Please help locate A1278 Logic Board SMD

Discussion in 'MacBook Pro' started by sparkyuiop, Mar 28, 2013.

  1. sparkyuiop macrumors newbie

    Mar 28, 2013
    I wonder if anyone can help identify the missing component from this A1278 logic board?
    I have read other post's on this well informed website but was unable to see clearly in any of the photographs the number of this thing which I believe is a double diode or transistor. In one picture I think I can possibly see 'KHP....' or maybe the K is an 'X', I really can't be sure.
    This board was in a pretty bad way but I think I have recovered it enough to give this a shot if any of you kind folk can help?
    I enclose a picture to show the one I'm referring to.
    Many thanks in advance.

    Phill Thorne.

  2. xinuxnt macrumors newbie

    Jan 10, 2014
    SMD diode or transistor Macbooc pro A1278

    may be it is late but I have your data needed, I have the same board (and I looking for another pick away SMD component) and I found your question. The thing say KNP and vertically Y1 I can`t find what is it but I have the schematic and may be you have more skills to find it.
    Actually I am looking for this SMD diode or transistor component in A1278

  3. peterlundh, Dec 17, 2017
    Last edited: Dec 17, 2017

    peterlundh macrumors newbie

    Oct 6, 2009
    --- Post Merged, Dec 17, 2017 ---
    Hi- Attached is a figure with the back and front of a A1278 (2012) logic-board. Grateful if someone could please help me locate the SMC chip (U4900) and, if possible, the Thermal Sensor (T29). My fan is constantly running flat-out (>6000RPM) but temperature, are fine. Many thanks and a Merry xMas.


    Attached Files:

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