I have this TV, which only has OSD options for contrast, brightness etc, but doesn't feature any kind of service menu for geometry adjustments. When I got this set it had some noticeable rotation, which I managed to improve by turning the yoke collar a bit. This is how it looked after that:
https://i.imgur.com/yJ5N60H.jpg
There was still this severe issue in the top left corner for whatever reason, which I was able to somewhat fix by tacking on two sets of magnets, one at the left side to push the image down and one at the top center of the TV to correct the discoloration that the other magnet caused. I'd have prefered attaching them to the tube itself, but that didn't work out well enough in terms of correcting it just the right way. This is how it came out:
https://i.imgur.com/DXapbh3.jpg
https://i.imgur.com/iEI8aed.jpg
It's somewhat useable now in this state, but there are still issues left, like the h-shift (I already turned the pot for this all the way to the point where part of it actually broke off, possibly due to rust) and some distortion mainly on the left side of the screen, visible on the 240p suite main menu pic. Also this slight curling effect visible on the grid. Is a recap the next step in troubleshooting this TV, i.e. can it fix at least some of these issues? And if I do recap it, do I have to replace just all the electrolytics or do the HV mylar caps need replacement as well?
Sony KV-1400D magnet fix
-
buttersoft
- Posts: 377
- Joined: Sun Jul 24, 2016 7:49 am
Re: Sony KV-1400D magnet fix
My experience of recapping comes largely from a couple of arcade monitors, so I'm not sure it's totally applicable, and someone else might have a better understanding of this, but...
A recap may not do much for finer geometry. You should see a slight improvement to those pics you posted, but then again you might not. It almost certainly won't touch the issue you've corrected with magnets.
If you do go ahead, you want to do all the electrolytics and all the polymers. (Technically, if you'd worked out that only your vertical geometry was wrong, you could do that section alone. Most chassis are divided into sections with component numbers to match.) You're less likely to have direct problems with the polymers, but you'd want to do them at the same time, regardless of value or voltage. Make sure to use the same value caps, same type if at all possible, of at least the same voltage tolerance. And make sure the polarity is right for the electrolytics! Take photos or something before you start, as occasionally the schematics can be wrong. The ceramics you can probably leave alone because they last forever. Tantallums I must admit to knowing very little about.
A recap may not do much for finer geometry. You should see a slight improvement to those pics you posted, but then again you might not. It almost certainly won't touch the issue you've corrected with magnets.
If you do go ahead, you want to do all the electrolytics and all the polymers. (Technically, if you'd worked out that only your vertical geometry was wrong, you could do that section alone. Most chassis are divided into sections with component numbers to match.) You're less likely to have direct problems with the polymers, but you'd want to do them at the same time, regardless of value or voltage. Make sure to use the same value caps, same type if at all possible, of at least the same voltage tolerance. And make sure the polarity is right for the electrolytics! Take photos or something before you start, as occasionally the schematics can be wrong. The ceramics you can probably leave alone because they last forever. Tantallums I must admit to knowing very little about.