HP 14-dq2088wm 11th Gen Missing 3V/5V Standby Voltage

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  • platinumsteel
    Badcaps Veteran
    • May 2019
    • 234
    • Trinidad&Tobago
    #1

    HP 14-dq2088wm 11th Gen Missing 3V/5V Standby Voltage

    Hi guys have a HP 14 Labtop. DA0PAHMB8F0 .There is no White LED on the DC Jack .It got a drop of water damage right next to the 3V IC ( Silergy SY8386BRHC) and corroded a resistor and a pad which belongs to the Enable for the IC. I cleaned the area and re-soldered the resistor. Nothing Changed. I don't know what the value for the resistor should be.It measures about 80.0K No schematics available for this model. A good friend on here mon2 helped me identify the IC markings and gave good advice on making sure to measure the input voltages and enables and checking for short.
    There is no short on any of the pins of both the 3V/5V ICs.I have 19V present on inputs for the ICs. But no Outputs and no enables for the 3V IC. I only have 1 enable present for the 5V IC.I tried looking for pictures on google for this board to see if i am missing a resistor where the corrosion was found .But pictures are too blurry. Was hoping anyone of you guys may know where the enable for these ICs come from ? And if u may have an idea what value the resistor could be or if i might be missing a resistor ? I will post pictures for reference. I have also ordered replacement ICs for both 3v/5v ICs in case i might need it in the future. But mon2 mentioned to me that before i can conclude a bad IC I must make sure the required voltages are present or not especially the enable voltages.
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    • platinumsteel
      Badcaps Veteran
      • May 2019
      • 234
      • Trinidad&Tobago
      #2
      Okay guys i just thought i'd report back on how I solved the problem. The corrosion did indeed corroded off 1 out of the 2 resistors and also the 19v pad. It was indeed a voltage divider for the EN1 or enable pin that takes 19v and break it down via the 2 resistors down to about 4.8V.I was able to find the same 3V IC ( Silergy SY8386BRHC ) in another schematic and look at it's layout and was able to see the two resistors and it's correct values. So i found the 2x resistors 150K and 499K on a MacBook donor board and I put them in on the HP 14 board and Immediately got the White led on the DC Jack ON . I pressed power button and machine turned on and we have Picture. Thanks to mon2 again for the IC chart and advice on making sure i have enable voltages before i condemn the IC itself. Really appreciated it.
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        • mcplslg123
          Badcaps Legend
          • Jun 2015
          • 7262
          • india
          #3
          Quanta OP5 Rev C boardview is available on this forum and uses the same IC.
          Just for future reference who gets stuck .

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