laptop freezes, usb 2.0 not working, usb 3.0 working

[bociub]

Hi there,

It is sunday and I got a faulty hp pavilion 15-cs1006na. No available schematics on the entire world. It flashed 5 long 4 short and no post then I discovered the usb 2.0 2. pin in one of the usb-a socket bent backwards and been shorted to 2. and 3. pin of the 3.0. after removing this short in the port the laptop came alive.

Now the laptop freezing randomly. The webcam, the built in mic and according to the device manager one more thing not working which are connected to usb. If I connect anything what have usb 2.0 plug that wont work if i plug anything what have usb 3.0 then that works perfectly. Comparing the two usb A socket and their related componenets with a multimeter I did not found any difference. If I try to run 3dmark always freezes during the test.

Can it be more strange? If I connect an usb 3.0 stick to the working usb-a socket before powering on then the webcam, mic works. If I remove it the cam and the mic wont work anymore even if i plug back the stick. No freezing at all! and still something in the device manager which not working on usb. 3dmark runs perfectly again and again. Furtheremore, If I unplug the usb 3.0 stick and I connect and usb 2.0 one then that also works perfectly.

Any idea?

[petehall347]

is the voltage too high on usb ?

[mon2]

Remove all power / no battery. Meter in DIODE mode. Red meter probe, yes red to ground. Black meter probe to point to test.

Test the D+ signal of this socket in diode mode.
Test the D- signal of this socket in diode mode.

Post each measurement. Nearby, on quality laptops, will be an ESD protection device for each such port. It is possible that the ESD diode is now defective from the last event and therefore shunting the USB 2.0 signals to ground or causing them to fail. Post pics of the parts in this region of the board. The ESD devices may be single in nature or perhaps an array (common) where one package protects both the D+ and D- lines and perhaps even VBUS.

[bociub]

5.111 volts. Very stable. Is it too much?

[bociub]

Thanks. So the 4 pins in diode mode are : 0 , 0.487 , 0.491 and 0.585. Are the middle two d+ and d-?

Sadly, there are not too much things. All lines are disappearing in the pcb. There are 3 three legged transistor like things only on the other side, otherwise the board empty.

[bociub]

Some update as I wasted same time again on a horrifying hobbi what i love: I removed the board again to make some nice picture with my microscope and I also tried the board without anything connected... so the battery, an external monitor, memory, ssd were connected and still there is a thing what connected to the usb and malfunctioning according to the device manager. That thingy is on the motherboard but I have no idea what that is, where it is.(picture 1.jpg). Defenetly, not the sound or the lan. Maybe something what is related to the usb-c? How can I find out what that is? When I disabled it I did not lost any functionality(or I could not discover it.)

If I disable the entire usb controller in the device manager then I was not able to frezee the laptop with 3dmark however if I disable the misteruous usb device then the laptop still frezees sometimes.

Behind the damaged usb port a diode just fell of by touching it(picture 2 - I melted the solder to make it look nice). It is a three legged thingy with ZJ sign on it and looks like it supposed to short two datalines to the ground. (red circles). Anyway it did not change anything.

ant idea?

[piernov]

USB 2.0 controller is probably detecting that a data line has been pulled up but the device does not answer when queried. USB 3.0 detection mechanism is a bit more complex but I'm not sure if it can show these symptoms.
Card reader and Bluetooth controller (can be inside Wi-Fi card) can also be connected to the USB bus.
There are like 10 different USB 2.0 ports going to the PCH, so a lot can go wrong, and of course the USB controller inside the PCH itself could be damaged.

[petehall347]

have you tried just a usb cable plugged in ?

[rogfanther]

Take a better look at these guys. The lower one seems to have something blown on top of it.

[mon2]

The part on the left is a flow through pinout ESD array with a built in zener clamp diode to keep VBUS @ 5 volts (no higher voltages allowed).

The part on the right is an EMI filter to suppress the highspeed switching noise created by the USB bus interface.

Respectively, flux and carefully reflow the part on the left and remove off the board. Just leave the component off the board for now. Confirm that the PCB pads are not solder shorting using desoldering braid.

Then power up and test again. Repeat with the next USB connector if needed. These parts are sacrificial that die after a transient hits the USB connector(s).

The parts are < $ 0.10 USD each. We use them in high volume on many of our designs. They work very well.

You can purchase replacements from many vendors - we use SOCAY (China) but there is also Texas Instruments who offer drop in parts you can probably source through Digikey / Mouser / Arrow.

This part is very likely to be:

ULC0524P

ULC0524P Leiditech | C384892 - LCSC Electronics


TI # TPD4EUSB30

TPDxEUSB30 2-, 4-Channel ESD Protection for Super-Speed USB 3.0 Interface datasheet (Rev. G)