In the summer prime sale at Amazon we purchased a third generation Amazon Echo Dot which is a small voice-controlled speaker using Amazon’s Alexa voice command service. Part Two of this post is on Echo Dot 3rd Gen Digging Deeper.
As this is the first Amazon echo dot device we have purchased, we decided to take it apart to see what you get for your £22.00.
In the Box
- The echo dot
- 240V UK power supply
- Things to try leaflet
- Setup instructions
Top of the Echo
The top of the echo dot has four buttons, four microphones and an LED ring. The + and – buttons control the volume, the white circle activates Alexa and the circle with a line through it enables or disables the microphones.
The base has the serial number, product logos and certification marks.
On the side is a power input socket and headphone / audio out 3.5mm stereo socket.
Case Base with sticky foot removed
The cover is held in place using adhesive tape and four plastic locator pins.
To open the case first you need to remove the non-slip cover on the base of the echo dot, using a thin knife or some other flat bladed tool.
Under the cover you will find four torx bolts and a recessed six pin header which appears to be a debug or programming port.
Removing the four torx bolts allows you to remove the plastic base.
Metal Chassis with Processor PCB and speaker
Inside you will find a circuit board and the internal speaker.
The underside of the PCB contains discrete components and several test points.
The base PCB is removed using three torx bolts and the removal of a small flat-flex cable. The four bolts that hold the power and headphone connectors down do not need to be removed.
Metal Chassis with Speaker
The Metal chassis contains the speaker and a plastic moulding for the speaker. The plastic is glued to the metal chassis, so we did not try to remove this.
There are four recessed torx bolts which hold the top panel to metal chassis.
Removing these allows you to remove the top PCB and button panel.
The processor PCB houses the power input jack and a headphone / audio out port via a 3.5mm stereo headphone plug. There is a shielded section which houses the main processor and memory IC’s.
The board also contains power regulation and the audio driver for the internal speaker which is a TAS2770 from Texas Instruments.
Processor PCB with shielding removed
The metal shield can be removed using a small screwdriver. Under the shield you will find the Echo Dots main CPU and Flash memory.
The Echo Dot uses a Mediatek MT8516BAAA Quad-core, 64-bit ARM® Cortex-A35 MPCore processor.
Next to the processor is a Samsung KMFN60012M-B214 8GB eMMC memory chip.
Top PCB with White Plastic surround
The top PCB can be removed from the white plastic ring and top cover by removing the four silver torx bolts.
Top PCB with buttons
The top of the PCB contains four buttons, two LEDs and a light sensor.
The LEDs are placed on either side of the button which toggles the microphones on and off. The light sensor controls the brightness of the LED ring array.
Top PCB with Shielding removed
The underside of the top PCB contains most of the components found inside the Echo Dot. An array of 12 RGB leds is located around the edge of the board. The LEDs are driven using an ISSI IS31FL3236 36 channel LED driver.
Four microphones are placed next to the buttons and these feed into two TLV320ADC3101 chips from Texas Instruments. The TLV320ADC3101 is a Stereo ADC with an embedded mini digital signal processor. The Echo dot uses the four microphones to locate the direction the voice is coming from and filter out background noise.
In the centre of the PCB is a metal shield. Under the shield you will find a MediaTek MT7658CSN dual-band Wi-Fi and Bluetooth controller with an ARM Cortex-R4 CPU. The MT7658CSN manages communication to wi-fi and Bluetooth devices and connects to two PCB antennas located on the outer edges of the board.
There is also a Fairchild 74LCX74 dual D-Type flip-flop which appears to switch the microphones on and off.
The top of the metal chassis.
All internal parts
All of the internal parts which make up the echo dot.
29 July 2019 at 1:38 pm
Nice teardown. Is there a part number for the speaker driver?
29 July 2019 at 2:00 pm
Joe, the speaker driver is a TAS2770 from Texas Instruments. I have updated the post with the driver info
30 July 2019 at 7:33 pm
Very interesting, awesome pics btw!
31 July 2019 at 4:55 pm
Is there a part number for the microphone? This is some great work with the teardown; I want to copy the "light up where the sound is coming from" direction-finding functionality of the Echo
31 July 2019 at 5:19 pm
Andrew, the number on the microphones is UY19 2WO7. I havent been able to find anything online for this part number.
