On 21 Set, 09:07, Wicaksono wrote:
Maybe that is a MJE13003, a common BJT used in CFL.
Usually there is a smaller electrolytic capacitor that went dry,
this makes switching transistors overheat & short circuit.


Yes, it's definitely an MJE13003 clone, unfortunately it's not easy to
find
a TO-126 equivalent here. Ordering online woult cost way more than the
ballast is worth.
Thanks anyway, learning is always good.

Best regards
Francesco