On Thursday, 15 August 2019 13:13:06 UTC+1, wrote:
This is an old-style CRT monitor from very roughly the mid-1980s. I would start with the electrolytic caps first. Mind all safety processes prior to working on it. While you are 'in there', clean everything and look for any corroded or loose connections, as the symptoms you describe could also be heat-related.

Best of luck!

Peter Wieck
Melrose Park, PA

Hi Peter and everybody,

UPDATE:

The problem turned out to be a series of MISLEADING COINCIDANCES. The
monitor does NOT have a problem. The problem turned out to be a faulty video
source, (intermittent poor grounding/shielding).

When it first started, it was intermittent. Since I have another 1702
monitor, I replaced this one with my "backup". No more problem.
I was convinced the first 1702 has an issue.

With the back off, it finally happened and I was able to "scope"
the video signal (distorted) right to the video input. The problem
was NOT the monitor.

I then used a DVD player as a signal source and by golly,
NO PROBLEM.

John

that was easy


NT