First post the model number & a good pix of the
chassis. This will give us much more to go on.
If the set runs normal for a while this does point to a
HV shut down (HVSD) problem often. Cold solder joints or a
bad electrolytic cap are most likely. You can usually
give the set a good slap while running normal & if
it goes dead its a cold PC con........
Not to worry about the HV. Most sets after the mid 70's
will bleed off in seconds. Even if it gets you its no big deal.
Used to be a weekly event in the olden days. The only
bad place is the AC where the cord comes in. So unplug !!!
73 Zeno
LFOD !