Fixing a non-working USB port on a no-brand KVM extender

[BlueBanana]

This is the board inside the several-month-old KVM extender (or, more specifically, the receiver unit) I've got from AliExpress:


(click to enlarge)

This is the part of the board in question:


(click to enlarge)

The problem started a couple weeks ago when one of the USB ports (CN19) stopped working properly. This was what I saw on the oscilloscope when I plugged in a USB mouse (yellow = D-; blue = D+):


(click for the whole 10-second shaky-cam action)

The same mouse connected to CN20 (the good port) appeared as follows on the oscilloscope:


(click for the whole 10-second shaky-cam action)

My first instinct was that the TVS array (the 0522P) for CN19 was busted somehow, but saving pulling the chip out with a rework station, I had little way to test my theory. Besides, since I was an amateur still figuring out my way with my 1000W beast of a rework station, I'd much rather not put my skills to the test that hastily. What's more, given that the 48-pin TQFP chip both USB ports run off of had already got all its markings filed off out-of-the-factory, there would be not much of a point for me to muck with the board if the 48-pin chip rather than the TVS array turned out to be the culprit.

So, here's my question to you guys: should I try and pull out the TVS chip and see what happens and maybe track down the details of the mystery chip somehow, or should I just forget the whole thing and shell out for a replacement unit?

Cheers in advance!

Edit: Inline pictures; title

Edit 2: After all the views and no replies, I decided to pull out the TVS chip to see what would happen. As it turned out, the mystery 48-pin chip was the culprit, and given it would take far more than it's worth to figure out what it was (and that's to put aside whether a chip replacement was feasible at all), I supposed it would be easier to just buy a replacement unit rather than try and fix the busted port.