How to fix a Dyson v6 v8 battery fault red flashing led diagnose fault and repair not charging

In this video we look at a Dyson v6 or v8 battery that shows the red flashing led and won't charge.
instead of just buying a new battery pack and swapping it out we see if we can repair the currant battery pack.
Taking apart a battery pack from a Dyson v6 or v8 dc59 and finding out why its flashing a red led and how to repair the battery pack.

get a new battery here be aware there are type a and b for most dyson models.
check out my other videos to see how to replace the battery and make sure you Order the correct one.

dyson v8 type A

dyson v6 type A

dyson v7 type a

dc31 type A

v8 battery with screw driver and replacement filter

new charger
original dyson part

cheaper alternative
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please use these to purchase your items. thanks

I show you how to open the battery and I check all the batteries one by one to make sure none are faulty and need replacing. then I test everything else to discover the battery management board is faulty and I ordered another from Ali Express.
#dyson
#dysonvacuum

0:00 Introduction
0:01 Dyson battery red led flashing Strip down and diagnose for repair
0:07 This battery pack is flashing the red led 32 times. lets see if we can fix it.
0:13 torx screw needs removing
0:30 6 clips in total holding this together.
1:05 Just take your time with this step.
2:38 Remove this torx screw.
3:34 now you can see the 6 lithium iron batteries, theres are 18650 size and easy to get hold of.
4:17 The swatch is just pushed on plastic pegs
5:32 so now we look at the PCB charging board.
5:58 I cant see any obvious faults
6:30 Lets test it with the charger fitted now.
6:49 no red or blue lights with the charger fitted, looks to be a PCB fault.
7:43 Testing the outputs when charging there is voltage, when the led flashes.
7:57 there should be about 20volts on the outputs
10:50 Another charger to test one I know works.
12:08 Just trying it again but no luck.
12:42 These two match up.
12:48 And theses two
13:00 there is a fault with this board.
13:17 I try heating up the board hoping that the solder will reflow if theres a bad joint
13:54 but theres a varnish to waterproof the board and this burns.

[randycollens]

Brutal job. You diagnosed nothing, and fixed nothing.

[aliwong]

You only dissamble the battery, no diagnosis, no repair, I am disappointed.

[chrisklimko]

You need to set your DMM to 200V (its on 20V) in order to test the charging cable. The unloaded voltage from the charger is in excess of 20V, which is your meter's current setting, so the voltage goes out of range. That's why when you try to check the charger cord voltage it shows (briefly) 19.xx V, then shows the digit '1.' Cheap multimeters are annoying. Also, the varnish that cooked up on the PCB is likely conformal coating, often used to make PCBs slightly moisture proof. Thank you for the video, demonstrated that Dyson electronics are basically junk and convinced me that I should simply get a new complete battery and use my old 18650 cells for something else.

[andyharris]

Fair play - unlike some videos that gloss over the difficult bits at least this one showed that this was not a simple operation for the average DIYer - at least persuaded me not to try! Thank you

[aletavanvuuren]

Explaining what you are doing would help

[krzysztofkaisats]

Thank you for showing how to remove the battery. You helped me a lot.

[tyronenelson]

The bms board bricks itself in a fault condition or on loss of power, and it cannot be reset, the problem is a lot of other people posting videos on youtube about changing the cells fail or don't want to mention this.

[johnshen]

Just wasted time to watch it till the end 😂

[mimrans]

Hi thanks for sharing
Where is the next fix bord reparing?

[Andral_Premier]

HAHAHA! Je vous applaudis chaleureusement. 👏👏👏 Omedeto gozaimasu, Anata wa ichiban desu ! 👍👍👍😂

[Michel-Artois]

These Dyson BMS are a shame. Usual BMS stop current with faulty cell or global too low voltage, but never lock down definitively like these ones . If the battery is still good but with weak cells and you want to change them, when you disconnect this BMS without any other power source to maintain it alive, it's exactly the same.... and programmed lock down after X recharges is also the same...
it's a legal robbery for pure commercial reasons, masked by an efficient (and fragile) technology and wrong arguments ! Why is it not forbidden??
My Panasonic E-bike battery does exactly the same ...it's the new "Lithium robbery" now applied to a lot of other devices by clever manufacturers.

[AlainMazy]

On my Dyson V6, the battery flashes red !! but sometimes it kicks off and the led is blue, if I release the trigger, then press it again, it still works well! if I leave it inactive for too long (+/- 30 sec) it flashes red again! and trying a few times it reboots correctly, every time like this i have a hard time knowing if the problem is with the battery (maybe BMS) or if it's the motor.
In your opinion?

[杨益-se]

You should swtich to the range 200v to check the voltage

[scanrouter]

My DC45 does not charge when the Dyson with battery is in the wall holder. But when I take the battery out and connect it directly to the charger plug, the battery is charging! After some time, when the battery is fully charged, I put it back in the Dyson, and I can use the Dyson for the normal use time. The battery is brandnew from Amazon. What can I do to solve this problem?

[louisavanyzendoorn]

Can you just imagine what it takes and how frustrating for a housewife

[liamtheurchin]

In my experience there is no fault with the board. It has detected some kind of issue with the cells and has deliberately insolated the power from the cells. You can charge the cells to 4.0v each with a stand alone charger and you can even measure a good voltage coming off the center posts but there are no amps so no power. Once the board decides to cut the power you cannot it seems 'reset' it. Although it is only a control board and not magic I still haven't found anybody/info on how it does this or how to reset it. If you did get a new pcb I would think it will see the same tiny issue with the cells and cut the power in the same way?

[notetee]

The red light means a low voltage triggered the lock down of the board, no one found a way to unlock it. The board works well just got locked by the pic16 controller.
Normally happen with a weak battery and uneven cell voltage
I'm guessing the pic eeprom store that a low voltage happened and lock down, even if u pull reset pin low on the pic16, it will still be locked....
Probably from factory, after first code run on the pic, 1bit on eeprom to indicate initialise code ran and after a power out or a balance fault occur, no matter what you do the pic just flash red and that's how Dyson earn your money.... You won't be able to change the battery cell out once it flash red.
From what I found, you need to have another battery attached to each balance tab and then remove the old battery and spot weld a new one, not breaking battery power

[davidreynolds]

Is the outer plastic glued? Thermally attached or just snapped together? Speaking would be helpful

[empathicallyyours]

What is the power supply's output voltage?

[jimmikus]

That’s a lot of trouble to find out it’s still broken. A new battery is 16.00. And the fact you have no audio makes this waste of time video even worse. That’s assuming the average person understood what you were doing. You are not smart and wasted everyone’s time.