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The Inspiron 15-3521 has an optional touch screen feature and has a 15.6" display. This laptop is also complete with a matte finish and keyboard complete with number pad.

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Why USB ports are not working

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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