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  1. I

    MacBook Pro 13" A1502 820-4924 liquid damage not turning on

    Laptop fixed, U1950 was faulty. Thanks for any help.
  2. I

    MacBook Pro 13" A1502 820-4924 liquid damage not turning on

    Hi, We got a mentioned MacBook with was liquid damaged. Liquid damage was around Q8175, Q6060, u5870 I cleaned up board and fixed broken traces around Q8175 CPU_VCCST_PWRGD present 1.02V Rail 3,34V present PPbus_S5_hscomputing present 11.8V cpuvr_phase1 = 1.86v cpuvr_phase2 = 1.86v L7630 voltage...
  3. I

    820-00045 a1534 wont turn on at all, not water damaged

    U7400 replaced no changes after this too looks like PCH is faulty I'd say
  4. I

    820-00045 a1534 wont turn on at all, not water damaged

    I will try swap from donor board U 7400
  5. I

    820-00045 a1534 wont turn on at all, not water damaged

    PCH heated up no changes, I checked those PM_PWRBTN_L 3V3_S5 no changes on those lines after heating up too
  6. I

    820-00045 a1534 wont turn on at all, not water damaged

    yes PM_PWRBTN_L have no changes I checked once more AVREF_SMC = 3v
  7. I

    820-00045 a1534 wont turn on at all, not water damaged

    resistor removed still no changes on PM_PWRBTN_L 3V3_S5 is still on 0.5v level no changes
  8. I

    820-2327 A1278 2008 no backlight and picture

    R9723 1.2M ohm resistor was corroded, the voltage divider did not work, i dont have the same donor board, so i found a 1M resistor, not 1.2M, now there is backlight and picture, but i think only every second LED is on in the backlight so the bottom of the screen has those patches of dark ...
  9. I

    820-00045 a1534 wont turn on at all, not water damaged

    resistance on L7560 455 ohm double checked PM_SLP_S5_L = 0V I checked on TP first but looks like board view is a bit different than the actual main board and test point wasn't for this signal
  10. I

    820-00045 a1534 wont turn on at all, not water damaged

    I check voltages that you said 3V3_S5 = 0.5v no pulses PM_SLP_SUS_L 0 = 0v no pules PM_SLP_S5_L = 3v3 no pulses PM_RSMRST_L = 0 no pulses SMC_ONOFF_L = 3v26 going down to 0.3v when power button pressed PM_PWRBTN_L = 1.22v no changes when pressing power button
  11. I

    820-00045 a1534 wont turn on at all, not water damaged

    I put back U7100 from donor board PPBUS_G3H is back to normal 8.6V laptop still doesn't turn on. PP5V_S0 =0V PP5v1_s4w = 0V P5VOUT_EN = 0V PP3V3_G3H present I reflow SMC but no changes.
  12. I

    820-00045 a1534 wont turn on at all, not water damaged

    Problem is that the laptop is not taking charge no current taken, on old or new ic, so SMC is not talks witch charger and this U7100 is responsible for a charging as I can see on schematic
  13. I

    820-00045 a1534 wont turn on at all, not water damaged

    Because is easier to measure both board sides with power supply, would I will getting not right measurements with power supply ? I replace ic to try maybe it will resolved issue, this was common issue so I tried replace it. I didn't measure anything more so far.
  14. I

    820-00045 a1534 wont turn on at all, not water damaged

    I have connected power supply to battery connector. Should I put back U7100 ? I have another donor board with have faulty CPU, well CPU only is heating up.
  15. I

    820-00045 a1534 wont turn on at all, not water damaged

    Yes PPBUS_G3H present on F7140 I measured 8.05V
  16. I

    iphone 8 schematics and board view?

    anyone has it?
  17. I

    A1534 usb accessories disabled

    well, customer accepted without usb comm, he did not want to risk
  18. I

    820-00045 a1534 wont turn on at all, not water damaged

    I came back finally to this one no shorts on any rails PP5V_S0 = 0V line is not shorted to GND led is glowing a bit but laptop didn't take any current/charge, and doesn't turn on connected to power supply on battery connectors takes 0,10A nothing heating up. U7100 replaced u4700 replaced...
  19. I

    820-2327 A1278 2008 no backlight and picture

    yes, before there was no picture and no backlight, now there is picture and no backlight, the original lcd cable had corrosion or burn on the 2 pins where the lcd main power goes in, i think the original screen backlight is shorted also i dunno, do u see something on the picture i uploaded? i...
  20. I

    iMac 27" A1419 820-00134-A not turning on

    the short is still on this rail, if its not 12V any idea what rail is this ?
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