Kinh nghiệm BQ25A - BQ24725 khóa nguồn 19V AC_BAT_SYS

Discussion in 'Computer Hardware Repair' started by phovang146, Aug 20, 2016.

  1. phovang146

    phovang146 Well-Known Member

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    Mainboard X451CA mạch mở nguồn AC_BAT_SYS dùng BQ25A; đo tại PR8806 mất nguồn ra 19V AC_BAT_SYS
    Đo thực tế ic sạc BQ25A: 20 =19v; 4 ACDRV = 0v; 5 ACOK = 0v; 6 ACDET = 3,3v.
    Đúng ra chân 6 ACDET = 2.6v do phân áp từ 19V qua PR8814 127KOhm và PR8815 20KOhm.
    Đo thực tế PR8814 trở tăng lên 128.5KOhm;
    Thay trở 127KOhm đã có nguồn 19V. X451CA.
     
    #1 phovang146, Aug 20, 2016
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  2. anhphuong

    anhphuong Well-Known Member

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    a co file bios x451ca rev 2.1 cho em xin voi
     
    #2 anhphuong, May 9, 2017
  3. technical

    technical Moderator Staff Member

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    #3 technical, May 9, 2017
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