remove output (the big ones) check dc offset sa speaker terminal.
replace main filter ecap of higher capacitance value and voltage rating.
sis paturo pano mag test nang dc offset ilang volt ba dapat lalabas sa speaker terminal tnx...
^advice ko lang yun at para iwas din backjob. yan ang ginagawa ko sa mga china speaker amp na dumadating sa akin. kasi based on my experienced palaging bloated dahil underrated siya. then maliit din capacitance value.
i use not lower than 4,700uf/ 63 volts