If one of your touchpad buttons is not working this may indicate there is a broken connection from the touchpad sensor to the electronics.  We’ll have to open it up and take a look to be certain.  The entire process should take less than an hour.

Sections:

Tools:

Supplies ( dependent on problem ):

Start by plugging in the hub and taking the dome lid off.  This will bring the tray out.

Now you can take the food pod and food tray out.

Flip over the hub and peel back the large rubber foot pad you should see 6 screws.

Some of the adhesive may rip off of the rubber pad and this is where the super glue will be necessary in putting it back together. But lets open it up and fix it first.

You need to peel back the smaller foot pads partially to get access to the last 2 screws. 

Note: It might be difficult to peel these back by hand so you can use the flathead screwdriver to poke down on the side where there is a cavity and pry it up.

There are 8 screws in total.

Take the bottom lid off.  

Note: This photo can serve as a good reference for putting any wires back in place. Also make sure to keep track of the location of each white rectangular LED light.  According to this photo its actually fairly easy to mix up the right and middle LED during reassembly. 

Once you take off the lid for the touch sensor compartment, in the middle where the dome lid latch slides in, you can see a ground trace that travels really close to that opening.  This is our most common culprit.  Inspect it for any scratches or cuts.  If you see any cuts you can repair it with the conductive pen or ink.  

The right touch sensor will be the one on the left when it’s upside down.  You can take the LED out and look at the square contact point and follow all of the traces to make sure they are not scratched or damaged.  

Example of damaged ground trace

Use the Conductive ink to repair the trace and you can cover it up with some Kapton tape to prevent further damage.

Example of Repaired ground trace

Yours may be different than what I have in my photo below, some are welded.  If it is not welded, press them down with your fingernail and stick a piece of foam between the contact and LED light to make sure that contact is firmly pressed together. On the right one, while the hub is upside down, you will need to add 5 or so pieces of foam to build it up and apply pressure from the lid instead of the LED light.

Example of Ultrasonic welded version

Example of foam padding added

Adding Kapton Tape for protection against dome lid.

Now we will add a layer of Kapton tape to the trace where the dome lid enters the compartment.  The new touch sensors have an additional layer of protection on them, but that still doesn't prevent the dome lid from catching the trace and damaging it.

You will want to cut three small pieces of maybe 1/8" to 1/4" inch thick, like in the example photo below. If you press down the correct amount, you will cut through the tape while leaving the backing in tact and it'll make for an easy peel up.

Once you have them cut, you can use the knife to peel up your pieces.  

And finally arrange them half on and off the touch sensor to create a ramp, so the lid will not catch the touch sensor upon entry.

Where the touch sensor plugs into the electronics, there are 4 pins soldered to the board. Ground yourself or discharge any static electricity.  While the hub is plugged in you can touch these pins to simulate the touch pad.  Don’t worry it’s very low current and voltage. If you don’t feel comfortable touching it you may also use something metalic to bridge those pins and it will do the same.

Listen for that 3rd tone that is not currently working.  If this makes the sound then we know the electronics are in good working order and the problem exists in the touch sensor or the connection.

Make sure the touch sensor is plugged in securely to the electronics.  You can unplug and replug the ribbon to confirm a good connection.

To test for a successful repair, just put a couple of screws back in the lid and flip the hub over and wait 10 to 15 seconds for the touch electronics to re-calibrate and test by touching the sensor normally.  You may also unplug and replug in the power and test again after a full reboot.

Hopefully the problem is obvious and it is an easy correction on your end and your pup can get at it!