These types of failures are the kinds of problems that TV techs have seen
regularly for a lot of years.. a relatively simple fault is capable of
causing the "smart chassis" type designs to be completely dead, in many
cases.

In sets that develop a fault, and also have some other components that have
changed values due to age, the chassis essentially has compound faults,
which were commonly referred to as Tough Dogs, among other names.
Shut-down circuits have been implemented for many years, to prevent the TV
from operating at all, if the CRT's HV potential exceeded a limit, as a
safety shutdown.

Some minor faults are often complicated by poor soldering during the circuit
board manufacturing process/build, which creates new faults as the boards
age and go thru many thermal cycles.

Many of the electronic equipment designs presently manufactured are similar
designs of smart chassis design, in that one fault will disable every
function.. maybe with the exception of a blinking LED.
In many of these designs, either everything operates within normal limits,
or the units just shut down and won't restart without experienced technical
intervention.

--
Cheers,
WB
..............


"Sylvia Else" wrote in message
...

I suppose it's conceivable that since it failed in operation, it always
tries to power up in that mode, and that the processor won't allow entry
to standby mode unless everything's working. That would seem a bit
perverse, but who knows?

Sylvia.