Hướng dẩn sửa main macbook Pro

Discussion in 'Thảo luận khác' started by Luongltn, Jun 4, 2016.

  1. Luongltn

    Luongltn New Member

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    http://forums.macrumors.com/threads/smc-issue-on-mbp-13-hardware-troubleshooting-guide.1122338/
    Impedance of around 10 Ohm on pin L7220-2 is probably normal. With L7220 removed, pin1 should have much higher impedance since it is connected to to the push-pull FETs and feedback pin of U7200. This is well within the loading of 3.3v supply (3.3v/10A = 330mA). In reality the active loading will be more than that but certainly no where near the design limit of 4A. Audible tester cannot really distinguish low resistance value from a short, so that's not a good way to check for shorts except for quick test followed by actual ohmmeter reading. P63C6.png P64B7.png
     
  2. Luongltn

    Luongltn New Member

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