What to do if the amplifier in the trust audio system is phoning?

Question

Electronics

One tda2030a burned out, there are two of them, and one microcircuit is responsible for low frequencies. I soldered it, turned it on, but a wild background appeared and only a melody plays, the voice is not audible, the volume is adjusted only by the bass, it does not respond to the volume knob. Where to climb? What and how to check?

Answer 1

Loss of voice in the presence of a melody may be a sign of a break in the common wire of the plug, through which the input signal from the computer comes. Well, I won’t be surprised if, in the process of soldering, the solder was hung up somewhere, so visually check if you made extra contacts on the circuit. At the same time, check the quality of the soldering of the volume controls on the board, there may be microcracks.