Achei que o amplificador estava queimado… mas o defeito estava em outro lugar

In this video, I show the complete diagnosis and repair of an LL PWM1600 amplifier that arrived at the workbench with no audio in either channel. Initially, everything pointed to a fault in the power amplifier, but analysis revealed that the problem was in the preamplifier. During the repair process, I explain how to identify the source of the fault, perform tests, and find the component responsible for the lack of sound. If you work with electronics or are learning amplifier repair, this practical case can help you avoid incorrect diagnoses and unnecessary parts replacements. If you searched for LL PWM1600 with no audio, LL PWM1600 not working, amplifier with no sound, amplifier with no audio in either channel, preamplifier fault, power amplifier repair, how to repair an audio amplifier, electronic diagnosis, or amplifier maintenance, this video is for you. Keywords: LL PWM1600, PWM1600, LL amplifier, amplifier with no audio, amplifier without sound, amplifier repair, amplifier maintenance, electronic maintenance, preamplifier defect, faulty preamplifier, electronic circuit analysis, electronic diagnostics, electronics workbench, technical assistance, practical electronics, power amplifier, professional amplifier, professional audio, electronic repair, electronics for beginners.