#Monitor Woes
7 messages in this thread
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I have a 1084 monitor which has started acting up. Randomly it will bla
for varying lengths of time and then recover. I have tried to get it fixed
twice with out success as it works fine at the shop. The problem is that the
problem is random, may not occurs for hours on end, and no one wants to wait on
it. Has anyone else had this problem? (Sorry for the formatting 1st time to
try)
Frank,
Your message was a bit garbled…but I think you were saying that your
monitor blanks every now and then and after a while it then recovers.
With an intermittent like that…it's hard to diagnose here, but
presuming the power light stays on…you could have a problem with your Amiga
or your monitor. The best way to find out which is to swap the monitor with
another one and see if the problem continues. I realize that swapping monitors
isn't the easiest task in the world…especially finding someone to swap with,
but that's the only way you'll find out exactly what's going one.
Don
Don and Frank,
My 1084 and a friend's 1084 both have a different problem in which the monitor
cracks and the picture jumps (Like changing the channel on a TV).
The local tech says that Commodore (Canada at least) acknowledged the problem
and the problem is that static electricty gets stored in the tube, and then it
ZAPS! as it dischanrged. I think the fix is a capacitor from somewhere on the
tube to the ground (Don't do this without checking out what I am saying with a
qualified tech – This is from a distant memory).
BTW – My monitor has run for about 1 1/2 years like this with no visible
damage, and a "ZAP" every 5-10 minutes.
Sincerely,
Brian R. Niessen
Frank, if the high-pitched "squeal" from the monitor also stops when it blanks
out, and/or the power light goes out, then you are losing the high voltage. I
had this problem on my 1080, and I have fixed it by adjusting the OVP
(overvoltage protection) potentiometer. Remember, you shouldn't try this
yourself unless you are very confident about your ability to safely tinker with
the monitor – you are playing with a 20,000 volt circuit. Good luck in fixing
your problem.
One other thought – forgive me if this is too silly, but are you quite sure
that you aren't simply seeing the effect of a screen-saver program? These
programs run in the background, and are designed to blank the screen after 5
minutes or so of inactivity by the user. The picture would come back when you
move the mouse or type on the keyboard. Well, I didn't think that was it –
just checking to be sure!
Joel
Joel, thanks for your reply. I do lose the high pitched squeal, often with an
accompanying pop not unlike a static discharge. Although I do use a screen
saver program (Qmouse), I am certain that is not the problem. My repairman
(giving the benefit of the doubt) is trying desperately to blame it on my
computer, but I don't believe there is any signal the amiga could send to the
monitor to produce the pop and disappearance of the screen. Ideally I would
have another monitor immediately at hand so that when one blinks out, I could
switch back and forth and demonstrate a monitor problem. Of course, Ideally the
monitor would not have the problem to begin with! Thanks for your suggestions.
Frank Young
Frank,
It's the monitor, have him go over the high-voltage circuit including
the over-voltage protection circuit. Also, have him put corona dope on the HV
oscillator.
Don