• Asrock H81m-itx problem z gniazdami usb

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#1 Asrock H81m-itx problem z gniazdami usb


by alien99 18 August 2022, 13:12
WItam od jakiegoś tygodnia pojawił się w moim komputerze problem z gniazdami usb. Raz widzi podłączony sprzęt raz nie wykrywa wcale itp. Po podłączeniu miernika usb pokazuje napięcie 3.6v na usb więc podejrzewam że w tym tkwi problem w innym komputerze i laptopie po podłaczeniu tego samego urządzenia przez miernik mam 4.94v i tam sprzet wykrywa bez problemów. Raczej nie jest to wina zasilacza którego podejrzewałem od początku bo na molexach zasilacza do płyty mam ok 4,97v. a na samych gniazdach usb ok 3,5-3,7v. Czy ma ktoś jakiś schemat do tej płyty?

Re: Asrock H81m-itx problem z gniazdami usb


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#2 Re: Asrock H81m-itx problem z gniazdami usb


by matic 18 August 2022, 18:49
Hello!

Check the voltages to ground on both pins of highlighted fuses (picture below), when the voltage on USB ports is too low.
Image

#3 Re: Asrock H81m-itx problem z gniazdami usb


by alien99 20 August 2022, 08:38
I connected the navigation to one of usb 3.0 and windows reports "unrecognized device". The voltage on the meter is 4.075v. On the fuses as shown in the photo.
Image
Image

#4 Re: Asrock H81m-itx problem z gniazdami usb


by matic 20 August 2022, 10:39
The fuse, where you have 4.11V on one side is broken. Replace it.
This is a PolySwitch (PTC) resettable fuse. As for the value we need a clear picture with visible markings on it.

#5 Re: Asrock H81m-itx problem z gniazdami usb


by alien99 20 August 2022, 11:27
Jest na nim napis: " PU"
Trochę wyraźniejszy obraz:
Image

#6 Re: Asrock H81m-itx problem z gniazdami usb  [SOLVED]


by matic 20 August 2022, 11:47
alien99 wrote:Jest na nim napis: " PU"
Trochę wyraźniejszy obraz:
[ Obrazek ]
It's 2.6A PTC resettable fuse SPR-P260T package 0805.
Datasheet at the attachment.



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#7 Re: Asrock H81m-itx problem z gniazdami usb


by alien99 24 August 2022, 09:52
Matic dzięki bardzo, pomogło :)

Re: Asrock H81m-itx problem z gniazdami usb


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