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Desperately want to fix my dead for 4 year laptops please help

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    Desperately want to fix my dead for 4 year laptops please help

    Hi guys
    i have few laptops which are dead oldest one is 4 years since death and recent one is 1 year all of them died suddenly.

    (edit) They just died no charging no light no power on just dead

    i do mobile repairs and replace visually broken parts so i have no great knowledge on how to check which part is dead in my laptop motherboard
    i'll upload schematic and laptop board picture and please help me fix.
    I've been trying to fix them for past 2 months but no luck.

    Laptop 1 year : Sony Vaio VPCEG3AEN
    Motherboard model : MBX-250

    Laptop 4 years : Asus K56cm
    Motherboard model : K56CM

    Schematic for sony mbx-250
    Schematic for asus k56cm


    here are some pictures of the boards them self

    Blue one is sony and Green one is Asus

    This is asus












    now the sony now















    Thanks alot for reading would really appreciate any help
    Attached Files
    Last edited by thermometer; 05-27-2020, 03:14 PM. Reason: less description of problem

    #2
    Re: Desperately want to fix my dead for 4 year laptops please help

    Please be a little bit more descriptive of what the problem is with both of them
    9 PC LCD Monitor
    6 LCD Flat Screen TV
    30 Desk Top Switching Power Supply
    10 Battery Charger Switching Power Supply for Power Tool
    6 18v Lithium Battery Power Boards for Tool Battery Packs
    1 XBox 360 Switching Power Supply and M Board
    25 Servo Drives 220/460 3 Phase
    6 De-soldering Station Switching Power Supply 1 Power Supply
    1 Dell Mother Board
    15 Computer Power Supply
    1 HP Printer Supply & Control Board * lighting finished it *


    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
    2 Hem Saw Computer Stack Board

    All of these had CAPs POOF
    All of the mosfet that are taken out by bad caps

    Comment


      #3
      Re: Desperately want to fix my dead for 4 year laptops please help

      Originally posted by sam_sam_sam View Post
      Please be a little bit more descriptive of what the problem is with both of them
      they just stopped working no charging no light no power etc just dead

      Comment


        #4
        Re: Desperately want to fix my dead for 4 year laptops please help

        Anyone help

        Comment


          #5
          Re: Desperately want to fix my dead for 4 year laptops please help

          You said you`ve been trying to repair them for the past 2 months,so list what you`ve tried. Have you checked both chargers,are you using a bench supply.Have you checked both power jacks, inspected both boards thoroughly with a magnifier or microscope for burnt/corroded parts. Does either board have power, have you tested the DC-IN mosfets , tried flashing the bios, do the LED`s light up or flash,are any parts heating up as soon as you connect power, tried different RAM, CPU`s ,Checked CMOS battery voltage ???.

          .
          Last edited by SMDFlea; 05-30-2020, 02:25 PM.
          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

          Comment


            #6
            Re: Desperately want to fix my dead for 4 year laptops please help

            Originally posted by thermometer View Post
            they just stopped working no charging no light no power etc just dead
            If you don't have a charging light then, you have a missing 3.3v power rail.

            Comment

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