USB not working, Finding of problems in sequence
Posted: Sat Sep 17, 2016 3:24 pm
If USB Not working then how to find the problem:
1. Physically check the Usb Female Socket as its have four wire contacts in side must be good and healthy.
2. Check the +5 volts supply If not present then change the Switching Mosfet, also check the drive signal at gate.
3. Check the impedance signal lines in respect ground, it must be high restive 3k and above is good enough.if this resistance is low then need to replace south bridge, Pch now in 6th gen board only single chip that is south bridge+north bridge+cpu all in one chip (standard is IO chip).
4. If USB middle wire have high resistance or say Ok then please check USB clock, and usb PLL Supply (Phase lock loop)
5.In some laptop Like Toshiba this problem seen solved by flashing the bios.
1. Physically check the Usb Female Socket as its have four wire contacts in side must be good and healthy.
2. Check the +5 volts supply If not present then change the Switching Mosfet, also check the drive signal at gate.
3. Check the impedance signal lines in respect ground, it must be high restive 3k and above is good enough.if this resistance is low then need to replace south bridge, Pch now in 6th gen board only single chip that is south bridge+north bridge+cpu all in one chip (standard is IO chip).
4. If USB middle wire have high resistance or say Ok then please check USB clock, and usb PLL Supply (Phase lock loop)
5.In some laptop Like Toshiba this problem seen solved by flashing the bios.
