
        i heard the chime , but no image , but i notice i slight diference on the screen getting more black the screen .
        will send the photo in a minute

        Comment

        • highpulse
          i hate HP
          • May 2013
          • 1488
          • portugal

          #5
          Re: macbook pro a1286 no image on internal but ok on external

          pins 2 and 3 and 38 39 and 40 are bit merged with the solder , but because of ripped solder mask , but they are in same trace , so no problem , about the outher pins , are all well soldered and making good contact
          Attached Files
          Last edited by highpulse; 02-27-2015, 04:46 AM.

          Comment

          • highpulse
            i hate HP
            • May 2013
            • 1488
            • portugal

            #6
            Re: macbook pro a1286 no image on internal but ok on external

            PPVOUT_S0_LCDBKLT got really 0 even cheking the coil l9701 , 0 volts ,

            Comment

            • dellxps15
              Badcaps Legend
              • Feb 2014
              • 1588
              • italy

              #7
              Re: macbook pro a1286 no image on internal but ok on external

              if u put a light can you see image ?
              without hard drive wait a bit and you should see a folder with a ? in the middle lower part of lcd.

              if yes check backlight little 0402 fuse and backlight ic.

              Comment

              • highpulse
                i hate HP
                • May 2013
                • 1488
                • portugal

                #8
                Re: macbook pro a1286 no image on internal but ok on external

                backlight IC AKA U9701 ?
                litlle bga ?

                Comment

                • highpulse
                  i hate HP
                  • May 2013
                  • 1488
                  • portugal

                  #9
                  Re: macbook pro a1286 no image on internal but ok on external

                  yes there no backlight i got image very deep
                  the ? folder since i dont have hdd here

                  Comment

                  • dellxps15
                    Badcaps Legend
                    • Feb 2014
                    • 1588
                    • italy

                    #10
                    Re: macbook pro a1286 no image on internal but ok on external

                    check first F9700 fuse for continuity, if it works or not. you should have 12.5volt both side.

                    yes u9701 is backlight ic chip. if fuse is ok, check if ic has not burnt.

                    Comment

                    • highpulse
                      i hate HP
                      • May 2013
                      • 1488
                      • portugal

                      #11
                      Re: macbook pro a1286 no image on internal but ok on external

                      well must be that one since i dont have any voltage on the coil that feed the PPVOUT_S0_LCDBKLT

                      before cheked that i got VIN on pin C1pad and also PP3V3_S0 got 3.3 on pad C4, confirmed that voltage on the C9711

                      Comment

                      • highpulse
                        i hate HP
                        • May 2013
                        • 1488
                        • portugal

                        #12
                        Re: macbook pro a1286 no image on internal but ok on external

                        yes was the fuse , i was tring to find this fuse for some good time , and didnt find it , well its always good having some people who are more expert in certain areas thk once again dellxps , 2 apple machine you help me out

                        cheers mate

                        Comment

                        • dellxps15
                          Badcaps Legend
                          • Feb 2014
                          • 1588
                          • italy

                          #13
                          Re: macbook pro a1286 no image on internal but ok on external

                          you welcome. for fuse buy 2A fast blow 0402 25 or 32volt. they are on ebay.

                          Comment

                          • highpulse
                            i hate HP
                            • May 2013
                            • 1488
                            • portugal

                            #14
                            Re: macbook pro a1286 no image on internal but ok on external

                            yeah removed from another board i had here for spares

                            cheers mate

                            Comment

                            • highpulse
                              i hate HP
                              • May 2013
                              • 1488
                              • portugal

                              #15
                              Re: macbook pro a1286 no image on internal but ok on external

                              now im waiting for another socket , and new lvds cable for the outher mac , and then will chek the board to see if the fuse is fucked up as well :__O)

                              Comment

                              • premanpurimas
                                Member
                                • Oct 2016
                                • 12
                                • Indonesia

                                #16
                                Re: macbook pro a1286 no image on internal but ok on external

                                thanks for the schematic and brd

                                Comment

                                • anand797
                                  New Member
                                  • Jan 2015
                                  • 9
                                  • INDIA

