problem with hp 8470

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  • marcelofct
    Senior Member
    • May 2019
    • 122
    • chile
    #1

    problem with hp 8470

    hello friends i have a problem with this laptop and it does nothing i need your help
    I have made these measurements:
    19v in fuse
    3 volts in power button
    in u6100 charger (TPS51123RGER) I have:
    VIN: 18.35V
    EN0: 3.11V
    REG5: 4.96V
    REG3: 3.25V
    ENC: 0.06V

    please help me

    attach schematic
    Attached Files
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Re: problem with hp 8470

      Check U6104 and Q7350 as you dont have EN_5V_3V(ENC). Btw, U6100 is not charging IC, its your 3V/5V Regulator IC.

        Comment

        • marcelofct
          Senior Member
          • May 2019
          • 122
          • chile
          #3
          Re: problem with hp 8470

          Originally posted by mcplslg123
          Check U6104 and Q7350 as you dont have EN_5V_3V(ENC). Btw, U6100 is not charging IC, its your 3V/5V Regulator IC.
          I followed what you told me and
          U6104 has voltage on pin 1 (3.2v) and on pin 2 I have no voltage, I only have 3.3v on pin 5, I think that on pin 1 is the KBC_PWR_ON signal
          the other signal is CPPWR_EN that goes to pin 2 and I do not have it, I followed it and I do not have it in the kbc, thanks for your help I stay tuned

            Comment

            • marcelofct
              Senior Member
              • May 2019
              • 122
              • chile
              #4
              Re: problem with hp 8470

              someone help me

                Comment

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