Working on RCA RNSMU4336, SN A1901272410000314, with
screen rendition issues, for any/no input.

Display stretched, gradually moving off-screen towards the left,
eventually (~minutes) displaying black screen (all lamps functioning).
All power circuits functioning, until VDGAWR1 shuts off (black).


Haven't had much luck getting response from regular service
channels in Canada and web search hasn't produced much info.

Any hints?

RL