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Polar M400 Watch USB Replacement Guide

Duration: 45 minutes

Steps: 4 Steps

Is your Polar M400 refusing to charge? Maybe the micro-USB connector has seen better days? And let’s face it, you don’t want to fork out 20€ (+ shipping) for a replacement from Polar, right? Not afraid of a little soldering and heat gun action? Then you’re in the right place!

Step 1

Polar M400 Watch micro-USB connector Replacement

– Let’s dive into this! Start by following the screen replacement guide to take apart your watch.

– Gently lift the screen off the board.

– Carefully detach the USB’s flex PCB from the main board. Save the red rubber seal from the USB connector for later.

Step 2

– Grab yourself a trusty helping hand tool to keep the USB connector steady—it’s like having an extra set of hands!

– Fire up your heat gun and aim it underneath the PCB, letting that warm air work its magic.

– Once the solder starts to melt, give the connector a solid tap and watch the PCB pop loose like a pro.

Tools Used

Heat Gun

Step 3

– Set the new USB connector down on a flat surface, making sure its pins are pointing up like little soldiers ready for action.

– Carefully place the PCB right on top of those pins, ensuring the shiny copper traces on the flex PCB are facing down towards the flat surface.

– Grab your soldering iron and get to work! Heat up all the pads at once (as best as you can) while applying a bit of pressure, so those USB connector pins can pop through like they own the place.

Step 4

– Now, simply follow these steps in reverse to put your device back together.

– Oops, didn’t quite finish? No worries, just hit cancel!

– If you’re feeling unsure or need a hand, you can always schedule a repair.

Success!

Ralph Harris

With over 20 years of experience in electronics repair and technical writing, this background reflects both expertise and dedication in the field. Credentials include a Bachelor’s degree in Computer Science from USM, more than 500 Apple repair certifications, and a Wise Level 2 Technician certification, spanning across the full spectrum of device and cell phone repair. More than 2000+ repair guides have been published on the company site, salvationrepair.com, with a focus on sustainability and reusability enabling even lay-men to repair devices that would have otherwise ended up at the county landfill.If you like this content and would like to see more like it - let us know! It only takes a second and getting to know our audience is the whole reason we do this. So don't be shy - shoot us a quick hi!