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Most power inverters supply a modified sine wave output. This is different from the true sine wave you get at home. It's close enough for many applications, but not close enough for many transformers, which is what your laptop power supply is. So the problem is that your laptop's power supply does not work with a modified sine wave input. Some will, some won't. Very common problem.
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The truth is told by injecting a 1KHz sine wave and tracing it through the preamp and driver circuits. There is a very good chance that one of the electrolytic capacitors has drastically changed value offering more resistance on it's way to failure than the other channel. Chasing the sine wave from input to amp stage will allow you to find the difference and locate the likely point that needs attention.
I have worked on amps like these now and then as Chief Engineer in Radio stations. You will need a sine wave oscillator and a Oscilloscope to do this work.
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