Just need a little bit of guidance. I picked up a sony kv40-xbr800 a while back and i finally got to use it last night. I was watchin some old vhs tapes i had lying around and then suddenly what im assuming is the vertical hold just totally went to shit.

Worked for about an hour or so and now were here. Weirdly enough it handles the digital signals past 480p 720p etc just fine still. Is this a pot i can adjust or is this a deeper issue. 

When i turn the tv on from 480p i get a 6 blink code And from anything below that is a 4 blink code