A burnt transistor may confuse a technician especially if It has cracked and the numbers are no longer visible. this, however, should not worry you if you have the right information. for burnt transistors/ICs that have no clear markings consult a specialist, his article can help you identify If you read It to the very end.
A transistor like CD 7266 used in small amplifiers is the same as TDA 7266SAwhich is the readily available spare.regulators can come in bearing LM 7805 but the spare is L7805 a very common 5V regulator. also, KIA 730 found in inverters is the same as IRF 730.so what should you look out for when searching for an ideal replacement for a transistor or ic.
- Physical appearance-if they look the same and have the same pin configuration they probably are the same.
- No after the letter markings –D 2030 is The same as Tda 2030 D2822 IC is The same as TDA 2822.
- Where is it used-if he replacement IC/transistor is used in the same place and no 1 & 2 checks out then you have the correct spare?