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  1. 2informaticos

    820-00165 Backlight/Image Issue

    DP_INT_HPD must go high at same time; if LCD is connected, of course. Be sure R8360 is good.
  2. 2informaticos

    820-02020 don't switch off lcd when closed

    Check the traces to UR200; if both inputs are low (0V), output must go low too.
  3. 2informaticos

    MB AIR A2179 No Boot

    First of all, welcome to the forum! Any history available? What said the customer about the failure appearance? Which big coils get voltage?
  4. 2informaticos

    Macbook A2485 Drawing 5V No Amps

    If has the same pinout, you can try...
  5. 2informaticos

    820-3115-B No Boot

    Which big coils get voltage?
  6. 2informaticos

    820-3115-B No Power

    Post U5010 voltages.
  7. 2informaticos

    820-2879 works on battery but not on adapter

    What about PPBUS_G3H and 3V42_G3H voltages, with fake charger?
  8. 2informaticos

    820-3115-B board only works on SMC bypass mode

    Be sure R7402/3 have correct ohm values. Also check their solders and traces. Check SMC_DCIN/PBUS_VSENSE levels, as SMC_DCIN/BMON_ISENSE too.
  9. 2informaticos

    820-2523 boots but no image

    It is very likely GPU issue...
  10. 2informaticos

    820-3115-B No Power

    What about 3V42_G3H?
  11. 2informaticos

    820-2879 works on battery but not on adapter

    You can't connect power directly on the board. SMC requires One-Wire connection! I told you to use a spare Magsafe 1 cable; even 45W is good enough.
  12. 2informaticos

    Diagnosing 2012 13' Unibody Pro

    CPU coils on these boards have very low resistance to ground. But not only short means bad CPU. It may have various internal failures...
  13. 2informaticos

    820-3115-B No Boot

    What about CPU core voltage? Also check PLT_RESET_L level.
  14. 2informaticos

    820-2879 works on battery but not on adapter

    Original charger has an embedded processor. If detects any leakage on the Mac's mainboard, will stop to deliver output voltage. That's the reason I told you to test with fake charger; that one is not so "smart".
  15. 2informaticos

    820-01814 no image

    Did you try known good working LCD assembly? Check diode mode to ground at pins 1 & 3 of J8500.
  16. 2informaticos

    Diagnosing 2012 13' Unibody Pro

    Please open separate thread with each board. Their failures have probably different solutions.
  17. 2informaticos

    820-02536 no 20v

    Original chip didn't get 3V8_AON at all; so is probably bad. Check diode mode to ground on all secondary power lines.
  18. 2informaticos

    Macbook A2485 Drawing 5V No Amps

    Compare diode mode readings on PPBUS_AON with secondary power rails derived from it. I mean 3V8_AON, 3V3/5V_S2, etc...
  19. 2informaticos

    820-2879 works on battery but not on adapter

    Any history available? Did you try known good DCIN board? Test with fake (chinese) charger, or lab PSU and Magsafe 1 cable.
  20. 2informaticos

    820-00165 Backlight/Image Issue

    No pulse on any of them in the first seconds (when chimes)?
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