| Electronics > Repair |
| Repairing a Bicycle battery |
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| fant:
Good morning; I am trying to repair a BMS for a bicycle battery where a component is missing. Anybody has the same board so to know the characteristics of the component or at least a datasheet of the protecting IC (OZ7714CN)? The open voltage of the battery is 48V, but no power on output. Thank you in advance |
| Greybeard:
Datasheet: http://www.o2micro.com/products/O2%20807&G807C%20Product%20Catalog%202023-6-26(final).pdf Problem: Your IC is SOIC24, datasheet shows QFN28, so pin numbers are not matching. |
| fant:
Good morning; thank you for the link, but I had already seen it and discarded due to the pin count difference. I can find some spare on aliexpress, but before changing it, I would like to make some circuit investigation. Anyway, again thank you for the search and time spent. If anybody has new info, will be very appreciated Best regards |
| indeterminate:
At a wild guess it will be the Bat 1 pin of the ic so the missing component will be another 100 ohm resister |
| fant:
Thank you "indeterminate". I did it, but it begun to heat up. Tested, the voltage difference between pins is 3,7 - 3,8 V (probably the firs element of the battery pack), so I've tried with a 0,1 uF and second test with a 1 nF capacitor, but no result. I am beginning to think that that it is locked into the anti-theft function, even if the battery belongs to a friend of mine and therefore I know that the origin is legal and he assured me that there is no switch or key on the battery for this function. Continuing to dig. Thanks to everybody |
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