I'm looking to fix a computer monitor with VERY poor convergence.

[zeno]

The rings are only for center convergence & purity.
To adjust sides the yoke must be wedged. Usually
there are 3 rubber wedges between the yoke & CRT
to bend it. Often they fall out over the years.
Start there....

73 Zeno

[jmetal88]

Originally Posted by zeno

The rings are only for center convergence & purity.
To adjust sides the yoke must be wedged. Usually
there are 3 rubber wedges between the yoke & CRT
to bend it. Often they fall out over the years.
Start there....

73 Zeno

All 3 wedges look like they are in place... Any tips for the manner in which they should be adjusted, or will I just have to try messing with it and see what happens?

[Chip Chester]

You may have addressed this already, but has it been degaussed? If automatic, can you determine if it's actually working?

Along those lines, what it its magnetic environment where it's sitting? Non-shielded speakers nearby, or other significant magnetic toys?

Chip

[zeno]

try bending the yoke edges out & watch the effect. If they need to bend in
the yoke has to be pushed forward a little then the edges bent out, then
wedged. If you do loosen the yoke mark it so you can go back.
If its magnetized it will usually throw off the purity only unless
its real bad. Use an all red, blue or green raster to check purity.
The degausser will make a hum for a second with a COLD start.
A few will do it at turn off but thats rare.

73 Zeno

[jmetal88]

Opened it back up tonight. The yoke and the wedges are all epoxied in place, so I don't think I can move them if that turns out to be the issue. I can't bend the yoke enough to have any kind of effect on the picture because it's on a stiff plastic frame that has very little give to it.

Now that you mention it, though, I'm not sure the degaussing coil is doing anything (if it's made the 'hum', I sure haven't noticed it), so that may be part of the issue. I have a handheld TV degaussing coil I could try on it.