Samsung R428 BA41-01214A IC 3v 5v nóng

Discussion in 'Computer Hardware Repair' started by technical, Jan 14, 2015.

  1. technical

    technical Moderator Staff Member

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    Cấp nguồn dòng ăn khỏng 0.22 IC 51125 nóng bỏng tay.
    Qua đó đạc thấy chân số 8 IC 51125 sụt áp còn hơn 1v.

    P3.3V_MiCOM.

    Dò kiểm tra tổng trở các chân của D517 thấy chân số 3 sọc mass còn khoảng 3ohm.
    diot D517.JPG
    D517.
    Xả bỏ tụ C74 đo lại thấy hết sọc, cấp nguồn dòng ăn 0.03 đèn LED sáng kích nguồn ok máy chạy. :D
    pc74.
     
    #1 technical, Jan 14, 2015
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  2. technical

    technical Moderator Staff Member

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    #2 technical, Jan 15, 2015
  3. lxlx4430

    lxlx4430 New Member

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    thxxxxxxxxxxxxxxxxxxxxxxxx
     
    #3 lxlx4430, Apr 13, 2015
  4. okia123

    okia123 New Member

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    chạm cấp trước còn dễ dò, chứ cấp sau thì khó hơn
     
    #4 okia123, May 2, 2015
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