3 May
2005
3 May
'05
3:41 p.m.
Actually the most common thing I've seen short of
a complete horizonal
output failure is the CRT focus pot and associated resistor string fails.
Out of focus and ;'smeared' look totally different, though. But then
again the general public never were much good at describing faults :-)
It's a gradual failure and for most color monitors
that's part of the
HV transformer assembly. A few I'e stretched the life by adjusting
the focus but sooner or later it fails and the images are just plain
fuzzy.
It happeend to me in an Amstrad VGA monitor. I managed to get the flyback
transformer, fitting it completely cured the problem (of course).
Fortuantely I had the sense to do a continuity check on the flyback pins
-- the first one I was supplied with was totally incorrect and would have
connected the CRT heater to the 95V line.....
I heard of somebody taking a hacksaw to a flyback to cut away the
connections ot the focus network, sealing the cut ends with epoxy or
corona dope, and hanging an external voltage divder off the 25kV anode
output. I've not been that desparate -- yet!
-tony