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  1. iganas

    macbook 820-2849-A problem no video black screen no backlight

    Good Saturday everyone, I have exact same board with seemingly same issue. No internal video nor backlight, boots, chimes, loads into OSX. External video works fine. Tried different LCD cables and different LCDs. LCD_PWR_EN = 0.0V Did anyone figure this one out yet?
  2. iganas

    820-00840 no output sound, device detected

    Replaced the main audio chip (U6200) and speaker sound has returned!
  3. iganas

    820-00840 no output sound, device detected

    Greetings, I have this board that has no output from the speakers, however it detects the output device, as well as plays from headphone jack, and recognizes mic input. It is switching back and forth without issues to speakers/headphones when unplugging the jack. Tried replacement speakers - no...
  4. iganas

    16" A2141 battery issues

    You're right, I borrowed the 96W just today, and it turned on. However battery stays at 1% and is not charging. Never seen this on any other semi-new MacBook
  5. iganas

    16" A2141 battery issues

    Just to clarify, the macbook is in pristine condition, no liquid nor physical damage, barely used
  6. iganas

    16" A2141 battery issues

    So there seems to be a common issue with brand new A2141 16" MacBooks that were opened only once and then placed into storage for 4-6 months, only to find out later that the battery is completely dead and the only fix is to RMA or replace the battery. Some people claim to have received their...
  7. iganas

    820-01987, does not boot, 20v 70mA

    Resistance to ground is 5-30Ω on all the CPU coils and 62Ω at L7702. The board is no longer bootlooping after failed DFU attempts
  8. iganas

    820-01987, does not boot, 20v 70mA

    Hey there :) I got this board with no liquid spill or any other signs, no knocked off components. Initially it used to start with 20v 150-300mA, staying for a few seconds and then bootlooping. I tried DFU mode, which it successfully enters, however it failed every single attempt to recover...
  9. iganas

    820-00923 SSD issue and no internal display

    https://boards.rossmanngroup.com/threads/820-00923-macbook-pro-touch-bar-question-mark-folder.60375/#post-68248 I'm getting the same issue of non-responsive keyboard as mccafe had. Cannot perform resets nor hold Alt for boot selection. USB key doesn't flash not even once during boot, nor when...
  10. iganas

    820-00923 SSD issue and no internal display

    That's great!. With the cap on, all these voltages are on point for the first 2 minutes before the screen boots up: PP1V8_SSD_COLD PP0V9_SSD_FIXED PP1V2_SSD_HOT PP1V8_SSD_HOT PP1V2_SSD_COLD PP0V9_SSD_REG However once the folder icon appears, they all drop to 0v. What could that indicate?
  11. iganas

    820-00923 - MacBook Pro Touch Bar Question Mark Folder

    Already did, and it's not working out ;)
  12. iganas

    820-00923 SSD issue and no internal display

    Does the cap need to be present for it to function/enable power to the SSD? I believe someone before me has removed it. The connector itself looks intact
  13. iganas

    820-00923 - MacBook Pro Touch Bar Question Mark Folder

    Hi, I got a nearly identical issue, question mark folder, keyboard not responding neither for boot selector nor PRAM, same motherboard, same missing voltages. Did you resolve it with U9300 replacement?
  14. iganas

    820-00923 SSD issue and no internal display

    J9600 looks clean. Just noticed that PP3V3_S5_SSD is at 0.76v. Does that point to U9300 Piccolo chip?
  15. iganas

    820-00923 SSD issue and no internal display

    Do my SSD rails' diode readings give any hints at what to measure next?
  16. iganas

    820-00923 SSD issue and no internal display

    What voltages should I expect on the probe points? I am aware these are two different problems. Do the diode readings give any hints at what to measure next? Any reason to suspect U8600?
  17. iganas

    820-00923 SSD issue and no internal display

    Can eDP signals be measured with no screen attached? And what should I measure against? PP1V8_SSD_COLD - 0.6 PP0V9_SSD_FIXED - 0.9 PP1V2_SSD_HOT - 0.9 PP1V8_SSD_HOT - 1.1 PP1V2_SSD_COLD - 0.7 PP0V9_SSD_REG - 0.15
  18. iganas

    820-00923 SSD issue and no internal display

    Hi, new here! Got a A1706 board that had minor liquid spill by the display connector on the screen side, as well as around BIOS chip. After a new display cable and touch-up of suspicious components, the symptoms are as follows: - No internal display with known good screen, external display...
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