Repair or adjustment of a Philips Brilliance 17A

This may be a bad video cable. It could be reflections on the cable bouncing back and creating the ghost. It could also be a failed termination resistor in the monitor, or a bad contact or broken solder joint at the video connector.

Jon

Thanks Jon, after Xmas I'll swap the video cable for one from a working system and report, ... Peter E.

Yes it could be the cable, but I think it would be a pretty rare failure mode, maybe even a freak. I looked twice to make sure - this IS a CRT monitor. In that case if the chassis has a floating filament supply this could be an HK short in the green gun.

The trailing positive that makes the white after black green also makes the black after white on some of the text magenta, which is minus green. The frequency response of the green is limited, too much capacitance. A standing wave anywhere in the green path could also be at fault as someone already pointed out, but lots of CRTs short out this way.

If so, if I have a print of the vid finals, the CRT soicket board, I can maybe figure out how to EQ the vid output. I have done this more that once. However I did that on NTSC units and I didn't worry about FCC part 15 or anything. Those things only have about five Mhz video bandwidth, this might be different.

There is a way to do this on almost any CRT based monitor, but the question is whether it is worth it or not. The focus isn't really all that bad but it ain't that good either. You have to differentiate that from the smear in the green though, if the green was sharper it would look sharper overall.

Without the print of the CRT socket board, ar at least a sheet on the IC(s) on it, it's about impossible to do anything. In fact that's true even if it's not an HK short.

Thanks for the replies. Again a fresh thread because the original is closed to further reply.

From: Jon Elson Date: Mon, 19 Dec 2011 14:37:22 -0600

To test, I replaced the beige colored cable about 1.5 m long and apparently original, with a black colored cable about 2 m long and skinnier. No significant difference in the display. For sake of interest, the black cable was still folded and fastened with a twist tie and inside the thin polyethylene sleeve from shipping. In hindsight, not an arrangement to ignore. After a couple of hours this way, the cable was quite warm to the touch. Luckily I was paying attention and changed back to the heavy beige cable. I wouldn't have expected a video cable to generate that much heat. The current is too large or the black cable has wire cross-sections pared a minimum, or both.

From: Jeff Urban Date: Wed, 21 Dec 2011 18:54:37 -0800 (PST)

So the practical conclusion is to replace this old monitor with a flat screen purchased for less than $100 from a local broker.

Thanks, ... Peter E.