02 August 2019 at 7:38 am
What’s the WiFi and Bluetooth chip used? Is it from marvel ?
09 August 2019 at 5:50 pm
I hope the flip flop proves that if we switch off the mics, the software can not switch it on by itself, even after a reboot and it remains true that if muted, it will not feed mic data to anybody(amazon or a hacker).
10 November 2019 at 7:04 pm
My Echo dot 3rd gen is not searching my "My Air Purifier 2s" of Xiaomi through"Mi Home" app. It says device is not found, whereas Mi Home app is working properly with my device.
Some random guy
19 November 2019 at 7:41 pm
Speaker driver : Fg-4040E1-3B
26 November 2019 at 10:12 pm
Has anyone measured the voltage of the LED lights?
29 November 2019 at 11:33 pm
If I removed the 4 microphones would it still function? ie. play music from another echo which is controlling it from another room. I'm trying to TOTALLY remove listening possibility for a few of my networked units.
30 November 2019 at 10:58 pm
I think not... probably at boot the device checks for hardware integrity... What are you doing that no one can have a chance to hear?
04 December 2019 at 1:53 pm
Dave, I came here to ask that exact question. Looks like it’s impossible, though I’m thinking it might be possible to fill them with superglue - that way electronic checks might still work but they won’t be able to “hear”
16 December 2019 at 10:58 am
Doesn't look like it's using digital microphones (could be wrong, it's not easy to tell from the pictures) they look like fairly 'standard' electret elements which should be fairly simple to disconnect (might need a track cutting per element) and the disconnection would be undetectable (unless Alexa is constantly listening for background noise to ensure hardware integrity which is rather disturbing)
Paul D Williams
24 December 2019 at 11:51 pm
Do you happen to know the part number for the tweeter for the 3rd gen Echo Dot? Having a hard time finding any information online. Trying to buy replacement part
25 December 2019 at 11:06 am
Paul D Williams, I am sorry but i dont know the part number
16 January 2020 at 11:45 pm
I wish in future echo dot will have internal battery.
18 January 2020 at 6:06 pm
My speaker is distorted. Amazon won't take it back, I want to replace the speaker what do I order?
22 January 2020 at 12:58 am
is there any resources I could find to get a replacement board with the aux and power in?
13 February 2020 at 10:10 pm
Can all components on the boards be colour coded to identify where each one is? Thanks
Paul F Brown
22 February 2020 at 11:46 am
I have vision limitations. Can anyone tell me the size of the led clock on echo dot 3 please
23 February 2020 at 5:35 am
Hello: I have a big problem, my amazon echo is dead, i followed your teardown and inspecting the processor board, I found burned the component U23, do you have idea what kind of component is? MOSFET, Regulator, driver, or something else?, I realy need your help.
23 February 2020 at 10:24 am
Carl, U23 part number is 02=45R It looks like some sort of voltage regulator but we dont know the output voltage.
07 March 2020 at 3:32 am
Thank you for the pictorial tour of the echo dot. Does it appear to be possible to add a line in port?
09 March 2020 at 4:02 pm
Echo dot speaker is very distorted, anyone know where to get a replacement? Thank you.
17 March 2020 at 10:17 am
@EJH: If you're lucky, the distortion is just because of some mechanical issues in the loudspeaker (for instance there's a metal part which entered the housing and is being hold by the loudspeaker magnet and which presses on the membrane of the speaker itself). Good luck!
28 March 2020 at 2:23 pm
There does not appear to be a battery. I am quite surprised as I would think Amazon would like to continue listening even when the device is unplugged. For their product development of course. Can anyone confirm that there is no battery.
13 April 2020 at 2:57 pm
What type of microphone is used? Analog or Digital? From numbers on microphone, unable to get microphone details.
20 April 2020 at 5:55 am
I've searched a many of forums with ZERO answer besides exchange/purchasing a new device - I'm wondering if there is an answer before taking apart or what to look for when I do. Echo dot 3rd gen will not enter setup mode. Tried everything under the sun including trying my roommates cord for theirs, waiting 5 minutes, rebooting router, de/re- registering, and obviously holding action button for at least 25 seconds, etc. Instead of turning orange it turns solid blue indefinitely. I promise I've tried all troubleshooting techniques given, and then some. Thank you in advance for your time!
