4 Ch Audioline Amp. Power but no sound.

[aiKz]

Hi, i just bought an amp for AUS$20 off a mate because he couldnt get it working and i thought i could. i opened it up and had a look at the internals, but i have no idea whats wrong. everything seems to be soldered properly, and i have cleaned the terminals of any loose wire threads but nothing is working. i actually get power (green LED), but no sound comes out, no matter what i do. any suggestions?

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