How to deal with the problems of IC burning up?

[Bolling]

I looked at a friend's guitar amplifier which wasn't working, the problem was clearly (because it fell off) a broken IC (TDA2030AC).

After replacing it, the amplifier started working again but when I was taking some measurements I made a short-circuit and burned it.

When I replaced the TDA2030AC again, the sound was very soft and distorted. I checked the datasheet and the circuit is a bit different than the recommended implementation. Some resistor and capacitor values are different, but it's a dual-supply non-inverting configuration.

The strange thing is that while making contact between pins 2 and 3 with my fingers it sounds fine. And the same occurs with a resistor between about 100 to 500 kohms (see red line in my diagram). Even if that solution works, I would like to understand what's going on and if there is likely another part of the circuit damaged.

I've post the circuit (excluding the rectifier and pre-amplifier) in the attachment.

And this is the reference circuit in TDA2030's datasheet: http://www.kynix.com/uploadfiles/pdf9675/TDA2030AH.pdf (Figure 13: typical amplifier with split power supply)

I would appreciate any clarifications, thanks.

[The Robman]

You got your answer for this over a year ago:
https://electronics.stackexchange.com/q ... 30-circuit

Then you got more answers here:
https://www.questarter.com/q/distortion ... 28943.html

And even more here:
https://forum.guitar.com/amplifiers-23/ ... -ic-226880

So, what else do you need to know?