TS.unplug all inputs first, kapag nawala ugong RCA plug sira or grounding probhlem lang.kung meron parin humming pero me audio at the same time malamang sira ung Electrolytic cap na malaki ussually 10,000uf value nun.kung meron ugong at walang audio ksabay ugong lng talaga naririnig sa speaker sigurado me shorted na transistor na yan, itrouble shoot mo na.
panu po ayusin kapag may ugong na naririnig??
heehehehe