MacBook Pro 13" 2010 G3 Hot 5,3V

Discussion in 'MacBook Pro' started by gerikerschi, Jun 24, 2014.

  1. gerikerschi macrumors newbie

    Joined:
    Jun 24, 2014
    #1
    Hi all!

    My Macbook Pro 13 2010 does not start any more.
    I measured the voltage on G3Hot and I get 5.3V instead of 3.4V.
    The Battery Pins 4 and 5 also have the 5.5V.
    The MacSafe lights green (without accu).
    Can anyone help me to find the problem?
    I am sure, I have a problem on smc circle.

    BR
    Gerald
     
  2. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #2
    All I can recommend is to take it into apple, though it being a 2010 model, is out of warranty. :(
     
  3. gerikerschi thread starter macrumors newbie

    Joined:
    Jun 24, 2014
    #3
    I forgot to write, that the board has a little liquid damage around the Lt3470!
    I cleaned all parts, but no function anymore!
    I read a lot of forum entries, but I can't find such a problem with a too high G3Hot voltage!
     
  4. gerikerschi thread starter macrumors newbie

    Joined:
    Jun 24, 2014
    #4
    Are there any data sheet with the voltages around the Lt3470?
    I am not sure, if the Lt3470 is damaged!
     
  5. cookiesnfooty macrumors 6502

    cookiesnfooty

    Joined:
    Jul 1, 2009
    Location:
    Harrogate
    #5
    What did you clean it with? I spilt juice on mine and it was dead, however spraying with isopropyl alcohol spray and scrubbing it with a tooth brush brought it back to life.
     
  6. gerikerschi thread starter macrumors newbie

    Joined:
    Jun 24, 2014
    #6
    I clean it with sinkers cleaner, sopropyl alcohol and a glass fiber pin.
    Then I have soldered down 2 ic's with hot air, cleaned and soldered up again.
    Now are the short circles away!

    BR
    Gerald
     
  7. gerikerschi thread starter macrumors newbie

    Joined:
    Jun 24, 2014
    #7
    So, I measured the current on the LT3470 chip on my defect Logicboard (MBP 13 2010) and on a good Logicboard (MBP 13 2009)

    current on both boards
    Pin--Type------defect Logicboard----Current good Logicboard
    Pin1 FB--------------2,1V---------------------1,2V
    Pin2 BIAS----------5,42V---------------------3,4V
    Pin3 BOOST--------11,2V---------------------6,8V
    Pin4 SW------------5,42V---------------------3,4V
    Pin5 GND--------------0V-----------------------0V
    Pin6 Vin------------9,78V--------------------10,8V
    Pin7 NC
    Pin8 SHDN---------9,78V--------------------10,8V

    Is the DC-DC converter defect?
     
  8. gerikerschi, Jul 1, 2014
    Last edited: Jul 1, 2014

    gerikerschi thread starter macrumors newbie

    Joined:
    Jun 24, 2014
    #8
    I measured C6994 with 220nF, R6996 with 200k, R6995 with 348k and C6995 with 22pF.
    All values are correct!
    I have one problem.
    The resistor R6995 has 348k in desoldered state.
    In soldered state I got 200k. Is there any parallel resistor or Kerko which one could be defect?
     
  9. gerikerschi thread starter macrumors newbie

    Joined:
    Jun 24, 2014
    #9
    Now I change C6994, C6995, R6996, C6990 and U6990 and I get the same current on G3Hot!?
    What can I do/check at next?
     

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