IIRC there is a control marked BL at the front panel. Its a
hole for screwdriver give it a tweek. The control panels did
also get intermitants sometimes. Set looks best with auto
color switch OFF ( color sentry ?). Pix looks like CRT is
quite good, if focus is real good CRT usually good.
I see no bleeding.
Zenith made some better sets before this but it is a solid set.
We were still junking them that worked perfect up til a few yrs ago.
73 Zeno