Most Sonys used AKB = Auto Kine Bias. Sony throws in a curve
ball. If any guns are weak the video shuts down. There is no known
way around it. Turning up G-2 will give a raster with retrace but
no video. There is a trick to prove what gun(s) is causing it &
prove its that & not the IC etc but I never had one that wasnt
the CRT. Rejuvination is a waste of time. Sony color tubes
will look better for a day at best.
73 Zeno
LFOD !