So I was toying around with a system that had no usb connectivity. Customer said the system displayed to many usb devices connected. I checked it out and found a short on the D+ pin on one of the USB ports. From what I seen the USB data connections should have a pull up resistors. Spent most of the night trying to locate them. I checked every resistor on the console. My conclusion, pull up resistors are inside the south bridge. Believe it was a sad-003 model. 46gg bridge. So, in my opinion it is SB related and needs to be swapped. After checking for parts I am seeing reviews about USB faults when installing the replacement bridge (good old shady vendors). So it appears this is a common fault. Probably due to damaged USB devices causing a short. Also, I have another with a BLOD I was trying to use to compare USB reading. Guess what I found, all USB data lines were low or shorted. So I would assume if you check your USB data lines for shorts on a BLOD slim, it maybe the bridge. This was a sad-004 42gg bridge.
Now only one USB had a data short on the sad-003. I would assume if I had the data sheet for the bridge I could possibly remove it. Reball it excluding the ground pad(s) and data pad(s) for the one USB port and reinstall it to atleast have 1 functioning port. But again, no schematics, data sheets, its all pissing in the wind lol.
To anyone reading. If you know what bridges are interchangeable (say a 42 can be swapped with a 46 or so on). We would all like to know, thanks.
Hope this helps anyone.