• Asrock B250 Pro4 - Nie działa USB

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#1 Asrock B250 Pro4 - Nie działa USB


by microkod 18 February 2021, 23:51
Witam

Mam płytę Asrock B250 Pro4 - płyta startuje pracuje , ale nie działa żadne USB 3.0 i 2.0 ( nawet podpinane do obudowy )

- Sprawdziłem napięcie 5V i występuje na każdym gnieździe
- piny sygnałowe (2 środkowe ) - mają powyżej 4-5 MOhma

Na cewce PL15 ( od mostka ) - jest 3.27 Ohma - czy to znaczy ze jest uszkodzony mostek , zaznaczę ze płyta działa poza USB
Do wymiany most czy na tej płycie jest kontroler USB 2.0/3.0 który mógł się uszkodzić ?

Re: Asrock B250 Pro4 - Nie działa USB


by Google Adsense [BOT] 18 February 2021, 23:51

#2 Re: Asrock B250 Pro4 - Nie działa USB


by matic 19 February 2021, 22:09
Hello!

Check the resistances to ground on all data pins of all USB 3.0 ports. Data pins are "Data +, -" "Receive +, -" and "Transmit +, -" (picture below).
Image

microkod wrote:Na cewce PL15 ( od mostka ) - jest 3.27 Ohma - czy to znaczy ze jest uszkodzony mostek
Yes, this resistance seems quite low. Measure the voltage to ground on this coil.
Is the temperature on the PCH chip normal, when the machine is turned on?

#3 Re: Asrock B250 Pro4 - Nie działa USB


by microkod 21 February 2021, 13:53
Temperatura wydaje sie w normie - lekko ciepły po kilu minutach

Image

Problem jest z jednym USB 3.0 jak widać na zdjęciu z pinem odpowiedzialnym za Receive -

#4 Re: Asrock B250 Pro4 - Nie działa USB


by matic 21 February 2021, 14:03
microkod wrote:Problem jest z jednym USB 3.0 jak widać na zdjęciu z pinem odpowiedzialnym za Receive -
The PCH chip is damaged almost for sure.
Check, if there are any ESD protection diodes near the USB ports. Such diodes are usually in SOT23-6 package.

If there are no ESD diodes, remove the PCH chip from the board and remeasure the resistance to ground on "Receive -" pin of damaged USB 3.0 port.
Also remeasure the resistance to ground on coil PL15 with removed PCH chip.

Re: Asrock B250 Pro4 - Nie działa USB


by Google Adsense [BOT] 21 February 2021, 14:03
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