01 May 2020 at 3:37 am
can you see how the audio out jack is wired for stereo and the speaker for both L & R channels? Is it the same audio feeding both or is it separated in chip? Is the speaker cutoff a mechanical contact in the audio jack or is that on chip? I am looking for a way to have both speaker and headphones simultaneously.
11 May 2020 at 6:39 am
What's the speaker part number and where can I get a replacement one? As EJH stated earlier "Echo dot speaker is very distorted". Thank you.
Mark E Wright
17 May 2020 at 10:23 pm
Can you confirm on the size of the torx screws? Thx
18 May 2020 at 9:46 am
Mark E Wright, I am sorry but I dont remember the size of the torx screws. Our driver set has had a lot of use and the sizes have all worn away from the handles.
31 May 2020 at 8:44 am
what's the top part called? the one with the buttons and top cover
11 June 2020 at 9:29 pm
Anyone knows the power dissipation of of the Mediatek MT8516BAAA Quad-core, 64-bit ARM® Cortex-A35 MPCore processor
16 July 2020 at 5:46 pm
Where is the DAC? Integrated into the TAS2770?
24 August 2020 at 2:57 pm
Do you know a part number to replace the top ribbon?
02 September 2020 at 2:26 am
What is the purpose of the dot and diagonal line button. I have a problem hearing Alexa
21 September 2020 at 8:57 pm
The circle with the diagonal line is to mute the microphone, when active the colored leds turn red
21 October 2020 at 2:11 pm
Does anyone know what the music power in watts is the Amazon Echo Dot 3rd gen
17 November 2020 at 1:03 am
Does anyone know where to buy the speaker driver
26 November 2020 at 10:08 am
Torx screw size is T6
02 December 2020 at 7:33 am
Thanks for excellent review. Could you let me know which DAC chip is used
27 December 2020 at 4:10 pm
Thanks for excellent review. Could you show led plastic ring back side .
21 January 2021 at 5:29 pm
Hi, if one of these is getting hot and non-functional, do you think a Raspberry PI could be put in and use the speaker and power port for a headless RPI?
26 January 2021 at 6:10 pm
Hello, is it possible to replace the flat cable holder on the first board? It seems mine is broken, as the cable doesn't hold good anymore and Alexa won't turn on. Thanks!
28 January 2021 at 1:43 pm
Can you fit a raspberry pi 4 inside the case whilst retaining the speaker
05 February 2021 at 9:33 am
Everything is here apart from what are the buttons for ?
08 February 2021 at 5:21 am
Donde puedo comprar la placa del centro de carga y audio al parecer la de mi E3 se quemo debido a una variación de voltaje, o creen q sea posible q se haya protejido debido a q recibió una variacion de voltaje. Por favor que alguien me ayude.
02 March 2021 at 3:01 pm
Where can I find a DC Output Power Plug for the 3rd Gen. The device does NOT have a Standard DC Plug-in port, (it’s close but not close enough) I would like to make a 12 V mobile power cord.
11 March 2021 at 12:00 pm
Hello, I was looking to replace the small flat-flex cable with a longer one. Do you know where can I find it and what is the name?
Luiz Gustavo juk
17 March 2021 at 10:05 pm
Onde eu posso encontrar o alto-falante da lexa geração 3
Where can I find the alexa generation 3 speaker
24 March 2021 at 8:37 pm
Hi Brian, my gen 3 dot is "stuck with blue ring and will not factory reset using various reset instructions. It never goes orange, I've tried all the tricks and tips. So I am wondering if I tear it open like you have do you think that could help in some crazy way? Other than a bad chip on the pcb I wasn't sure if I could try something at that level that might work. Any thoughts?
13 August 2021 at 1:46 pm
I am looking for a replacement ribbon cable. Any ideas where I could get that part?
15 August 2021 at 8:34 pm
I want to mount on the ceiling, therefore do you think I should be able to re-route the power cable/socket?
15 August 2021 at 8:50 pm
Ian, it should be possible to attach power cables inside the case and drill a hole in the base to have the cable exit for mounting on the ceiling
28 September 2021 at 11:20 am
I've the same issue Ian Lewis has. any hints?
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