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Introduction

If the V800 barometer/altimeter measurement starts to behave erratically you can start by following Polar recommendations: calibration, watch restart, watch cleaning, sensor entry cleaning (see https://www.youtube.com/watch?v=pZslSi8h...), contact the polar support team (they may provide you with a 30% discount for a new watch that could be useful if you destroy the V800 :-)).

If these steps do not solve the problem and in particular if:

- you get a watch freeze (only a restart of the watch solves it) when you try a calibration

- no altitude displayed

then the barometer sensor may be out of service.

Beware, it is not an easy fix, you can make your watch unusable.

  1. Polar V800 Barometer/Altimeter Replacement, Opening of the watch case: step 1, image 1 of 1
  2. Polar V800 Barometer/Altimeter Replacement, Mother board disassembly: step 2, image 1 of 1
  3. Polar V800 Barometer/Altimeter Replacement: step 3, image 1 of 3 Polar V800 Barometer/Altimeter Replacement: step 3, image 2 of 3 Polar V800 Barometer/Altimeter Replacement: step 3, image 3 of 3
    • Remove the red seal around the sensor using a small flat screw driver or anglet pliers

    • The sensor is strongly glued and welded on the mother board. Beware of the micro components positioned nearby, avoid taking support on them when removing the seal.

    • Unsolder or cut short the black/red wires soldered on the casing.

  4. Polar V800 Barometer/Altimeter Replacement: step 4, image 1 of 1
    • A blue dot allows the good position/orientation of the component. Take note of the position of this dot prior removing the faulty component.

    • Component ref MS580502BA01-50

  5. Polar V800 Barometer/Altimeter Replacement: step 5, image 1 of 3 Polar V800 Barometer/Altimeter Replacement: step 5, image 2 of 3 Polar V800 Barometer/Altimeter Replacement: step 5, image 3 of 3
    • With a 350°C soldering iron and a desoldering wick remove as much solder as possible. Then try to remove the component with angled pliers

    • It is likely that the component wont come out (solder below it + component glued to the board). The only solution that I've found was to cut to pieces the component with mini cutting pliers.

    • The target is to get a somewhat clean and flat surface where to put the new component while keeping the soldering pads and without destroying nearbie components. That is the most complex operation.

  6. Polar V800 Barometer/Altimeter Replacement: step 6, image 1 of 1
    • Put a VERY SMALL drop of glue (no cyanoacrylate, use a glue that solidifies slower like epoxy so that you can correct misplacement of the component) in the component placement area and put it in there (take care to place the component so that the blue dot is at the right position!)

    • Solder the 4 contacts with a thin head soldering iron. The use of flux will probably help since the solders are very small.

Conclusion

Follow instruction in reverse order to assemble the device. Do not forget to resolder the black/red wires to the casing.

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Alexandre Moulart

Member since: 08/17/2022

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