If the cap and missing resistor are in series and one end of the pair connects to the negative speaker terminal and the other end of the pair connects to the positive speaker terminal, it's a zobel network. The amp will work without it. There should be one for each channel.
If you can't find the fault, post the voltages on the TL494 (or whatever they're using).
IC#
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16: