I received this woofer from a client who wanted it checked by a technician.
According to her the woofer no base but the rest is working well.
I did the test to confirm what she said and noted the woofer symptoms were different from what she gave. The actual symptom was low audio output.
I opened the woofer and this is what I saw.
Once opening the woofer and did some scanning, I noted an area with dark burnt marks, in electronics dark area on the board are signs of stress.
Turned the both the other side and noted a resistor has been fixed across the burn marks, this is a low value resistor and therefore was acting as a fuse.
Next I followed that line and lead me to the amplifier i.c. Tda7379.
I tested the voltage on one pin of this resistor and noted it was fluctuating, I removed one pin from the circuit and the voltage went up, this lead me to conclude that the amplifier ic has some internal injuries and needed replacement.
I went to town looking for this part and got the part effortlessly.
I replaced the i.c and after applying the power, I noted the machine was restored back to normal.
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