XO Troubleshooting USB

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A full set of eye patterns is generated for testing the wiring of each USB port when running the Open Firmware hardware tests. See Hardware Self-Test.

One of the USB ports doesn't work

This is typically due to broken connector or solder joint at the affected connector.

All of the USB ports receive power from a common switch, so if there is a problem with power it is likely due to the above reasons.

None of the USB ports work

Measure the +5V supply at the USB connector (or across C509 or C551). If it is not present, the USB power switch and current limiter, U56, may be broken. It may be bypassed by a 0 ohm resistor at R466 for testing purposes.

If the audio (speakers) is also non-functional, then the problem is the +5V supply on the motherboard.

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