Dyson Up15 Brushbar Not Working - Faulty PCB?

[Futra]

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Hi, I have just bought an Up15 with faulty brushbar - and thinking that the PCB is faulty, but would appreciate another opinion?

I've stripped it down and tested the yoke loom, switches and power cable and put 240v AC through the brushbar which sort of worked, but I'm only getting 7v DC from the PCB - and from what I've read it should be around 300v to the brushbar?

Is there anything else I should check before going ahead and replacing the PCB?

Many thanks!

[macman]

Did you test with the machine reclined? The brushroll only gets power when it is.
If you bypassed the PCB entirely and fed 240V AC direct to the brushbar motor, then it may now be toast: it's a DC motor.

[MVacs]

If you bypassed the PCB entirely and fed 240V AC direct to the brushbar motor, then it may now be toast: it's a DC motor.

I agree. You may now need to replace both. One can take out the other anyway.

[Futra]

Hi, further to my original post, I ordered an UP15 PCB which I received earlier this week and fitted, the brush bar is still not working and I'm now thinking that the replacement one has a similar fault, unless anyone can point me to another component that might have failed?

With my original PCB there was no power at all to the brush head connector pins. With the replacement one there is voltage to the brush head connectors when the brush head isn't actually fitted, but when it is fitted the brush head instantly moves a fraction when switched on then stops, so there seems to be no power output under load.

I've tested the wiring from the PCB to the motor head - and when I directly put 12v dc into the brush head output connector via the soldered joints on the on the back of the PCB, the motor head slowly spins - so the wiring loom, connectors on the PCB and motor head seem to be OK.

I've also tested the power switches themselves near the handle and the wiring between the switches and the PCB. The main vacuum motor works as it should.

Does anyone know if there is anything else that could stop the motor head working, or is it likely that I've replaced one faulty PCB with another?

Thanks

[MVacs]

I ordered an UP15 PCB

Did you order a new one or a used one?

What is the DC output from the PCB at the PCB?

[Futra]

Hi, it was a used one - I'm only getting 4v DC!!! The motor head definitely works. Is there any component other than the PCB that could be at fault? Thanks 

[MVacs]

If you have 220v AC going into the PCB and 4v DC coming out, it's faulty.