Back USB port on 722

[BBCInc]

After blow-out dusting my 722 (non K), the rear USB port no longer works with an EHD. Is a USB port that susceptable to dust particles?

 

[TheKrell]

Does the front port still work? (I suspect your EHD...)

 

[BBCInc]

Yes it does, that's why I'm confused.

 

[jtiner]

Yes it does, that's why I'm confused.

It's possible for compressed air to generate a static charge and damage components, but I've never actually seen it happen. It seems more likely that something else happened when you disconnected/reconnected the cable. Perhaps there's a cold solder joint/mechanical issue where the socket joins the circuit board.

 

[BBCInc]

There has been other unusual behavior on that port, like not lighting the LED on the Sling adapter, but I had attributed it to using an unpowered USB hub. Now it doesn't work with the EHD even if it's direct connected.

 

[BBCInc]

I've heard that about compressed air but also never personally experienced it. Of course ESD is a very arcane science. Will try to remember to check check the port for mechanical damage in 6 months when I do the next dust blow-out. For now everything is working OK from the front port, just don't like the aesthetics.

 

[dwarren2]

Did you do a unplug reboot? I've had my rear usb seem not to work with my powered hub until I did a hard reboot.

 

[BBCInc]

I did do a reboot somewhere in the process, although I can't say for sure it was unplugged. Will try that along with a thorough port blow-out with a new can of compressed air and see if that helps.

 

[3HaloODST]

The main things to consider with canned compressed air are not to use it upside down and not to blow the air for more than a second or two at a time.

Sounds to me like the receiver needs a replacement, if the USB port is not working correctly.

 

[BBCInc]

Did a careful blow-out with a new can of compressed air and am happy to say the rear USB port on my 722 is back to full operation. My conclusion is enough residual dust must have entered it during the first dusting to disable EHD detection. Thanks everyone for your help!