Bose QuietComfort 35 Repairing the power button slider Replacement

These Bose headphones have a power slider on the bottom shell in the picture. After 3 or so years, the slider no longer engages, and after disassembly it can be seen that a part of the slider has broken off. This can be fixed with glue and a heat-shrink tube.

... as seen on Youtube: remove the earpads by gently pulling, they are held in place by clips.

Then remove the cloth; it has been glued, but can be pried off. Opening a single edge is sufficient to find the three screws.

Minor tears are no concern; in this case when reassembling, double sided sticky tape has been used.

The shell is held in place by three phillips screws, see photos. Then the shell at the back can gently be pried off.

it may be helpful to use tape to pull the shell. Whilst opening, the power slide and the bit that broke of fell out.

Glueing the broken part in place with instant glue restores the shape; here an additional heat shrink tube has been added for extra strength.

Gently heat the tube so that it pulls the part in place.

Also, the instant gluemade the opening a bit more narrow than original, so some smal torx have been used to widen the hole a bit. A very small drill would work as well.

Place the sider back, where the knop is oriented towards the centre of the headphone shell.