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no power acer aspire 4715z

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    #1

    no power acer aspire 4715z

    hi to all,

    does anyone have schematic of this?
    laptop has
    no power
    no led lit

    i test the power source from dc jack, power 19v is ok.

    but comes to the first resistor R178, one lead tests 19v but on the other lead has no voltage. i suspect resistor is open. but the thing is, there is no marking value because it is so tiny.

    does anyone know the value of this resistor?
    is it alright to replace it with another resistor taken from old mobo with the same size of the resistor?

    tia

    thanks in advance
    Attached Files
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    #2
    Re: no power acer aspire 4715z

    i have successfuly replaced the resistor.
    adapter LED now blinks
    it looks like it has a short...

    Comment

      #3
      Re: no power acer aspire 4715z

      Do you now have voltage on the resistor?

      Comment

        #4
        Re: no power acer aspire 4715z

        hi,

        i'm dead tired looking for the shorted component the whole day later to know that i created the short myself. replacing the resistor made it shorted. i checked the original resistor to be good with higher value. i replaced it with like a jumper resistor that made it shorted.

        good thing i didnt throw the original part. now i place it back and works to its prior state. no power but with 3.3v standby voltage at power switch.
        when power button is pressed, 3.3v goes to low but laptop does not turn on.

        its really hard to troubleshoot without schematic. please, if you have a copy, post it here...

        thanks

        Comment

          #5
          Re: no power acer aspire 4715z

          hi,

          i have some tests on AO4433 mosfet.

          ping 1-3 19v
          pin 4 19v
          pin 5-8 6.3v

          what could be wrong?

          Comment

            #6
            Re: no power acer aspire 4715z

            here is the schematic i found at www.lqv77.com
            Attached Files

            Comment

              #7
              Re: no power acer aspire 4715z

              Hi tia,

              Did your issue solved? I also encountered the same issue...

              I have a supply issue on my laptop. My charger just blinking when i plugged the cable to jack input. I have verified with another charger set but problem still persist.Then i tried to disassemble my laptop to find out the root cause. My finding is the blinking only happen when the dc cable connect to the supply circuit(see attachment). When unplugged the connector from the circuit/board my charger not blinking anymore... So i need your team help to clarify this issue. Im looking forward gor someone advice. Thank you very much! -Mr.Haidar-

              Comment

                #8
                Re: no power acer aspire 4715z

                is it the same model 4715z?

                Comment

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