Where can we buy the correct home button?

I have several ways to solve this:

One, in the Alexa app, remove all the Echo Dots and reconfigure the Dot as a new device.

Two, power off the Dot, then renter the Alexa app, and see which “Dot” is “Offline”. Remove the others, and power up your Dot.

Three, if all appear as “Offline”, go to “About” , verify the Serial Number for each “Dot” and identify the correct one (read the Serial Number on the base). Then remove the other two and power on the Dot.

That is a very complex disassembly. I do recommend replacing “5000 mAh” with just “5 Ah”. That is less zeroes and one less letter. When lithium ion cells has low storage, using “mAh” was valid. But after passing the 1000 mAh level which is a full amp-hour, it is silly to read so many zeros. It is as bad as stating your height in millimeters (mm), especially if you are taller than one whole meter.

Very complex disassembly. I do recommend replacing “5000 mAh” with “5 Ah”. That is less zeros and one less character.

I wish to recommend not removing the adhesive layer if you plan to reassemble this Echo Dot. I would suggest poking holes to reach the four screws instead. Then reassembly can reuse the same adhesive layer.

That may be the Samsung battery (actually a single cell) not connected due to the ribbon contacts not mated correctly. Open the phone and check the ribbon connector. Be sure its tip fits flat inside the slot, and the tiny cover fitted on it.

When reassembling the back cover, be extremely careful to fit the cover sideways over the three micro switches (on the right side when seen from the front). These are the power, volume up, and volume down switches. If you fit the back cover incorrectly, the switches may be blocked and not work, or worse be torn off the motherboard. I am writing this because this is what happened to me! I tore off the power switch and I had to salvage the switch from a different tablet to replace it. And that switch is extremely tiny!!

The HP Touch Pad battery has two cells in parallel attached to a protection circuit board. These protection circuits will shut down the battery if the cell voltage drops below 2.8 VDC. On one old unit I managed to reach the direct cell contacts and they were below 2 VDC. I will try to recharge each cell individually and see if the protection circuit will reactivate, allowing power to flow through the connector.

In step 1, failure to unplug the cable does not result in electric shock. The power supply voltage is too low for such shock to happen to a human, but it can cause electrical damage to the motherboard. It is always a safe procedure to work on any machine unpowered (both power supply and battery disconnected and/or removed).

In step 9, be sure to remember the direction that the original drive was pointing when removing. The new drive must point the same direction.

Nice tear down. I did notice the tiny pliers with blue handles. I believe that is from one of the Pocher 1/8 scale car kits, possibly from the Ferrari Testarossa tool kits. Obviously it is just for decoration!