[TechAssist] older zenith SR 3273 DT dark pix

pix is dark. the signal on the cathodes looks clipped and  distorted. I have 
checked the outputs and video amp circuits. changed the  la7672 processor.any 
help would be appreciated.
thanks
Mike  W.
A.M. stereo & video 
Seattle WA.
206 364  5904


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