I'm trying to repair the circuit of an amplifier that has a blown transistor. I've already identified it by the out-of-circuit test. But, it is only to change this transistor that it returns to overheat and burns in a few minutes.
If the transistor re-burns is because the overload or cause of its burning in the circuit still continues, ie there must be another component in the circuit with problems. It can be a shorted diode or an electrolytic capacitor in short or still a board problem (short tracks) and up to another transistor in the same circuit. So, before replacing the transistor, check the nearby components. Whenever you perform a repair job, even if you locate the faulty component, you need to verify that your burn was not caused by another component that has shorted or changed.
