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How do I check for continuity on USB ports?

Purchased a faulty PS4 model CUH-1216B

USBs are both dead i’ve had a scan around the motherboard using a woefully cheap microscope and i think i may have found a transistor or capacitor that looks faulty.

However i know that on this model the southbridge IC controls the USB2.0 -USB3.0 and so i’d like to diagnose and rule out anything fuse or component based before i go down a rabbit hole.

How would i check for continuity of the USB ports? I’ve attached a USB meter which gives no reading so there is absolutley no power there to the ports.

Any help greatly appreciated.

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Hello, see if there any continuity between at least 2 USB port ground pins, and try this set up at your own risk

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refer to this image for more details.

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I have continuity there the USB ports themself are fine. But there is no power getting to them. I suspect the southbridge controller IC is at fault but before i look at that i would like to rule out any other power issues.

There are a couple of what look to be MOSFETS running on the traces for the USB i figure they may be smart enough to recieve a signal from the Southbridge and shutdown power/data.

I tested them whilst the machine was powered on and indeed i got 5V on VCC however my probes are a little thick and i shorted another pin causing the MOSFET to burn out.

Interestingly after one of them burnt out the other USB recieved power but no data.

After plugging in the controller however it also made the last MOSFET burn out resulting in 3v power only.

I've since removed those and awaiting replacements but i am sure it won't remedy the issue but put me back to square one with no power/data but at least i will be no worse off.

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Darren sera éternellement reconnaissant.
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