Service Forum

atari · Interesat Joined: 27 Feb 2006 Posts: 26

I get somehow dead usb ports on my x40, sd reader still works. Any tip?

victor · S.F. Boss Joined: 07 Mar 2004 Posts: 2581 Location: Staff

Check to see if they provide the USB+5V
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Victor Voinea
ALLservice HQ, Romania.

atari · Interesat Joined: 27 Feb 2006 Posts: 26

I have 5v on bouth usb & it is enabled in bios. When booting(f12) & in win or linux cant see any usb device

victor · S.F. Boss Joined: 07 Mar 2004 Posts: 2581 Location: Staff

Yes, but you have to messure the voltage after attaching an USB device. Try to see if the USB 5V stays the same.
The best way is to connect a device that is only using the USB power, not the data, like an USB phone charger or maybe an USB lamp.

I am trying to see if there's a power problem or else.
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Victor Voinea
ALLservice HQ, Romania.

bbnimda · Interesat Joined: 09 Mar 2008 Posts: 11 Location: DMZ

Hi Victor and best Wiches for 2009 Wink

I have the same Pb, and I checked the power by connecting my phone, and the power provided is ok, what do you think about this Victor

heta · Posted: Sun Apr 12, 2009 4:18 am Post subject: usb problem fixing

hello all ...about the usb port problems
if the 5V is okay .. u check the resistance between the GND and both data lines in the port [ d+ , d- ] u connect the red ohm-meter prob to the GND and the black prob to d+ and then to d- of usb port [ohm meter on diode measuement sign] , the resistance shout be between 500ohm to 700 ohm ..if not then for sure the problem in the south bridge if it is intel u'll see on it [NH- or FW82801DBM /CAM /FBM / GBM / HBM ] any way the problem is for sure from this BGA ic
best regards
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the best thing in the world is electronics thanks God ,

victor · S.F. Boss Joined: 07 Mar 2004 Posts: 2581 Location: Staff

In diode mode, the multimeter shows Volts, I guess you should say 500-700mV which is the open voltage for a diode.
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Victor Voinea
ALLservice HQ, Romania.

heta · Posted: Thu Apr 16, 2009 4:28 pm Post subject:

yes victor ..Absolutely true ..diode mode 500-700 mv but i tried to describe it simple since diode mode with low range ohm mode with buzzer in most multimeter
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the best thing in the world is electronics thanks God ,

The Racer · Nou Venit Joined: 31 May 2006 Posts: 4 Location: Albania

I have caused the problem on my IBM somehow shorting +5v pin with d- or d+(cant remember). Now when i connect a HTC phone it starts charging. When e measure the values it shows 5.12V between GND and V power. D- and D+ show on diode mode (with red wire on GND and black on D+\D-) 569mV and 567mV. USB is enabled on bios. Please Victor i need any hint because i have a t41 for spare parts and i'm good on hardware.
BR

heta · Posted: Sun May 10, 2009 8:36 pm Post subject:

everything u said is okay vcc,gnd,d-,d+
the only thing left is the fw82801dbm
u have to replace it
if u live here in Egypt i would replace it for u for free
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the best thing in the world is electronics thanks God ,

The Racer · Nou Venit Joined: 31 May 2006 Posts: 4 Location: Albania

heta · Posted: Tue May 12, 2009 11:41 am Post subject:

rc82540EP is not fw82801dbm ..82801 is a big one u'll find it i think under the wireless lan card is ur ibm
here's the fw82801dbm
http://upload.ecvv.com/upload/Product/20085/China_FW82801DBM20085272249099.jpg
wish u luck
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the best thing in the world is electronics thanks God ,