[TechAssist] Sony PTV KV61V90 Distorted tuner picture

Hey group,
I have another Sony and no service manual
I have distorted picture with tuner and composite (rca) input on main
picture
composite input for PIP is good
S-video input has good picture main and PIP
I suspect comb filter problem which is part of "A" board
What should I look for or can someone send scan or pdf of this area?
heating or cooling has no effect
tia

Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas,Tx

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