Disassembling the Garmin vivosmart wristband

jj1989

Disassembling the Garmin vivosmart wristband [Copy link]

 

Admin @eric_wang said that his colleague had a broken screen on a Garmin vivosmart bracelet, and was going to give it to a forum friend for research. Seeing that it was a Garmin product, it should support ANT+ devices, so he got it back.

Let's unbox it. It's still new, with all accessories.

Figure 1

Figure 2

Judging from the logo on the inside, it supports Bluetooth and ANT+.

Figure 3

Try charging first, the screen lights up, as shown in the picture, indicating that it is charging.

Figure 4

The screen is indeed broken, and it can only be replaced. But this is the first generation of vivosmart, and it is now the fourth generation, and there are no accessories on Taobao. So take it apart and look at the internal structure. Try connecting with Bluetooth before taking it apart. You need to enter the pairing code, and the bracelet screen will display the pairing code, but because the screen is broken, the pairing code is not fully displayed and cannot be connected.

Figure 5

This should be the current time displayed.

Figure 6

The screen on the right side of the last zero is completely broken. The screen supports touch and can be operated by sliding. Next, disassemble the machine. It is very simple to disassemble. A flat-blade screwdriver can do it. It is glued.

Figure 7

The position of prying is not selected well. It is pried from the FPC side, causing the FPC seat to fall off directly from the PCB. This should be the touch cable, and the other is the screen cable. Next, take a look at the circuit board.

Figure 8

Figure 9

The PCB is divided into three parts, which are connected through the FPC. The main control screen is M25P8V, which is Freescale's MKL26Z256VMP4, Cortex-M0+ core, 256KB Flash, 48MHz, USB, MAPBGA 64. The wireless solution uses Nordic's NRF51422, which supports both BLE and ANT. The power management uses MAX14676B. The RF antenna is on the side, and the FPC antenna is used. The battery is under the PCB, and there is also a vibration motor. The whole design is very compact and the workmanship is very good. Next, I will prepare to restore it, and plan to solder the detached FPC socket on first. Unfortunately, the temperature of the soldering iron is a bit high, and the socket is deformed immediately. I can only wait until there is a suitable socket later to try again. This disassembly ends here. Thanks to the selfless dedication of the EE staff.