"William R. Walsh" m
wrote in message news:7pNCi.83815$Fc.55515@attbi_s21...
Hi!

Depending on how the CRT lost its vacuum, and if anything is shorting
or not inside the CRT, will determine if there will be an actual short
when putting the power on to the monitor.

That's good to know.

Buy your description, it sounds like the CRT was damaged, and air got
inside. In this case, your monitor is considered to be, "scrapped"!

Ah well. I didn't have much in it, that's for sure. It's actually a very
tiny display, used in applications like POS terminals or similar. To my
surprise it would sync perfectly at 800x600 without issue. It had a good
picture, but the screen burn was terrible. I could still read the log-in
screen text of whatever kind of a system it had been attached to.

At the time, I could have bought a whole trailer of them for pennies on
the dollar. I just didn't believe the guys selling them when they said the
monitors were color. Now I wish I had--these seem to be somewhat hard to
find. :-( Of course, none of them were pretty. All of them had screen burn
and most looked like they'd been used in a basketball game, including this
one. I guess it just finally had enough.

Curiously enough, the electronics all seem to be *fine*. I've got high
voltage, the CRT heater is running, the energy saver LED will come on
after the computer should turn off the screen, and all the controls
respond by turning on the LEDs in their buttons when pushed. Perhaps even
more curious--this monitor does not have OSD (it was made in 1995) but it
does have a dedicated board for the control pushbuttons that uses an 8051
microcontroller in a socket. That seems like a lot of "horsepower" for
such a simple task.

William

I have *never* seen a CRT that has lost its vacuum, continue to have a
visibly functional heater. As you surmise, it is normal for it to burn out
immediately. Likewise, it is common to see fireworks in the CRT neck,
particularly with small ones where the inter-electrode gaps are small.
Somewhere on the CRT neck, you might be able to see the gettering flash
deposit which, if the CRT has taken air, will be white rather than shiny
brown. However, sometimes, the getter element hangs down inside the bowl, so
you can't see the deposit. A few voltage checks at the A1, grid, focus anode
and cathode pins, should tell you the story of why there is no display

Arfa