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Repairs Acer Aspire 5740_5340 MS2286

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    Repairs Acer Aspire 5740_5340 MS2286

    Hello!
    Please, help me!

    Notebook
    Model: Acer Aspire 5740_5340 MS2286

    All voltage is normal. They react to the power button. The fan spins and stops. There are no short circuits. BIOS flashed. EC flash did not reflash. Connected an external monitor. There is a scheme. Black screen. No picture. The laptop does not start.
    What to check?

    Thanks all!
    Attached Files

    #2
    Re: Repairs Acer Aspire 5740_5340 MS2286

    Need to replace the BGA Radeon HD5470 graphics chip. These systems do not respond to diagnostic heat up.

    Comment


      #3
      Re: Repairs Acer Aspire 5740_5340 MS2286

      Hi ,

      First->reload Bios by removing CMOS cell and try to start and check at external monitor

      Second->Check voltages on RAM Coil and try replacing RAM or use in other slot

      Third-> Without power check impedance of each Coil (Big coils) for RAM and GPU

      For reference below is the help

      For Generations 1st, 2nd , 3rd,4th (Socket Processors)

      Impedance Measured should be above 300 ohm for below coils

      For (a) charging coils (b) +3V (c) +5V ( d) +1.8V (e) CPU core (f) CPU GFX (g) RAM coil

      Impedance Measured should be above 12 ohm for below coils

      For (a) 1.05V (b) +GPU core (c) +VCCSA

      Comment


        #4
        Re: Repairs Acer Aspire 5740_5340 MS2286

        Originally posted by mayss View Post
        Need to replace the BGA Radeon HD5470 graphics chip. These systems do not respond to diagnostic heat up.
        I agree.

        Comment


          #5
          Re: Repairs Acer Aspire 5740_5340 MS2286

          check RAM section or first try replacing RAMs or check System power up with removing one stick at a time.
          Last edited by piernov; 11-10-2020, 07:00 AM. Reason: misinformation

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