3 Sep
2005
3 Sep
'05
11:29 a.m.
9000 VAX wrote:
Hi, list,
My VT220 went crazy yestoday. When I was doing something else on my
PC, suddenly the VT220 monitor was blank (black) and the LEDs on the
monitor flashed. The frequency was about 4 or 5 times a second. The
keyboard LEDs (LK201) flashed the same speed as the monitor LED.
Taking off the keyboard and the RS232 port did not solve the problem.
Does anybody know what happened? Is there an easy way to fix the
problem? Thanks.
Most likely problem: your flyback shorted out.
DEC used lousy flyback transformers, and they were always my
biggest problem with all the VT terminals. They would short
out (cracking the ceramic shell and oozing black goo that would
then harden), and often taking out a driver transister too.
You can repair this problem with a new flyback (probably
going to be hard to find), and a new transister. Been there,
done that (many times), got the T-shirt.