OSD shows before the picture fades in

[zeno]

My guess is..........
The set uses AKB or Auto Kine Bias. First used in RCA's IIRC.
The jungle IC has the circuit in it. It measures beam current
by firing each gun during blanking then adjusts the grey scale.
The OSD probably takes a different rout.
Some sets like Sony will not display a raster until its warmed
up & grey scale is good. Bad news is if the jug starts getting
weak the raster will blink on & off.

BTW if a set has AKB you can usually collapse the vert a little & see
3 color stripes at the top. Thats the guns getting fired.

73 Zeno
LFOD !