behringer x1622usb no audio...

LITEC syStems

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Jul 26, 2014
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Hi all,
Im bought an used 1622 mixer..
The problem.. It doesn't bring out audio...even the leds level meter are not responding to the playing audio... But the fx leds near the fx screen are do responding.....
Well,which parts im need to check? If I'll spray with contact spray, may that help?
And do u know how much power the psu need to bring out??
May reflow can help?probably It seems that something spill on the mb....
Any suggestions are great!