"Wiebe Cazemier" wrote in message
.home.nl...
On Friday 25 April 2008 18:38, James Sweet wrote:

I would suspect bad solder joints in the area where you can induce the
fault
by tapping. It *may* be a short inside the CRT, but don't condemn that
yet.
Don't worry about discharging the capacitors, just unplug it for 10
minutes
or so and it should be safe. Even when you're sure everything is dead,
treat
it as live just in case.

And what about the CRT? Is discharging as I described safe?

When the fault is in the CRT, I assume nothing can be done? Well, let's
just
hope it's not that; those Sony Trinitron tubes are pretty good, so I guess
the
chance is small. But on the other hand, because after a fault, the screen
is
greenish, which turns OK over the course of about 30-60 minutes, heating
cathodes may very well be it. The cathode assembly itself doesn't heat up
that
fast.



You shouldn't have to discharge the CRT, that's only necessary if you have
to remove the anode lead, even then it usually discharges itself through the
focus divider on color monitors.

The 22" flat trinitron tubes commonly have intermittant focus issues, mine
acts up occasionally but has behaved pretty well lately. Haven't run into
that with the 19" tubes.