Difficulty

Difficult

Steps

4

Time Required

                          30 minutes

Sections

1

  • Micro-USB connector
  • 4 steps

Flags

2

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Introduction

What you need

Step 1

              Disconnecting the flex PCB
  • Follow the screen replacement tutorial to dismantle the watch.
  • Carefully lift the screen from the board.
  • Disconnect the USB’s flex PCB from the main board. Save the red rubber seal of the USB connector for later.

Follow the screen replacement tutorial to dismantle the watch.

Carefully lift the screen from the board.

Disconnect the USB’s flex PCB from the main board. Save the red rubber seal of the USB connector for later.

1024

Step 2

              Desoldering the USB connector
  • Use a tool like a helping hand to hold the USB connector part.
  • Using a heat gun, blow hot air underneath the PCB.
  • Once the solder is melting give the connector a good tap in order to make the PCB fall loose.

Use a tool like a helping hand to hold the USB connector part.

Using a heat gun, blow hot air underneath the PCB.

Once the solder is melting give the connector a good tap in order to make the PCB fall loose.

Step 3

              Soldering a new USB connector
  • Place the new USB connector on a flat surface with its pins pointing upwards.
  • Place the PCB on top on the pins, the exposed copper traces on the flex PCB facing the flat surface.
  • Using an iron, solder the PCB by heating all the pads at the same time (as much as possible) and apply pressure so that the pins of the USB connector come through.

Place the new USB connector on a flat surface with its pins pointing upwards.

Place the PCB on top on the pins, the exposed copper traces on the flex PCB facing the flat surface.

Using an iron, solder the PCB by heating all the pads at the same time (as much as possible) and apply pressure so that the pins of the USB connector come through.

Step 4

              Sealing the USB connector
  • Connect the flex PCB back to the main board.
  • Reassemble the watch stopping before screwing the lid back.
  • Add hot glue to the base of the USB connector filling the watch case’s cavity. Be careful not to put hot glue inside the connector.
  • While the glue is still hot, put the red rubber seal back on top.
  • Screw the lid back.

Connect the flex PCB back to the main board.

Reassemble the watch stopping before screwing the lid back.

Add hot glue to the base of the USB connector filling the watch case’s cavity. Be careful not to put hot glue inside the connector.

While the glue is still hot, put the red rubber seal back on top.

Screw the lid back.

To reassemble your device, follow these instructions in reverse order.

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                                                                                      5 other people completed this guide.

Author

                                      with 1 other contributor 


                    Benjamin Freeman

Member since: 01/16/2020

259 Reputation

                                      1 Guide authored                  



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martinmartinez644 - Apr 11, 2020

Reply

Sehr gute Beschreibung,

aber ich finde keine USB-Buchse für die M400 zu kaufen

Wo gibt’s die Teile?

Benjamin Freeman - Apr 14, 2020

Danke schön. Für den Konnektor allein habe ich auf Aliexpress gekauft : https://www.aliexpress.com/item/32960430…

Uhrin Szonja - Apr 14, 2020

Reply

https://www.aliexpress.com/item/40000875…

https://www.aliexpress.com/item/33036830…

Number : 3

Pankaj Singh - Oct 12, 2020

Reply

From where do I order usb connector?