As I understand it CED players read a frame count off the disc and will in the absence of it skip forward till they find signal with it.
My hunch is the portion of the circuit that decodes and interprets it past wherever it is split from the A/V signal have suffered some failure. (Maybe caps?)
A schematic would be necessary to do targeted troubleshooting.
I've never had this specific issue before so that's about as much insight as I can offer given the information here.
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