Weird problem with Sony KV-20FV12

[zeno]

Sony AKB circuits will mute the pix if a bad CRT but
I will assume yours is OK. Usually the pix blinks
when cold & does it less with warm up.
It is also sensitive to the G-2 setting so turn it up a tad
& see what happens. Basicly if any gun cant draw enuf
current the jungle IC shuts off all Y & C. During blanking
each gun is fired & current measured. You can usually see
three color lines at the top if you shrink the vert a little.

The CRT should have about 125V on the cathodes with
normal pix & 200V no pix ( zero beam ), G-2 abt 500V any pix.
Dont remember what the G-1 did in these.

73 Zeno