Toshiba Satellite L500 - No power on

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  • gcomputers
    Badcaps Veteran
    • Apr 2013
    • 509
    • Albania

    #21
    Re: Toshiba Satellite L500 - No power on

    Originally posted by gcomputers
    any help please
    any suggestion

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    • gcomputers
      Badcaps Veteran
      • Apr 2013
      • 509
      • Albania

      #22
      Re: Toshiba Satellite L500 - No power on

      Hi anybody can suggest me anything , what can i burned when removed PQ14 ???????

      Comment

      • meritosari
        Senior Member
        • Oct 2010
        • 774
        • Indonesia

        #23
        Re: Toshiba Satellite L500 - No power on

        Hi, I'm not the expert, but I'll trying to explain what I already know.

        Old compal design a little bit different than new, newer mobo which released it 2012 till latest
        - the old compal using IC comparator LM393 as vin detector and precharge circuit.
        - power button has 15-17v
        - push pull transistor used to protection circuit if there are over voltages or over currents to flow to main rail (B+) in this case PQ11 and PQ14. if B+ was ok both of them work together can send "command on" via gate mosfet PQ8 and PQ9 and vice versa
        - need more attention understanding schematic and of course spending your time.
        - finally, read.... many threads on this forum about power issue, many people has experience likes whaldsz, atsio, khaahk, th3_uniqu3, dycc, highpulse, dj_ricoh and the others that can't I mentioned one by one

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