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Dyson v7 Trigger cordless vacuum - TEARDOWN of battery pack

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PavChu:
Hello everyone, thank you for participating in this forum, especially the author of the custom firmware (FU-DYSON-BMS) and his colleagues and inspirers. This allows many people to solve their problems with batteries, as well as reduce the number of used batteries in the trash.
I want to ask the guys. Can PICkit 3.0 (when properly connected according to thewiring diagram) automatically not detect PIC16LF1847 on the 61462 PCB and the 188002 PCB. There are two non-working ones. The EEPROM is also not displayed in both cases. When the voltage is applied via PICkit 3.0 to a PCB that is not connected to the power elements, the indicator light reacts and changes color when the voltage changes from 2.5 to 5.0 V. When connecting the PCB to the elements, the LED indicator does not react in any way. I thought maybe the PIC16FLF1847 is just disabled somehow, maybe with MPLABX? In any case, Dzyakuyu syabry!

tinfever:

--- Quote from: PavChu on March 24, 2023, 07:00:36 pm ---Hello everyone, thank you for participating in this forum, especially the author of the custom firmware (FU-DYSON-BMS) and his colleagues and inspirers. This allows many people to solve their problems with batteries, as well as reduce the number of used batteries in the trash.
I want to ask the guys. Can PICkit 3.0 (when properly connected according to thewiring diagram) automatically not detect PIC16LF1847 on the 61462 PCB and the 188002 PCB. There are two non-working ones. The EEPROM is also not displayed in both cases. When the voltage is applied via PICkit 3.0 to a PCB that is not connected to the power elements, the indicator light reacts and changes color when the voltage changes from 2.5 to 5.0 V. When connecting the PCB to the elements, the LED indicator does not react in any way. I thought maybe the PIC16FLF1847 is just disabled somehow, maybe with MPLABX? In any case, Dzyakuyu syabry!

--- End quote ---

The latest recommendation is to not power the board with the PICKit and to leave the VCC wire disconnected. The battery should be able to power itself by pressing the button and applying a magnet to the reed switch if applicable. The PIC is a 3.3V version so you definitely shouldn't supply 5V. Any working board should be auto detected by the PICKit software I believe.

PavChu:
I got you, Tinfever! Thank you sincerely  :-+

rulof:
I have two dyson v10- sv17 batteries.
one is fully functional,
the other is blocked.
the atasamd20e15 processor is installed.
there is a programmer j link v9.
when connected, he wants to erase the firmware.
tell me is it possible to read and flash only eeprom?
by analogy with dyson v7-v8?

deuteron:
Dear Alll,
first of all many many thanks to all, who have contributed to this extremely interesting thread ! The work of tinfever & co is absolutely marvelous ! I read the thread from the very beginning since I'm a 'proud' owner of a Dyson V8 (SV10). The device was sold with a working battery, but the preowner said it is running only about 20 min with the actual battery. After having learned so much about the interior of the dyson batteries, I was curious to examine mine in more detail too. I'm not planning to 'repair' the pack or to change the cells, it's just that I wanted to now what's wrong. So I drilled alltogether 12 holes in the two side walls of the casing to be able to measure the individual cell voltages. Against my suspicion the pack is balanced pretty well, showing voltage between 4.07 and 4.12 V with an average of 4.10 V  in the completely charged state, i.e. the charger stopped charging, all LEDs off. After all investigations done by various people about this batteries this behaviour was unexpected, at least to me. My imagination was so far that the charger charges the cells until the highest of them reaches 4.2 V, the unsual maximum voltage of Li ion cells. Ok, it's not much of a capacity which is unused in my case (got 24.5 instead of 25.2 V max). Nevertheless it looks like the charger doesn't use the full cell capacities. What do you think, could this be a fault from factoty, some bad adjustment of the parameters or even a 'feature' to sell faster and more batteries ?
What's your opinion ? Did you see such an behaviour in your battery packs too ?
Best regards
Stefan

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