Adjusting convergence

[Electronic M]

If you have an old tape head demagnetizer or a bulk tape eraser that could work.......Connecting a scrap yoke to a variac could also potentially work.

It can be a tad tricky to make it work with out a proper TV degaussing coil though.

[Eric H]

If your set has a built in Degausser then leaving it off for a while and turning it back on should clear up any minor magnetism.

If it's more serious then you will need a coil, sometimes and Old Weller Soldering Gun will work, hold it near the screen, turn it on and move it in a circular motion while moving away from the screen, release the trigger when it's no longer having any effect.

[zenith2134]

get a larger crt set and put the two screens face to face. Power up the larger one then power it off. I've used this method with my 35" trinitron and smaller magnetized tv's and it works a charm.

[lnx64]

My friend came over with his degaussing coil. He fixed it for me, but this bigger TV method I will try in the future.

[ChrisW6ATV]

Originally Posted by zenith2134

get a larger crt set and put the two screens face to face. Power up the larger one then power it off. I've used this method with my 35" trinitron and smaller magnetized tv's and it works a charm.

This sounds great. "Jump-starting" a magnetized CRT!

I imagine it must work pretty well.

[6GH8cowboy]

Collect 2 or 3 degausing coils from old CRT computer monitors. Wire them in series, keeping the direction of the wind the same, add a momentary switch handy and close to the coil then tape it up. You now have a free degausing coil for strong, on demand demagnetising of color CRT's. It will warm up but you only have it on for less than 15 seconds anyway. When I was in the biz we had a mirrored wall it helped to see the whole screen, no charge for that added tidbit. :-)

[6GH8cowboy]

When manualy degausing a trinitron type CRT dont get too close. The field can get so strong it will distort the shadow mask and result in purity problems that can't be resolved. Good practice with any color CRT, if you start hearing a constant hum from the CRT you'r too close and at risk.

[miniman82]

Trini's don't have a shadow mask...

I don't think this particular set has that kind of CRT, so it probably does have a mask. Even so, you have to try pretty hard to bend a shadow mask. A degaussing won't do it by itself, you need a strong magnet.

[6GH8cowboy]

We all know what I mean. Aperture grill, shadow mask same function, still ferrous, Trinitrons VERY fragile and unstable, be careful!

I smelled a hot sencore degaus coil that was left on near a 19" color set that was rolled next to it on a cart. Never could get the lower left corner right purity wise. Had to replace the CRT. Tech school .

[miniman82]

There was a Panasonic set at work in my division officer's work space last year, and he complained to me that it had a snowy and impure picture. Guess he knew I wouldn't turn down the chance to troubleshoot a set on company time. lol

Took the back off, and what do I find? The degaussing circuit had been stuck on because of a bad relay for who knows how long, but it was long enough to turn the PCB and all the components completely black. I removed the components in the degaussing circuit, unplugged the coil, then did a manual degaussing with my home made one. Set then made a pretty decent picture, and it's still there working to this day. Too bad purity will be shot to hell if they ever move it.

[Ed in Tx]

Originally Posted by 6GH8cowboy

... Good practice with any color CRT, if you start hearing a constant hum from the CRT you'r too close and at risk.

My Sony KV-27V10 has a LOUD degausing noise when it powers on. Loud hum from the aperture grill, fades away in a second. Been that way since 1995. Friends who bought similar sets asked about the loud noise. Normal.

I've used convergence permalloy strips many times to get a corner or side area to converge when everything else was good.

[dieseljeep]

The super el-cheapo RCA CTC-51K portable, never was equipped with an internal deguassing coil. That set has only a slightly better picture picture than a GE Portacolor, which isn't saying much. Any other VKer's have experience with this model?

[old_coot88]

Originally Posted by Eric H

...If it's more serious then you will need a coil, sometimes and Old Weller Soldering Gun will work, hold it near the screen, turn it on and move it in a circular motion while moving away from the screen, release the trigger when it's no longer having any effect.

Um.. not to be a fuddyduddy but the preferred method is to turn it on at least 6' away from the set and move it in slowly, then do the rest as you say. Avoids the sudden jolt of switch-on that way.

[lnx64]

How strong of a magnet would it need to be to permanently damage a shadow mask?

I have one of those magnets that clip onto a fridge that can hold screws and tools.. A long time ago when I had a party, it was placed in front of this TV to the point of touching the glass.. Drunks thought it was cool. I nearly crapped a brick..

This has caused a slight "bluish" center on white screens.. Not seen easily, but on an all white screen, you can slightly see it..

[lnx64]

Here's a picture of the mentioned spot.

http://img.photobucket.com/albums/v3...gon/purity.jpg

Notice how the center is slightly discolored. No matter how many times I use a degaussing coil it will not go away.