My HP Chromebook type-C charger stopped working after a hard pull on the cable. I tore apart the connector and found out the wires just beneath the connector were damaged. I got a new connector to fix them but am confused which wire to connect where.

Charging cable has 3 wires: white, blue, and black. The connector has 4 connection pads: G, D+, D-, and V, see attached image

I checked the voltage between all wires and got:

White - Blue = 2.9 V
White - Black = 0 V
Black - Blue = 2.9 V

Please help me determine which wire should be soldered to which pad.

enter image description here

  • 2
    \$\begingroup\$ Can you do Power Delivery with just three wires? \$\endgroup\$
    – Hearth
    Jan 14, 2023 at 2:38
  • 4
    \$\begingroup\$ @Hearth I believe you can do USB-PD over 3 wires, but the third wire is not D+ or D- so this is a wrong connector. The third wire can be something else and USB-PD chip was in the old connector. \$\endgroup\$
    – Justme
    Jan 14, 2023 at 10:17
  • \$\begingroup\$ You need to cut open the metal shielding around the type c plug the part that actually goes inside the computer the chip is small but it's in there encased in clear silicone \$\endgroup\$ Aug 4, 2023 at 8:22
  • 1
    \$\begingroup\$ That connector appears to have solder pads for only the USB 2.0 connection, this is not suitable for USB-PD. With three wires in the cable is it possible to have ground, power, and communication lines, presumably with a chip in the USB-C plug performing the USB-PD negotiation and communicating by some serial protocol what has been negotiated. Any repairs to the charger is likely to cost more than a new charger. \$\endgroup\$
    – MacGuffin
    Aug 6, 2023 at 6:20

1 Answer 1


The answer is: None of the above, the HP has a chip inside the USB plug.

Perhaps something like Infineon CYPD3177-24LQXQT this chip interfaces with the client device and sends back a feedback signal to command the PSU to provide the correct voltage.

  • 1
    \$\begingroup\$ Thanks @Jasen. Is it a non-standard implementation? If so, will any other after market USB-C fast charger will be cable to charge this laptop? As far as I know all chargers deliver 5v in the beginning and then the device signals to the charger to send required voltage. I don't want to buy hp replacement charger because it's wire is too stiff and prone to damage. \$\endgroup\$ Jan 14, 2023 at 17:05
  • 2
    \$\begingroup\$ it's a standard implementation, but there is a chip in the plug \$\endgroup\$ Jan 14, 2023 at 19:51
  • \$\begingroup\$ I cut apart the connector but found no chip. Maybe it is inside the brick itself but it is not in connector. \$\endgroup\$ Jan 19, 2023 at 8:29
  • \$\begingroup\$ that seems impossible. \$\endgroup\$ Jan 19, 2023 at 9:23

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