Thought to post up a repair I recently did on two of these chargers.
After replacing U1, TOP256EN, which seems to be a common failure and one I've done multiple times, these two ICs blew again, not instantly, but upon removing and reinserting the battery.
What I found was the snubber circuit had failed.
So after replacing U1 again, along with a resistor, polyester cap and a diode, all was well.
The parts and locations:
Replaced U1 - TOP256EN
Replaced D2 - 600V 1A Diode
Replaced C5 - 630V 4.7nF Polyester Cap
Replaced R12 - 68khm 2W resistor
Hopefully someone finds this info useful.
After replacing U1, TOP256EN, which seems to be a common failure and one I've done multiple times, these two ICs blew again, not instantly, but upon removing and reinserting the battery.
What I found was the snubber circuit had failed.
So after replacing U1 again, along with a resistor, polyester cap and a diode, all was well.
The parts and locations:
Replaced U1 - TOP256EN
Replaced D2 - 600V 1A Diode
Replaced C5 - 630V 4.7nF Polyester Cap
Replaced R12 - 68khm 2W resistor
Hopefully someone finds this info useful.
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