Every AKB problem I have seen ( many) was a weak CRT. On
older sets this caused blinking that slows with warm up. When it
does its obvious the CRT is weak. It did not cause shutdown.
One thing may be a H-K short. If it runs a while try lightly tapping the
CRT neck & see if it craps out. This was on older sets.
The other thing is the power supply. Not sure what yours has but the
wide screen ( 30" & 34" ) sets had 2 IC's that constantly go. They caused
all kinds of problems related to dead set, int start, shut down, hard start.
More on that if needed. I had one & got sick of changing them
every year. Other than that they were probably the BEST CRT TV ever
made.
73 Zeno
LFOD !