Audio System X-Ion 280.2

mosfets all ok, transitors and diodes are all ok...i dont now anymore......
the mosfets for positive and for negativ become a signal, but only the lower half of the waveform is produced.
The input is allready the upper half noisy.


Back to the beginning. The input is allready noisy at the first cap at the rca jacket. If i use the other channel, its clean.
If i connect the load to the other channel, it has the same effect. Upper half missing, and allready at the cap from rca noisy input.
 
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If I open the preamp circuit, and inject the signal after that circuit, it has the same effect.
 

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Goodmorning everyone !! I am trying to repair an audio system x ion 280.2 amplifier! in theory the amplifier has no faults but the audio does not come out in speaker! The mosfets are all good but i have not bias voltage on the power mosfets.Can you give me some diagrams or some advice ?? thank you very much good job everyone