13 Dec
2003
13 Dec
'03
8:50 a.m.
I've got three N4005 21" color monitors, three (now) good and bright
N4000A monitors. I just lost a 17" N4006 Trinitron. After a lot of
years, it finally got so dim it was totally unuseable. I wonder if it
would be possible to replace the tube in the Sony monitor?
It's _possible_ (it must be, the CRT was origianlly a separate part), but
it might be a lot of work. You'd probably need to use the yoke from the
NeXT monitor (unless you were taking a CRT from the same model of
monitor), and thus you'd have to do all the convergence adjustments, etc.
However, it might not be the CRT. All sorts of things can cause a dim
picture. It's too late now, but when I get a working monitor, I record
the CRT electrode voltages (including the EHT on the final anode). If it
then goes dim, or out-of-focus, or... I can then re-measure all the
voltages to see if any of them are way off. If they're all 'right', then
it probabyl is the CRT, but if, say, the first anode (you'd call it g2)
voltage is way down, I know where to start investigating.
-tony