Why after serving well for years, a smps controller ic fails without apparent reason?
My Sharp TV (LC46LE835X) worked well for 37 months but suddenly while being watched in the middle of calm night, it blacked out with small explosion.
I managed to repair it after changed a 7-pin dip ic and a 2.2ohm fusible resistor. No other components (SMTs) appear abnormal. TV works well now.
So I'm really wondering what could have caused this ic to fail. If it had manufacturing defect why it worked well for 37 months?