Hi
I am trying to fix this amp which uses a class D power IC (TDA8954TH) . The amp went dead and upon checking, I realised that the bridge rectifier and transistor Q7 (TIP102) has shorted. I replaced them and upon powering up the transistor blew again. This time I realised that resistor R53 (10 ohms) has also blown. I remove the TDA8954 and upon checking, I realised that there is continuity between pin 24 of the IC and the metal tab of the IC. It shows 0 ohms. Also there was no Mica insulator between the IC metal tab the metal chasis. Does this indicate that the IC has shorted. I have a TDA8950th at hand. Can this IC be used as a replacement. Please assist. Refer to attachment.
Thanks
Carlos
I am trying to fix this amp which uses a class D power IC (TDA8954TH) . The amp went dead and upon checking, I realised that the bridge rectifier and transistor Q7 (TIP102) has shorted. I replaced them and upon powering up the transistor blew again. This time I realised that resistor R53 (10 ohms) has also blown. I remove the TDA8954 and upon checking, I realised that there is continuity between pin 24 of the IC and the metal tab of the IC. It shows 0 ohms. Also there was no Mica insulator between the IC metal tab the metal chasis. Does this indicate that the IC has shorted. I have a TDA8950th at hand. Can this IC be used as a replacement. Please assist. Refer to attachment.
Thanks
Carlos