How fix lines on CRT from signal lead ?

Wrong again, particularly when you deliberately restrain the cable and wiggle/flex the video card end.

That pulls the wire .. which pulls the other end connector ... which pulls the crt card .. which wiggles the crt .. which wiggles the main board ... you can't test that way. It will fool you a million times.

johns

johns wrote

No it doesnt if you restrain the cable.

No it doesnt if you restrain the cable.

No it doesnt if you restrain the cable.

No it doesnt if you restrain the cable.

No it doesnt if you restrain the cable.

Corse you can.

Only those that are very easily fooled and cant even manage to restrain the cable while flexing the video card end.

Agreed... Sounds like a bad VGA cable or possibly the connector on the video card. I don't even know why there is even any debate about this. Replace the VGA cable first. If the problem still exsists afterwards it is elsewhere. The guy talking about the flyback is just trying to be a troll and start a huge arguement over nothing.

The following extracted from:-

Attention-seeking trolls

This class of trolls seeks to incite as many responses as possible and to absorb a disproportionate share of the collective attention span.

• Messages containing a deliberate flaw or error: "I think 2001: A Space Odyssey is Roman Polanski's best film." Or "Federico Fellini is the Greatest Living American Director"

*Asking for help with an implausible task or problem: "How do I season my Crock Pot? I don't want everything I cook in it to taste the same."

*Intentionally posting an outrageous argument, deliberately constructed around a fundamental but obfuscated flaw or error. Often the poster will become defensive when the argument is refuted, and may continue the thread through the use of further flawed arguments; this is referred to as "feeding" the troll.

If you dont think wiggling a thick fat video cable can wiggle the plastic base that the main board sits on, and thus the main board, then either you havent repaired too many monitors, or youre a moron. Almost certainly both.

NT

snipped-for-privacy@care2.com wrote

Never ever could bullshit its way out of a wet paper bag.

Any 2 year old could leave that for dead.

Get one to help you before posting again, if anyone is actually stupid enough to let you anywhere near one.

snipped-for-privacy@gmail.com wrote

All completely irrelevant to whether what he was doing had anything what so ever to do with attention seeking.

He may well be just another rather irrational individual.

It depends entirely on how well that cable is fixed internally. Some certainly would but quite a few wouldn't. So yes it's possible but not necessary true.

Hi Jon

As electronic equipment gets older, the Electrolytics begin to fail, the ESR begins to rise. A failing Electrolytic would cause top fold over. If you look at a typical vertical drive circuit, Electrolytics near the circuit B+ to ground would cause top fold over, While Electrolytics near ground potential to ground would cause bottom linearity problems.

light-colored horizontal lines a couple of inches above the bottom of the screen usually just one or two of these the picture size too *sometimes* seems to get a tiny bit smaller when these lines are present.

I have tracked this down to the signal lead going from PC to monitor.

This d*mn lead seems quite sensitive because slight kinks and bends in the lead can create this effect. So can gently moving the plug as it goes into the video card. Why can't they design a better lead than this? It is already the most inflexible lead on my whole system!

MY QUESTION IS ... is this lead usually as sensitive as this or is it related to the design of my particular monitor and PC interface.

Can I do anything to improve the situation? I have lowered the screen refresh rate a bit but that doesn't seem to have help.

Is there a "magic bullet" like something to clip onto the leqad or some screening.

Changing the lead means some tricky messing around inside the monitor to terminate the leads it in the screened cage sitting on the cathode parts of the CRT itself.

Any ideas?

Jon

a novel explanation.

Lytics are always suspects, but I wouldnt give them too hard a time. All but one of the lytics on my 1930s radio are still fine.

NT

My bench service on home entertainment goods shows an awful lot of dried up lytics, and bad solder joints. With rohs, I suspect the latter will become even more problematic. regards, tom

I am the OP.

Guess you haven't read this thread earlier this year in sci.electronics.components

Many were skeptical like you. But the most convincing answers came from those who knew there was a value in doing this and I think they were the majority.

EXTRACTS ...

keeping components hotter than they would be if running in "free air" conditions.

Not only does it have the chance of getting onto circuitry, it also changes the capacitance of the tube wall, changing the circuit for the CRT drive elements as well.

The collection of dust, and much of that moistened at some point makes for a leaky anode supply and feed wire at the very least. That makes for poor or shifted focus settings, and other problems that less than your average video afficianado won't notice.

Most folks rarely notice their focus shifting as well. One has to be video oriented to notice such things.

Just to back the pro cleaning side, when I made my living from servicing monitors (and before that TVs) every once in a while I'd get one on the bench with the safety shutdown tripping because of a buildup of crap around the anode connector or other HV parts, but then I've also had nearly as many repairs in that people had damaged cleaning the inside when they didn't know what they were doing!

Nope, they did what most do, made random theories about what hypothetical advantage there might be, without any real evidence to support the theories. Let's suppose it did help a particular monitor, is that then evidence it is going to help most of them? No.

Further we'd first need to know how old the monitor is (is it even worthwhile), how much crud accumulation there was, and a measured deviation from appropriate operational values. Of course it's not good to let parts overheat, or conduct along unintended paths... but what remains is actually having that happen. A monitor so poorly designed that it can't stand a little bit of dust may not be worth the effort, and one buried in dust might only be a sign of the real problem- the room needs better air cleaning equipment, instead of individually cleaning out every part over and over again.

What good does it do to If you're obsessive-compulsive and have nothing better to do, by all means clean the insides of your CRT equipment. But it's probably more likely that something will get messed accidentally, than any significant improvement in either performance or life span.

The high voltage area of modern CRT equipment is generally enclosed and or sealed with HV grease or adhesive. It's not like old all-tube-type TVs where everything collected an inch of dust if you turned your back. :)

Yes, dust does collect. And yes in principle that may affect something eventually. But if there are no symptoms, leave it alone.

I did what that thread suggested and I got a pleasant surprise in the improved focus.

Maybe my monitor is s**te.

Maybe my room is s**te.

But that's my monitor and that's my room. And that what I have to deal with. A good de-dusting works nicely.

I am glad to see you went to the thread and look through it. Well done.

OTOH my extracts were for those folks who are sort of 50:50 undecided about checking that thread out. So I posted a random selection of extracts to show its relevance in the hope that the 50:50 readers would go and look.

Hey! I did write, "Many were skeptical".