A
common problem that arises for computer users is dealing with the USB Device
not recognized error. This error is thrown after an USB device is connected to
the computer but is not automatically detected.
When the error occurs, the Windows Device Manager may also list the component
as an "unknown device" depending on the type of error.
Or
the Laptop/Desktop completely unable to detected any electronics USB device no
any error has shown on the display.
Some times computer only detect few hardware that don't draw power from
the computer via the USB connection like printer and many other hardware that
requires external power source to work.
Now let me divide this USB problem to parts to easy understand and diagnose the
fault for both USB 2.0 and USB 3.0 :-
- Laptop not detecting any
electronics device which draw power from USB port like pen-drive
or any USB device (USB
2.0 & USB 3.0) detected.
- Laptop detecting the hardware
witch plugged in the USB 2.0 or USB 3.0 port but not recognizing
the hardware device (error pop up shows "USB not
recognized")
When you switch on the computer or connect any USB 2.0 or USB
3.0 devices, a BIOS message or Windows message may be displayed such as:
- CMOS checksum error.
- USB device overcurrent
status detected.
- Error 0701: USB Over
Current On HC/Port - Bus:00H Dev :1DH Fun:01H / Port:00H
Error 0701: USB Over Current On HC/Port - Bus:00H Dev :1DH Fun:02H /
Port:00H
- Error 0701: USB
overcurrent error.
- USB Device error.
- Shutting down in 15
seconds
- Device recognized on normal 2.0
but not on 3.0.
Make
sure before you read this solution, you made sure that everything is okay on
the software side your device driver and OS settings like ''USB 2.0
or USB 3.0 Hub Power Management should be disable or
have configure correctly and also BIOS settings are configured
correctly and up to date. Make sure
that USB is enabled from bios settings.
Before I stat the solution of this problem let
me introduce some basic thing about the electronics behind the USB.
We have two type of USB.
Both power up the device from +5v Vbus pin to
power up the small USB devices like pendrived and mouse the difference is USB 3.0 has
double data lines for Superspeed high speed interface.
Both port detect any device by their data lines.
|
Pin
Number
|
Pin
Name
|
Description
|
|
1
|
VBus
|
+5V Power
|
|
2
|
USB D-
|
USB 2.0 data
|
|
3
|
USB D+
|
|
4
|
GND
|
Ground for power return
|
|
5
|
StdA_SSRX-
|
SuperSpeed receiver
|
|
6
|
StdA_SSRX
|
SuperSpeed receiver
|
|
7
|
GND_DRAIN
|
Ground for
signal return
|
|
8
|
StdA_SSTX-
|
SuperSpeed transmitter
|
|
9
|
StdA_SSTX+
|
SuperSpeed transmitter
|
USB 2.0
|
Pin
|
Name
|
|
Description
|
|
1
|
VBUS
|
|
+5 V
|
|
2
|
D−
|
|
Data −
|
|
3
|
D+
|
|
Data +
|
|
4
|
GND
|
|
Ground
|
1. Laptop detecting the hardware plugged in the USB
port but not recognizing the hardware device (error pop up shows
"USB not recognized")
If the +5v is okay on the port and the system only
detect the hardware not able to recognize the hardware that means
something is malfunction in the date lines tracks form USB port to south
bridge. Check the coils and fuse able SMD resistor for open which are connected
in series of data liens with the malfunctioning port. If coils not found open
then heat up the complete motherboard using the hot air gun.
Make south bridge and the nearly components of USB port
you main focus when to heating up the main board. After did all thing if
you sill have problem then it means south bridge is dry-sold or the some track
is broken on main board.
now only two things can be done to resolve this
problem..reflow or reball the south bridge.
if this 'not recognizing' problem comes with the all ports of
laptop or desktop board then the problem happens due to BGA south bridge if you
already tried bios reflashing.
But don't worry i m not gonna tell that the time is to change
the south bridge. Because it's pretty risky work to replace a big BGA
chips on a laptop motherboard.
Just you need to re flow the south bridge using a simple hot
air gun or a IR BGA rework station.
You can see my older post if you gonna use the simple hot
airgun to reflow you south bridge.
Be carefully because if you not ever had any BGA re flow. a
mistake can be damage your main board or the chip.
2. Laptop not detecting any electronics device
which draw power from USB port like pen-drive or any USB device
detected.
This problem is related with main board of desktop laptop
computer. If you facing this kind of problem then first thing that I would like
to let you know that is this problem happens due to the missing +5v on the
port. because if laptop not able to detect device that draw the power from the
USB port to working like pen drive mouse keypad. If USB device didn't get
the power how they will work?
In every laptop and in some desktop mother board manufactures
use a switch circuit for power management and protect the motherboard from
shorted USB device and to protect form overload. Mostly you will found the VBus pin fuse open or the switch IC faulty.
This
switch is normally is a SMD chip that provide the
power. Each and every USB port can be have a single chip as
there power management switch and also a chip can manage two or more port
depends on the manufacture.
So
simply take out the motherboard of laptop on your working desk and trace out
the track of VBus of the port that malfunctioning and check the fuse or coli
for open if this used in series of . pin to USB power manger chip. if it's okay
then now check the input voltage of chip if available first of all resold
the chip and then make sure chip gets the enable signal is available on the
chip. you can download the chip data sheet to know the pin details of
chip. But as per my experience you don’t have to download the chip data
sheet because mostly laptop have same chip for every port so it's easy to
diagnose that chip has problem or not. Simply check the same voltage on the so
this fault happens some of reasons if you ever plugged in any sorted USB device
in USB port or due to port broken and also can be happens.
3.
When you switch on the computer or connect a USB device, a BIOS message or
Windows message may be displayed such as:
- CMOS checksum
error.
- USB device
overcurrent status detected.
- Error 0701:
USB Over Current On HC/Port - Bus:00H Dev :1DH Fun:01H / Port:00H
Error 0701: USB Over Current On HC/Port - Bus:00H Dev :1DH Fun:02H /
Port:00H
- Error 0701:
USB overcurrent error.
- USB Device
error.
- Shutting down
in 15 seconds
If you get the this kind of error message on starter (POST)
screen wham you turn on the laptop or desktop computer than that meas any short circuit in the USB port.
So simply check the port for physically
broken normally the broken USB socket is the
most reason of shorting in USB power supply line.
if no any port the seems like broken or short the problem
will can be in USB power manager chip simple check the USB
VBus shorting with ground.
|
|
|
Laptop USB Power Supply Circuit
|
And the good news if you have problem with USB power
chip and it's availability is out of reach from you then u can easily
bypass the USB port supply... remove the USB power chip and just short the
input and output track of chip using a wire.
|
ON BOARD USB POWER CONTROLLER CHIP
|
4. Device recognized on normal 2.0
but not on 3.0.
If USB 3.0 device not recognized by
the usb 3.0 port and your hardware device and the settings
of USB is seems okay then check the StdA_SSTX, StdA_SSRX pins
or and coil for open and dry.
Resold the coil and USB header.
