Re: Help me identify this BMS component
I guess a more general question is:
What is this transformer exactly doing in this configuration? What is it’s purpose in this BMS?
In a working BMS, the low voltage circuit turns on when the battery gauge button is pressed, or when the battery is used in a tool or charged on the charger. When this circuit is activated, pin 1 of the transformer (bottom left in first photo) reads approx 55v, pin 2 reads approx 54v, pin 5 reads approx 3-5v and pin 6 approximately 3-5v. Pins 3-4 measure in the mVs.
braxton
Senior Member
Last Activity: 11-21-2023, 10:36 AM
Joined: 11-22-2009
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Re: Help me identify this BMS component
I noticed that, on the BMS board, the 3 coil symbols each has a (-) designation at one end, which would seem to indicate a polarity. How does this factor into identifying a suitable replacement part and installing that part?Leave a comment:
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Re: Help me identify this BMS component
Using my 9V generic electrical component tester, the 3 coils test as resistors (in circuit and bms powered down; in a working bms). Pins 1 and 2 are 8.2 ohms, pins 3 and 4 are 6.8 ohms and pins 5-6 are 5.4 ohms. I did not do any further testing at this time as these batteries are very expensive and i don't want to risk breaking a working BMS.
Do they need to be tested out of circuit?
My tool can measure inductance as I tried other choke coils and the transformer coil part i ordered from digikey and they tested as inductors...Last edited by braxton; 11-12-2023, 12:36 PM.Leave a comment:
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Re: Help me identify this BMS component
I unfortunately don't have any equipment to measure inductance
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Re: Help me identify this BMS component
I added wires to its pins so that it would connect properly to the pads on the boards, as its pinout was different. Pins 3-4 were correct but the others needed to be criss-crossed....Leave a comment:
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Re: Help me identify this BMS component
Thanks. I'm not enough of an expert to know what to look for.
Based on my second photo in the 1st post, I can see that pin 1 (bottom left) has a coil connecting to pin 2 next to it. Pin 3 has a coil connecting to pin 4 across from it. Pin 5 has a coil connecting to pin 6 (top left and middle pins).
I'm not sure how to interpret coil schematics in the datasheets to find a similar profile.Closest I could find was the pulse electronics device i linked to above, but it didn't work......Leave a comment:
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Re: Help me identify this BMS component
Lots seem to be looking but I can't find any sites that mention that someone has found anything yet. It might be a proprietary part made just for EGO bms??...Last edited by braxton; 11-11-2023, 05:35 PM.Leave a comment:
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Re: Help me identify this BMS component
For some reason this coil component is a common failure, especially in the newest ego batteries with the fuel gauge. One of the 3 coils tends to short or open up.
In my case, the 3 coils do not appear to be shorted or open, but resistance values differ slightly from working coils.
If I install a coil removed from a working BMS, it restores functionality....Leave a comment:
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Re: Help me identify this BMS component
I took a chance and ordered this coil from digikey:
[url]https://www.digikey.ca/en/products/detail/pulse-electronics/P0926NL/2265652[/url]
It looked similar and dimensions were correct. It had a slightly different pin out, but long story short, it did not work in this application.Re: Help me identify this BMS compon...and dimensionsLeave a comment:
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Re: Help me identify this BMS component
Here is an image of an older version of the BMS board with more labels:...Leave a comment:
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Re: Help me identify this BMS component
The two top connectors attach to the 14 cell packs (individual cell monitoring) plus wiring for two thermistors.
The bottom connector attaches to the battery contacts (negative and positive leads plus T terminal plus D terminal.
The coil in question is involved in the circuitry that drops 56v to lower voltages to drive the BMS (12v, 3.3V etc).
I can also attach another image of an older version of this BMS, which has more labels on the board.Last edited by braxton; 11-11-2023, 09:44 AM.Leave a comment:
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Help me identify this BMS component
Hi
I have 4 ego 56v power tool batteries where the BMS battery management board is dead. I believe I have narrowed down the problem on all 4 to a transformer coil on the board. There are no markings whatsoever on this coil. How would I go about trying to identify it? Thanks.
I'm attaching a couple of photos for starters. The first shows the entire board with the component in question (silver square 6pin device next to caps).
The second photo shows the board with the transformer coil removed.
Any help is greatly appreciated.... -
Re: Black and Decker 40V Lithium weed trimmer PCB board damage
Those contacts are soldered well on the opposite side of the board, and continuity from both sides of the board to the relevant connection points is good when tested with a multimeter.Leave a comment:
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Re: Black and Decker 40V Lithium weed trimmer PCB board damage
I tried to take better photos of the board.
I also measured all of the resistors on the board and all seem to give an ohms reading (Highest was 100K and none seem to be open as far as I can tell)....Leave a comment:
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Re: Black and Decker 40V Lithium weed trimmer PCB board damage
Replacing the 2 chips had no effect. Still dead.
What about this component (largest chip in the corner) in the attached photo?...Last edited by braxton; 08-13-2021, 05:43 PM.Leave a comment:
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Re: Black and Decker 40V Lithium weed trimmer PCB board damage
The sot23-5 chip is hard to read but it looks like GX3mD maybe?...Leave a comment:
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Re: Black and Decker 40V Lithium weed trimmer PCB board damage
R24 resistor has 753 written on it and tests at 75.5 Kohm...Leave a comment:
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Re: Black and Decker 40V Lithium weed trimmer PCB board damage
Thanks!
Ordered a few of those and the MBR20200CTP (200V instead of 100V)
Hopefully that will get the trimmer working again......Leave a comment:
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Re: Black and Decker 40V Lithium weed trimmer PCB board damage
Based on a closer look at the blown chip, it looks like it is an Infineon IRL3705Z mosfet.
Digikey lists it as obsolete.
Can anyone help out finding this part or an equivalent?
Thanks.Leave a comment:
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Re: Black and Decker 40V Lithium weed trimmer PCB board damage
Here are photos of the trimmer with the model number.
The board is from inside the handle part.
The board is not from the battery itself....Leave a comment:
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