I have cooked the charging circuit for a sealed lead acid battery by accidently attaching a 15V supply for another device instead of the 12V supply that it was expecting.
Now, when I plug in the correct DC power supply, the red charge LED lights briefly, then the relay clicks and the red charge LED goes out. The relay remains switched until the DC power is removed, it doesn’t charge the sealed lead acid battery, which is deeply discharged...
I have attached a photo of the charging cct board.
My best guess is that I have killed the transistor, and that it is just a case of replacing it. It is marked S9013 H 331... Is any transistor marked S9013H a suitable alternative?
The only other thing that looks killable is the little orange diode it has a big blue black ring and the number 2 there may be additional markings on the underside...I can de-solder if it is a suspect and you can’t guess what it is.
Both electrolytics are marked 4 7µf 25V (I don’t know whether the space is supposed to indicate a decimal) but am guessing these are ok as they are rated above my applied voltage.
The black diode is marked, 66*N I can’t read the * because of the way the diode is soldered, there may not be a character at all, I can de-solder it if you think it is a suspect.
I haven't done any electronics since A-Level physics, so if somebody can guess what or which bits are most likely to be damaged I would be eternally grateful. I am worried that the longer the lead acid is discharged the less likely it is to take a charge again.
Kind regards, Carl
Now, when I plug in the correct DC power supply, the red charge LED lights briefly, then the relay clicks and the red charge LED goes out. The relay remains switched until the DC power is removed, it doesn’t charge the sealed lead acid battery, which is deeply discharged...
I have attached a photo of the charging cct board.
My best guess is that I have killed the transistor, and that it is just a case of replacing it. It is marked S9013 H 331... Is any transistor marked S9013H a suitable alternative?
The only other thing that looks killable is the little orange diode it has a big blue black ring and the number 2 there may be additional markings on the underside...I can de-solder if it is a suspect and you can’t guess what it is.
Both electrolytics are marked 4 7µf 25V (I don’t know whether the space is supposed to indicate a decimal) but am guessing these are ok as they are rated above my applied voltage.
The black diode is marked, 66*N I can’t read the * because of the way the diode is soldered, there may not be a character at all, I can de-solder it if you think it is a suspect.
I haven't done any electronics since A-Level physics, so if somebody can guess what or which bits are most likely to be damaged I would be eternally grateful. I am worried that the longer the lead acid is discharged the less likely it is to take a charge again.
Kind regards, Carl