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    #1

    Gigabyte aero 5 XE4 - no post

    History on what happened:
    Troubleshooting a esp32 while it was plugged into a usb port also hooked up my bench top psu to the esp32 set a 5V1A on the vcc. Ground was wired in.
    When I powered on the psu the laptop went dead. Unplugged everything and forced rebooted and no post, no charge light, no fans. Keyboard lights up and the cpu and gpu get warm. Pulled the board out and visually examined it and didn't see any blown components. Checked for shorts on the chokes and none found.
    No board view or schematic available.
    The laptop has a 3070ti and 12700h, the pch is integral to the cpu on this gen.
    Is it possible that I shorted the pch?
    Thanks,
    Tags: None
    #2
    Good. When you are ready, you can come over and assist us with our ESP32 experiments. Strong vendor (Espressif) but the documentation is lost in space. Attempted to run a matter project (ESP32-C3) but apparently need an Apple Homekit hub. Good to know.

    Based on your details of the USB port experiment -> locate the USB connector that you used for these modules. Nearby will be a USB loadswitch which probably will be in a SOT23-5 or maybe SOT23-6 package. This device is supposed to act like a solid state relay where the VBUS voltage of 5 volts will be shut off if the current draw is exceeded. Most of these USB load switches do not work as advertised and rather short themselves to death. This is probably the fault of your case but locate the area and share pics for a review.

    Comment

      #3
      Thanks for the reply,
      Don't think I'm your guy for any esp projects given my track record so far.
      Here's a couple close ups of the area.

      Here's a datasheet for that chip in the middle,
      https://www.mouser.com/datasheet/2/1..._1-2513137.pdf



      2 Photos

      Comment

        #4
        The VBUS of the nearby USB connector will have the large black tantalum capacitor to filter the voltage ripple. With your meter in DC volts scale of 10 volts or higher, use the meter to check the voltage on this capacitor. Red probe on the side with the '+' silk screen; black probe on the other side or any metal shield. When the adapter is attached, do you see +5 volts here? If yes, this VBUS rail is ok and the USB switch is passing through the voltage for this connector. You can also just dock a USB mouse to see if the LED turns on for the bottom side of the USB mouse.

        Based on no schematics, consider to locate each large inductor onboard. Each such inductor (often will be grey or black in color) is linked to a local power supply. Meter in DC volts mode (20 volts or higher is ok). Red probe to either side of the inductor; black to ground. Make a note of which inductors are without a voltage. The power path is explained very well in the charger article (see sticky above by @Piernov) - a must read. This power path starts from the power adapter and often follows with 2 x DCin mosfets which works with the charger IC to power the board and/or charge the local battery. Review if you have ~19 volts at the DCin connector and locate the mosfets (8 pin devices with 4 pins on each side) to inspect the voltage on their pins.

        Post a pics of these mosfets and also the charger IC which will be near the same DCin connector.

        On the Pericom USB repeater - that is the chip that cleans up the USB signals for long cables to build what is called the perfect 'eye pattern'. In summary, a logic '1' signal on USB lines will turn into a logic '0' signal after a length of cable. This repeater IC restores the '1' that is closing into a '0' state.

        Comment

          #5
          Did some poking around,
          See both images, I just did the top side.
          The cpu does get quite warm, I'm guessing a good short on the cpu if its reading 0v but getting warm.
          2 Photos

          Comment

            #6
            The 1.8 Ohms there actually mean this is a dead end. Likely +VCCIN_AUX for PCH. Even the 5 Ohms there are quite low for FIVR (Full integrated voltage regulator) design. I do bet, the data lines of the USB-Port where the incident happened measure shorted to GND too. Bad luck, my friend.
            FairRepair on YouTube

            Comment

              #7
              Yeah I figured that was the case, the previous generation design I found some measurements that were posted here and the fivr area was 100ohms +.
              thanks for the insight on the +VCCIN_AUX.

              Comment

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