Dyson V6 V7 SV03 DC62 SV10 32 red light flashes - planned obsolescence

[dvd4me]

Hello,

All over the internet the solution to fix the 32 red flashes on those batteries is... replace the battery!
So, after tinfever did some reverse engineering on those 32 red light flash error from the Dyson battery packs, analyzing the BMS form the V7 (SV11) and V6 (SV09) Dyson batteries, the conclusion is that the balancing was design to ... not happen on those packs, thus the reason of lock with 32 flashes. Planned obsolescence.
It’s this a joke when a company that claims to bring the finest of engineering in their products actually designs planned obsolescence in their battery product? Huh?

Solution to reset the lock has been found, read all the details of the hard work and contributors here:

https://www.eevblog.com/forum/reviews/dyson-v7-trigger-cordless-vacuum-teardown-of-battery-pack/msg3881375/#msg3881375

[SilverSolder]

The only defense is to not purchase products that feature planned obsolescence.

I recently bought a vacuum cleaner.  I made sure it had an AC power cord! 

[dvd4me]

The only defense is to not purchase products that feature planned obsolescence.

I recently bought a vacuum cleaner.  I made sure it had an AC power cord! 

Hello Silver,
I'm actually "saving" the planet one item at a time. My Dyson was proudly "retrieved" from the snowy snow... 
I will not spend money on things that I can find for free and fix, well maybe a small cost on the parts..
I like learning and fixing and sometimes even contributing...

Cheers

[Tangent_Tracker]

Not so much planned obsolescence, but definitely cost-cutting. i am not surprised with Dyson tbh, and it stinks. but remember this guy has never invented anything new, just adapted.

[tinfever]

Not so much planned obsolescence, but definitely cost-cutting. i am not surprised with Dyson tbh, and it stinks. but remember this guy has never invented anything new, just adapted.

I believe this is 100% intentional on their part. On the V6 (SV09) BMS boards, they even have the traces and pads for the balancing resistors, they just aren't populated. All they needed was 5x 220 Ohm 1/10th watt resistors which would have cost them in total about one cent.

If this was truly about cost, I feel like they wouldn't have implemented a fancy BMS IC with built-in balancing MOSFETs in the first place. They probably could have used a BMS IC without balancing FETs that also didn't require a separate microcontroller and saved a ton more cost by removing the uC.

On the later V7 (SV11) BMS board, they didn't even include the pads and traces for the balancing resistors and clearly miswired the BMS IC so the internal FETs were shorted out and could never be used. They did add a reed switch to the SV11 BMS to detect when the battery is removed from the vacuum, which I bet cost a whole lot more than one cent.

[DavidAlfa]

Actually 1w resistors, as you know they cost a fortune

[tinfever]

True. If you wanted to max out the ISL94208 at 200mA balancing per cell, you'd need bigger resistors.

I'd been assuming a low-budget scrappy startup like Dyson would just use the example application in the datasheet and use 200 Ohm or so resistors. Maybe we should give them the benefit of the doubt and they had to save 1.2 cents per unit over 10 million units so they could afford to pay the lone engineer they must have designing all their products. 

[SilverSolder]

It is pretty poor that there is no balancing, and a "dead man's switch" in the BMS.   Dyson seems to be a good candidate for some "right to repair" treatment...

[NeilP]

I have posted a new topic on these..not sure if a new topic or tagging on here or another post was the best thing to do ..so opted for a new post.


If any of you ladies and gents have the time , I'd appreciate any input on this

Thank you

https://www.eevblog.com/forum/repair/beginner-dyson-battery-question-sv03-sv05

[NeilP]

And yet another topic !  I have a question regarding the bonded thermistor, but have placed that in its own thread, to avoid burying the answers within a different topic.


If you have info I’d be grateful if you answered on that thread

https://www.eevblog.com/forum/repair/dyson-sv0305-battery-bms-thermistor

Thank you