Macbook A2442 820-02098 boot and display issue

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • obelix24
    Badcaps Veteran
    • Jun 2023
    • 291
    • Slovakia

    #21
    I've replaced U5000 with U5000 from M1 (a2338), recreated all missing pads now i don't have hotspot on U5000 and also all readings arround U5000 are fine.

    But Macbook is behaving same (no backlight and only apple logo that bootloops)

    Comment

    • obelix24
      Badcaps Veteran
      • Jun 2023
      • 291
      • Slovakia

      #22
      I was measurring with power connected and i or something shorted U8100 (there is short to ground on PP1V8_S2. After injecting 1V only thing that gets hot is U8100 (there is hotspot)

      Does anyone know if U8100 can be replaced with U8100 from 2020 M1 a2338 (820-02020) ?

      Comment

      • obelix24
        Badcaps Veteran
        • Jun 2023
        • 291
        • Slovakia

        #23
        ok i can;t use U8100 as it's different

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13830
          • Canada

          #24
          No experience with this, yet. What are the topside markings of the original U8100 that was onboard? Post a pic or link to this device.

          Comment

          • obelix24
            Badcaps Veteran
            • Jun 2023
            • 291
            • Slovakia

            #25
            It looks same problem is orientation. On 2020 a2338 is rotated so when i want put it on 2021 m1 pro the dot (first pin) is on different location

            m1 pro (a2442) 820-02098 - U8100
            APL1098 343S0051
            N05FX2LOLM 2227

            m1 (a2338) 820-02020 - U8100
            APL1096 343S00438
            POA4B000LL 2122
            Attached Files
            Last edited by obelix24; 09-17-2024, 10:42 AM.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13830
              • Canada

              #26
              New Original A2337 A2338 APL1096 343S00438 Power Supply Chip IC Chipset - AliExpress 7

              Comment

              • obelix24
                Badcaps Veteran
                • Jun 2023
                • 291
                • Slovakia

                #27
                yes i know it's same dimmensions but orientation and possition of pin 1 differs.

                I will probably need to buy icloud locked board to have donor and comparission

                Comment

                • obelix24
                  Badcaps Veteran
                  • Jun 2023
                  • 291
                  • Slovakia

                  #28
                  ok i finaly got some 16" m1/m2 pro's i've replaced U5100 and it's back to 20V but the problem remains ...

                  No Backlight and when screen is connected (JP600) it also reboots (there is bootloop - only apple logo (without backlight) and reboots)

                  Any idea ? what can cause that when screen is connected (via JP600) there is no backlight and bootloop) but when it's disconnected macbook works fine.
                  Last edited by obelix24; 10-08-2024, 04:59 AM.

                  Comment

                  • obelix24
                    Badcaps Veteran
                    • Jun 2023
                    • 291
                    • Slovakia

                    #29
                    Does anyone have Diode readings from JP600 ? I want to compare if there is something

                    Comment

                    • obelix24
                      Badcaps Veteran
                      • Jun 2023
                      • 291
                      • Slovakia

                      #30
                      ok so it looks like this issue (bootloop + no backlight) is due to backlight issue on display (not on motherboard).

                      same issue :
                      https://www.facebook.com/Logicboard....UKu6sqpSVwqaol

                      Comment

                      • Stephen
                        Meow Meow MEOW!
                        • Apr 2020
                        • 667
                        • United States

