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  1. 2informaticos

    Mac A1419 Not turning on. No LED Blinking.

    With 1V (no more than 1.2V) a good IR camera may help you.
  2. 2informaticos

    A2289 820-01987-A water demage

    I don't understand what you are doing. I mentioned you big difference between I2C_PWR_SCL/SDA_R1 lines; pins 1 & 4 of Q6950. U7000, U7800 and U3900 are all connected there; look at page 47.
  3. 2informaticos

    820-00165 SSD

    Clean J3700's contacts. Check all its traces to adjacent components. Just in case, bypass L3700 with a wire jumper. Be sure none of C371x capacitors is ripped off. Also check R3701/2. If all good, try heating PCH.
  4. 2informaticos

    Mac A1419 Not turning on. No LED Blinking.

    What is exact resistance to ground?
  5. 2informaticos

    A1989 820-00850 no power

    What is PPBUS_G3H voltage, w/ and w/o battery connected? Check resistance over C7020/23 (ohm scale). Be sure Q7065 isn't shorted D-S.
  6. 2informaticos

    820-02100 intermittent or slow charging

    Any fault history available?
  7. 2informaticos

    M3 A3114 MacBook Air 15" Very Strange Port Behavior

    Check 1V8_UPC_LDO on each chip, when the power is connected to corresponding port.
  8. 2informaticos

    820-02100 intermittent or slow charging

    Same behavior with Magsafe connector?
  9. 2informaticos

    A1989 820-00850 no power

    Did you connect battery data cable in correct way?
  10. 2informaticos

    A1706 820-00239-A No LED External Only / No SSD

    Low enough to use voltage injection method. Start with 1V, no more than 4V.
  11. 2informaticos

    A1989 820-00850 no power

    Check traces between JB500 and UB300. Also check diode mode to ground on CC1/2 lines.
  12. 2informaticos

    820-00840 no charging

    Machine still not turning on with charger alone?
  13. 2informaticos

    M3 A3114 MacBook Air 15" Very Strange Port Behavior

    PP1V8_UPC5_LDO is generated by U5500 for internal use. It must appear when the Magsafe is connected. Each port controller chip should generate 1.8/3.3V LDO when gets power.
  14. 2informaticos

    A1989 820-00850 no power

    Did you get 0V on mentioned points with charger connected to UB300's port?
  15. 2informaticos

    M3 A3114 MacBook Air 15" Very Strange Port Behavior

    What is the schematic used?
  16. 2informaticos

    820-00165 SSD

    Is SSD_SR_EN_L same as good board? Check J3700 contacts. Just in case, replace U3710/1.
  17. 2informaticos

    820-00840 no charging

    "smc_rst_in- 3,45v ............... 4-0v" What is real reading???
  18. 2informaticos

    820-01598 stop working

    "usbc_xa_cc1- 491 usbc_xa_cc2- 570" Too big difference there! The first suspects are DZ3302 and U3100. Low chance of C3113 leakage.
  19. 2informaticos

    A2289 820-01987-A water demage

    https://openboarddata.org/?a=showboardsolutions&bpath=laptops/apple/820-01987
  20. 2informaticos

    A1706 820-00239-A No LED External Only / No SSD

    "PP3V3_S4 Pin 6 - 0.19V" Check it in diode mode.
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