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Hp CQ62 SIO problem EC_USB_PWR_EN

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    Hp CQ62 SIO problem EC_USB_PWR_EN

    i have hp PM_A_HPC_S_MV_MB_V1 MOTHERBOARD.
    the 3.3/5v voltage regulator is working.
    i do not have the 5v on usb.
    following the schematic i notice that from ITE8502 ,EC_USB_PWR_EN goes to usb chip APL3510 EN pin directly which suppost to be 3.3v, i get 0.05v and then goes to 0 and then back to 0.05v.

    Can i give 3.3v from some other place instead of changing SIO ic!

    Thanks

    #2
    Re: Hp CQ62 SIO problem EC_USB_PWR_EN

    If the APL3510 is shorted why would you run 3.3V from somewhere else. Its an N channel mosfet, test it out of circuit
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      #3
      Re: Hp CQ62 SIO problem EC_USB_PWR_EN

      Originally posted by SMDFlea View Post
      If the APL3510 is shorted why would you run 3.3V from somewhere else. Its an N channel mosfet, test it out of circuit
      Thanks for your reply,

      APL 3510 is not short. The voltage 3.3v is delivered from SIO pin 88 ec_udb_pwr_en to a resistor and then to pin 4 of alp3510.
      As I mentioned when having the probe of multimeter on pin 4 I see that shows 0.05v,then 0v and back to 0.05v.
      I tried resolve ite8502 but still the same result.
      The power on lamp is blinking and laptop does not turn on.

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        #4
        Re: Hp CQ62 SIO problem EC_USB_PWR_EN

        measure pin on KBC.voltage and resistance to ground

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          #5
          Re: Hp CQ62 SIO problem EC_USB_PWR_EN

          Originally posted by ktmmotocross View Post
          measure pin on KBC.voltage and resistance to ground
          On keyboard connector pins 27,32 i get 0v.
          resistance to ground 5.43K but i do not get any shorts

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            #6
            Re: Hp CQ62 SIO problem EC_USB_PWR_EN

            keyboard connector?

            KBC is SIO or EC

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              #7
              Re: Hp CQ62 SIO problem EC_USB_PWR_EN

              Did you got schematics ! post it.
              what's the value of the resistor betwen pin 88 and pin 4 of alp3510 ! is it the same as the schematics !

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