                        #31
                        I just did a beautiful replacement on an A2442 LCD and restoring True Tone back with Pro Motion Display. The A2442 LCD was cracked and destroyed but the housing was fine, had to remove the original broken LCD, (ordered a genuine lcd replacement on AliExpress) those lcds due require you swap the two chips to restore True Tone and to make sure those pesky squares do not show up. I did it successfully with ease however the first time I had an issue with the backlight, I discovered that the backlight itself is very prone to failure, I learned that by purchasing another backlight on eBay (a broken A2442 lcd with a good housing and turns on) took off the faulty screen again and then popped in the new screen that already had the chips on. The backlight came back on. There was no mistakes made on that backlight, however it just seems that the backlight cable or the backlight itself could go out. I believe this will be a known flaw in these models over time. Sadly you cannot replace that backlight unless you remove the LCD first. And it is a very very veryyyyyy hard job to do when the LCD is not broken, if it is broken, then you can just remove with easy if you crack it here and there no big deal, but if you are trying to retain the LCD without cracking, you have to remove the rubber seals from the LCD that is underneath the LCD itself. Very very time consuming and risky. Replacing the LCD is the best option, just do not forget the True Tone and the chip that is married to the board. I wish you luck on this repair. It took me a few times to perfect it but its worth it once you figure it out.
                        sigpic
                        MEOWING IN THE IMPOSSIBLE UNIVERSE!

                        Comment

                        • obelix24
                          Badcaps Veteran
                          • Jun 2023
                          • 291
                          • Slovakia

                          #32
                          Only problem is i'm not aboe to find any cracked lcd for this macbook on ebay (in europe)

                          Comment

                          • obelix24
                            Badcaps Veteran
                            • Jun 2023
                            • 291
                            • Slovakia

                            #33
                            ok so I got another a2442 that looks like will be not repairable so I decided to switch the board where I have backlight issues to see if it's really problem on display side ...

                            and to my surprise MacBook started right away fully working not restarting ... BUT there is no backlight ...

                            I've replaced UP800 - still the same

                            I've checked Diode mode readings everywhere I was able to find anything with BKLT in description (everything ok). I've checked all pins JP600 and JP900 if there is any abnormality everything OK.

                            Only thing left from my point of view is to replace UP710 and UP701 (even if all diode reading are ok) because I really don't know what to check

                            I also tried to decrease and increase brightness via F1 and F2 and no difference only difference was when I put it all the way down the screen goes off (as on normal working MacBook)

                            Any idea ? According diode readings I'm comparing it in FlexBV with reading that are available for my board.

                            Comment

                            • obelix24
                              Badcaps Veteran
                              • Jun 2023
                              • 291
                              • Slovakia

                              #34
                              what is the exact name of Backligh power ? is it PPVOUT_LUXE_XW ?

                              Comment

                              • obelix24
                                Badcaps Veteran
                                • Jun 2023
                                • 291
                                • Slovakia

                                #35
                                maybe possible to inject 15V to PPVOUT_LUXE_XW when the MacBook is on to see if the backlight will appear ? (I saw this made Sorin - in Electronics repair school on some laptops)??

                                Comment

                                • obelix24
                                  Badcaps Veteran
                                  • Jun 2023
                                  • 291
                                  • Slovakia

                                  #36
                                  any idea ?

                                  Comment

                                  • obelix24
                                    Badcaps Veteran
                                    • Jun 2023
                                    • 291
                                    • Slovakia

                                    #37
                                    according to repair wiki (https://logi.wiki/index.php/Backlight_Troubleshooting) if you switch display backlight can be off until lid off and on signals are send ...

                                    I've tried with original lid sensor from screen (but still no backlight - it was turning off as keyboard backlight turned off)

                                    i also tried 2 other LID sensors (original one from original screen, new i also tried to program it with nerd.tool1 but still no backlight)

                                    i tried to put board back to original case and still the same issue when screen (all cables are connected there is no backlight and only apple logo bootloop)

                                    so from this i guess there is not problem with LCD but on the board itself ... but where ?

