On Sun, 30 Jan 2011 07:21:36 -0800, William Sommerwerck wrote:

I'm posting this to see if anyone /knows/ the answer, or has a
reasonable suspicion. I do not want to initiate an interminable chain of
speculation.

I own a 36" flat-face 400-series Sony WEGA IDTV and, yes, I have the
service manual. The set has gotten heavy use over the past decade; I
often leave it on when I go to bed. It wasn't cheap, and I'd like to get
at least another five years out of it. For a non-HD CRT set, it has an
excellent picture, especially with RGB signals from a DVD player.

When the set's turned on, the HV is apparently shut off, so that the CRT
heater has time to come to full temperature, to avoid stripping the
cathode. (This is speculation.) Though sound comes on almost
immediately, it takes about 10 seconds for the raster to appear.

Recently I've noticed "something new". For about two seconds after the
raster comes on, the black level is too light. You can see the image
"darkening" as the black level drops to its "correct" point. This occurs
only when the set is "cold"; cycling the power doesn't cause this.

I'm hoping someone will say "I've seen this. It's the ___________."
Troubleshooting this set won't be easy (if only because it's close to
the wall on a near-immovable stand). I don't want to tear into it until
I'm reasonably certain I can fix it on the first try.

Thanks in advance.

Wait until it is a problem that doesn't go away after 2 seconds.



--
Live Fast, Die Young and Leave a Pretty Corpse