I wonder why these handhelds are not popular. Is it due to their unreliability?
Dyson offer a five year guarantee on most of their machines, and only two years on those. Also, they are expensive (a DC35 retails at £230) and the only run for 15 minutes at best. Six on boost mode.
We don't sell them for that reason and that spares supply is quite limited.
I am not saying it definitely is the PCB, its hard to diagnose one at a distance. It could be something as simple as a dodgy connection.