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the USB is not working I tried all the Dell diagnostic and it is failed.
I tried to rest and still not working.
BIOS is good.
I need to get it repaired but dont know which chip is responsible as both usb ports are not working
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Most common case is the burn fuses of the USB port.
A) Check the fuses – if available
B) You can check the power rails and it should be 5V – if you get >4.0V check the main PMU (Power management unit)
C) 3rd Gen Intel core CPU works with PCH (Platform Controller Hub), the PCH is the responsible chip for USB functioning
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