Hp 2x usb ports not working

[frankkrantz]

HP BDL50 LAD704P (HP 250 G5 MODEL)

Hi,

Both usb ports have stopped working.

Does anyone know what component may require replacement from looking at the enclosed photo, i have noticed if i plug a 5v supply usb lead into any of the 2 ports they both work again, (maybe that helps to diagnose the issue).

Thank you

[Techtiger]

Re: Hp 2x usb ports not working

Check the voltage of US1 IC all pins

[frankkrantz]

Re: Hp 2x usb ports not working

will do thanks, what does US1 IC actually do ? should there be a voltage on all pins ?

[Vesko356]

Re: Hp 2x usb ports not working

will do thanks, what does US1 IC actually do ? should there be a voltage on all pins ?

It's switching the 5V from the motherboard side to usb port side, when you click right mouse button and select remove usb device it's cutting the power to the selected usb port.

[Techtiger]

Re: Hp 2x usb ports not working

will do thanks, what does US1 IC actually do ? should there be a voltage on all pins ?

This chip converts +5VALW to +USB3_VCCB (+5V)

[frankkrantz]

Re: Hp 2x usb ports not working

Where can i get this chip from if faulty, is there a work around or can i buy the chip ? thanks..

[Vesko356]

Re: Hp 2x usb ports not working

Where can i get this chip from if faulty, is there a work around or can i buy the chip ? thanks..

Workaround? Not recommended theoretical workaround is to short the 5V power line from motherboard to usb port, but you will stay without any protection in case of short to ground at usb side, so it's very dangerous including for the cpu, hub and so on, just replace the part.

[frankkrantz]

Re: Hp 2x usb ports not working

ok thanks, i understand, where can i buy the part ? i can't find a referance to it anywhere online...hope you can advise..

[Vesko356]

Re: Hp 2x usb ports not working

ok thanks, i understand, where can i buy the part ? i can't find a referance to it anywhere online...hope you can advise..

Find datasheet for your board, search for US1 in it, when you find it part name will be written there, so with that information you can surch and buy the component.

[frankkrantz]

Re: Hp 2x usb ports not working

Unable to find a datasheet at the moment, no referance to K1126, maybe someone knows it as another component name i cant find any info at all on this ic ..thanks

[Vesko356]

Re: Hp 2x usb ports not working

Unable to find a datasheet ...

Try harder

SY6288D20AAC_SOT23-5

[frankkrantz]

Re: Hp 2x usb ports not working

Thank you,

Here's an odd thing, i disconnected the ribbon cable to the other single usb port on the right hand side of the laptop today (this has always worked ok) & (see photo enc) & to my surprise the 2 x left usb ports sprung back to life...does this still mean "US1" ic as previously mentioned is still faulty please, when i plug the right side back in the 2 left ports go dead again..it's an odd thing going on, hope somebody can advice before i commence to replace components...

[ktmmotocross]

Re: Hp 2x usb ports not working

thats why u must measure before replace.
check if that connector is not broken and give us picture of that usb

measure resistance to ground/outer metal part to pins of that connector