Hi, MZ,
Is this a Philips clone, where receiver senses display isn't Philips, and cuts to S/by.
PS - Have hated Philips since, well, old drive cords, Mullard projection EY51's, Visionhire, with the crap they couldn't otherwise shift, and, well, mostly everything else they developed, 'till those Chinese moved in with workable stuff, but no shematics.
Just a thought - Chris.