                                  #17
                                  Re: macbook pro a1286 no image on internal but ok on external

                                  Thanks guys really helpful post

                                  Comment

                                  • kofe
                                    Member
                                    • Sep 2013
                                    • 32
                                    • Estonia

                                    #18
                                    Re: macbook pro a1286 no image on internal but ok on external

                                    thanks for the schematic

                                    Comment

                                    • danielFAB
                                      Member
                                      • Jul 2016
                                      • 29
                                      • Argentina

                                      #19
                                      Re: macbook pro a1286 no image on internal but ok on external

                                      Thanks!!!!!!!! for the schematic

                                      Comment

                                      • Pascal Komlassan
                                        Badcaps Veteran
                                        • Jan 2017
                                        • 806
                                        • TOGO

                                        #20
                                        Re: macbook pro a1286 no image on internal but ok on external

                                        Originally posted by polytek
                                        Try this
                                        good

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Madoy104
                                          Macbook Pro A1989 - No image, working fine with external monitor
                                          by Madoy104
                                          Hi everyone,


                                          I have a MacBook Pro A1989 that was likely exposed to liquid. It doesn't display an image on the built-in screen, but the screen is backlit (you can't see the Apple logo or any other elements when held up to light). The laptop provides 20V and 1.5-2A, and it works fine when I use it with an external monitor. Currently, the connector for the display (J8500) is disconnected. I'm writing to ask for help in diagnosing the issue. I've heard that when the J8500 is exposed to liquid, the processor pin responsible for the display might short-circuit, and I'd like to know...
                                          08-15-2024, 10:01 AM
                                        • fasda1984
                                          GS66 Stealth 11UE, it start only in external HDMI monitor, Internal display died
                                          by fasda1984
                                          , Hello have same GS66 Stealth 11UE, it start only in external HDMI monitor, Internal display died without crash or something, just started in black screen, checked driver in devices and have only external display, no more internal... Any suggestion? External working fine, no problems no errors
                                          06-22-2024, 01:43 AM
                                        • baglaivlad
                                          MacBook Pro A2289 (820-01987-A) No boot/image, but boots to DFU
                                          by baglaivlad
                                          Hi everyone. Just a reminder I am not a professional repair technician, fixing Apple electronics is my hobby.

                                          Recently got my hands on MacBook Pro A2289 with interesting behavior. Pristine condition, no water damage, no visual issues whatsoever. It has no image, no CapsLock, no life except the fan is spinning. But it is able to boot into DFU and recognized by another MacBook. I tried to revive and restore the laptop, but the process ends when the MacBook usually should show an Apple logo with a progress bar. I assume the main power lines and T2 are working. It seems like the Intel...
                                          01-09-2024, 09:55 PM
                                        • sdogs
                                          macbook pro M1 a2338 no video on internal display PP3V3_S2 short
                                          by sdogs
                                          Greetings to the entire forum, I ask you for help because I'm going crazy. A dear friend of mine gave me a macbook pro M1 A2338 that only works with an external screen. With the internal one, no backlight or image. Only the external display is detected from the system settings.
                                          First I changed the display flat, then I made a backup with time machine and tried a reset in dfu but nothing to do, always the same problem.
                                          I analyzed the logic board, it shows no sign of liquid or visible damage. I then moved on to examine the logic with the thermal camera and found that the UP701 chip was...
                                          06-27-2025, 01:58 PM
                                        • sdogs
                                          macbook pro M1 a2338 no video on internal display PP3V3_S2 short
                                          by sdogs
                                          Greetings to the entire forum, I ask you for help because I'm going crazy. A dear friend of mine gave me a macbook pro M1 A2338 that only works with an external screen. With the internal one, no backlight or image. Only the external display is detected from the system settings.
                                          First I changed the display flat, then I made a backup with time machine and tried a reset in dfu but nothing to do, always the same problem.
                                          I analyzed the logic board, it shows no sign of liquid or visible damage. I then moved on to examine the logic with the thermal camera and found that the UP701 chip was...
                                          06-27-2025, 11:26 AM
                                        • Loading...
                                        • No more items.
                                        Working...