                                    Comment

                                    • obelix24
                                      Badcaps Veteran
                                      • Jun 2023
                                      • 291
                                      • Slovakia

                                      #38
                                      I've checked more arround UP800 and i noticed that on RP830 (pins LUXE_LG2 and LUXE_LG2_R) i'm getting 0V ...
                                      but on RP833 (LUXE_UG2 and LUXE_UG2_R) i'm getting 5V

                                      RP830 is connected to QP803 - i tried to replace it but nothing and diode readings are ok

                                      also on PPVOUT_LUXE_XW i'm getting 0V (when screen is connected)

                                      Comment

                                      • obelix24
                                        Badcaps Veteran
                                        • Jun 2023
                                        • 291
                                        • Slovakia

                                        #39
                                        i'm trying to get to understand schematics for this board (and also overal) As i don't have any voltage on LUXE_LG2 and LUXE_LG2_R does the voltange goes in that way i draw ? So from my basic understanding only things that can be wrong are the 2 (or at least one) mosfet QP803 or QP801 or UP800 (but i don't think this is the problem as i've replaced it 3x and still the same result (i'm using donor boards). Or is there anything alse that can cause there is 0V on LUXE_LG2 and LUXE_LG2_R ????

                                        also if i understand PPVOUT_LUXE_XW is voltage for backlight and it should have 15V and this 15V should be generated by QP801 and QP803 am i correct ?
                                        Attached Files

                                        Comment

                                        Related Topics

                                        Collapse

                                        • rounin
                                          MacBook Air A2337 (820-02016) USB-C Port Issue – Only Works in One Orientation (CC Line Problem?)
                                          by rounin
                                          Hi everyone,

                                          I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.

                                          🛠 Original Issue
                                          The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
                                          Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.

                                          I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.

                                          ⚠️ New Problem: One USB-C Port Only Works in One Orientation...
                                          04-19-2025, 01:18 AM
                                        • dqtech
                                          macbook pro late 2012 A1425 boot issue
                                          by dqtech
                                          this is my first time having this issue...everytime turn on will have this kind of word before apple logo appear....and sometimes just stuck here and have to force shutdown and turn on again....anyone have solution for this?...
                                          12-22-2024, 01:54 AM
                                        • abajor
                                          Alienware Area-51 R2 Boot Loop issue.
                                          by abajor
                                          I have the above mentioned Alien Ware A51 R2, currently it randomly will boot into the OS but more often than not it boot loops, I'm assuming there's an issue with power regulation somewhere.
                                          It comes with Dual 180 Watt Dell PSU, which is ironic since the thing claims it requires 420 watts in the bios screen.

                                          To rule out the power bricks I've attempted to power up the Laptop with a 330W and 240W Dell PSU at the same time, it still has the same boot loop issue so the problem is definitely the laptop.

                                          Right now I'm trying to dig through the PDF schematics and Board...
                                          03-08-2024, 10:08 PM
                                        • No Lan
                                          [Macbook pro A1708] [Boot loop] [Trackpad ?]
                                          by No Lan
                                          Hey everyone,

                                          Usually, I'm not the type to ask for help, but this time, I'm calling on your wisdom and expertise I've seen what this community can do, so I'm pretty sure you guys can help me out.

                                          Here's the deal: I noticed my MacBook got stuck in a boot loop. After opening it up and doing some initial troubleshooting, I found that the boot loop stops only when the trackpad is unplugged.

                                          Now, just so you know, the trackpad actually works — I tested it with another motherboard and it's all good. Same for the cable, no issues there. The problem is only...
                                          05-24-2025, 03:09 PM
                                        • twonk9098
                                          Macbook Pro mid 2015 battery required to boot?
                                          by twonk9098
                                          I have read many forums that state the Macbook Pro 2015 needs / does not need a battery to boot. I'm not convinced as yet which is correct.
                                          The Macbook Pro mid 2015 I have has no battery and do not really want to buy one just to test.
                                          This model has the newer trackpad which is not clickable when turned off.
                                          At the moment, without battery it does turn on with no display (with backlight), no chime and then turns off after 13 seconds. I see this from the power draw on my DTPS.
                                          If I hold the power button whilst connecting the magsafe 2 charger it turns on, again no image but...
                                          12-10-2024, 06:51 PM
                                        • Loading...
                                        • No more items.
                                        Working...