Josh128 wrote:
Whats happening in this pic is that your horizontal convergence is "keystoning" from the bottom of the screen to the top, also called C-cross if it only occurs at the sides or Y-cross if it happens in the center. If you look close you will notice that the blue is misconverged to the right side of the white at the bottom, where at the top you can see it is misconverged to the left of the white (while the red does the exact opposite). Very easy to see whats happening if you look at the first white vertical line just to the right of the red/white joined line. I have some similar issues on my 36" with what is called X-cross, or vertical convergence keystoning from side to side. I was able to get it a bit better by adjusting the XCV reactor on my set.
Adjustments for this are as follows:
1.) Use the YBWU and YBWL bus service mode registers on units that have these registers. Many units do not have these registers.
2.)Tilt the deflection yoke up and down
3.)Adjust the YCH Reactor (should be one of the inductive reactors on either the yoke or neckboard.
4.) You can also try to barely move the H-stat adjustment. You might be able to get the top and bottom looking better, but it will also affect the center so you need to find the best balance.
**Edit It also looks like you have some vertical misconvergence at the top left as well -I can see the blue on top of the horizontal white line and red on the bottom of that line. Does it cross to the opposite way at the other side of the screen? If so, you also have some X-cross, just as I did. Be warned that trying to get the "perfect" convergence can be a VERY time consuming and painstaking process. Adjusting pots and reactors is easy enough, just make sure to count the turns and directions of the adjustments you make. Its very easy to fix a problem on one part of the screen only to later realize your adjustment caused a new problem on another part of the screen. You likely may be able to improve what you have, but at some point you may have to call it "good enough".
I would start with a very fine tweak of the H-STAT pot and be sure to scan all areas of the screen after each adjustment. Once you start moving that fucking deflection yoke shit gets real. Thats usually my last resort and I almost always avoid it if possible, as its rare for it to move from the factory adjustment, which is usually close to as good as it gets....usually.
Thanks a lot for your explanation Josh. That was very helpful.
Adjusting the static convergence (H-STAT or V-STAT) will not do anything major at the borders without screwing the center (since the static convergence targets explicitly the center of the screen). For border convergence there is only some slight yoke tilt + magnets (external or strips). But I'm not worried a lot about borders convergence. What I'm really trying to solve is the C/Y-cross problem you mentioned.
I'll check if the PVM2042QM has the reactors of the registers you suggested, cause I'm also trying to keep the yoke as a last resort.
Thanks.