Looking to replace this part to fix multiple 12V ratchet battery packs with the same burnt out area on this component mosts likely a transistor for a voltage regulator charging circuit. Best effort possible part numbers: H19265, or H19285, or H19205, other marking KS Hb01, possibly a 3— something numbers/letters over the burnt out circle. It has 3 male pins and top solders directly to board for apparent heat sinking? Appears to be some form of power transistor. any guesses as to what this is, any ohm readings are invalid due to burn out of component. Ratchet 12v battery pack will not charge even with proven good 3.7 volt lithium batteries…did work fine, disassembly indicates this part as the primary culprit. Thanks for any help!
Hi, a1properties69.
It could be any of these transistors.
We need to know exactly what numbers stand for 3???.
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Adam7 has definitely narrowed it down, but he’s right, we need to identify the last few digits of the model number to find out which of these is a match. Alternatively, if you have any kind of background information on the circuit? If we could pin down the constant current rating for this it would probably be enough to take a decent swing at replacing it.
Unfortunately, the digits after the “3” are not there due to burn through. The circuit is for charging a 12V ratchet battery pack (3 - 3.7V lithium rechargeable batteries in series). This component is fried most likely from over voltage during charging (bad charging transformer - poorly regulated voltage) the component appears to be part of the charger regulation circuit that shuts down charger input once full charge is sensed. I’ll try to remove part as time permits and see if there is any marking on the back of it, but it appears burnt through in that spot by the 3…not sure any ohm readings would be helpful once removed due to the burn through…any other ideas? Thanks again…
