Chia sẻ Pan Dell Latitude E6430 I7 Ivy mất nguồn CPU Dòng 0.55A

Discussion in 'DELL' started by cpnetwork, Sep 7, 2015.

  1. cpnetwork

    cpnetwork New Member

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    - Nhận máy trong tình trạng nguyên zin còn tem FPT
    - Tiến hành rã máy lấy main xem coi có vô nước hay chạm chập gì chưa ( chưa cắm nguồn liền )
    - Thấy main nguyên bản không vô nước , và đo tổng trở mainboard thấy không chạm chập
    - Tiến hành cắm nguồn thử thì thấy dòng 0.55A ( main có vga rời , chưa vội đụng chip ) tiến hành đo sơ nguồn , thấy mất nguồn CPU , mất luôn VCCSA 1.5V
    - Đo sơ thấy tại Q58 có đủ 3.3v - 16.5v thứ cấp
    - Tiến hành đo tiếp tại Q30 thấy mất 16.5v => chân 4 mất luôn 5v ( Vì Q30 muốn dẫn tại chân số 3 thì Q31 phải ENA lệnh 3.3v cho Q30 dẫn )
    - Đo sơ Q31 và Q30 không chạm chập
    - Xem sơ đồ thấy lệnh mở cho Q31 dẫn đi từ chân B7 IO ECE5048-LZY mất ( IO chưa có bán )
    - Tiến hành loại bỏ Q31 , câu từ chân số 3 ( 16.5v ) tại Q58 qua chân số 3 Q30 để giả nguồn 16.5v cho chân số 4 Q30 mở
    - Cắm nguồn thấy dòng 1.25a ( chưa cắm ram ) đo tại nguồn CPU đã có 1.1v , đo tại cuộn dây nguồn VCCSA có 1.5v , cắm ram vào dòng có dao động và boot lên 1.56A lên hình
    - Tay nghề còn yếu kém có gì không phải mong ACE bỏ qua và chỉ dẫn thêm !
     

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    Lamha, hd6870 and Admin like this.
  2. Admin

    Admin Administrator

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    một pan rất hay, cảm ơn bạn + 50P
     
    hd6870 likes this.
  3. nguyendo_yen

    nguyendo_yen Active Member

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    quas hay
     
  4. nguyenkhacha5

    nguyenkhacha5 Moderator

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    thanks bài viết
     
  5. nguyenvandainb

    nguyenvandainb Member

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    tks bài viết
     
  6. av computer

    av computer Moderator

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    sao vccsa cao thế. nps khoảng 1.2v đổ lại
     
  7. Admin

    Admin Administrator

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    VccSA (system Agent) Thường ~0,9V
     
  8. cpnetwork

    cpnetwork New Member

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    Em đo nó là 1.401v đúng đó a Tiến !
    Có thể do chạy I7 thế hệ 3 nên nguồn điện lên cao để đáp ứng nhu cầu CPU !
     
  9. mohamed said

    mohamed said Active Member

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    goood work keep
     
  10. Tam Hoang

    Tam Hoang Member

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    thank , rất hay
     
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