Next up on the operating table, my PVM. it has some geometry issues but I'm NOT going to muck with the yoke on this one. Never again...
Spoiler
Never did fix that vertical linearity issue on the left. I guess I'll just have to live with it.
Good to know. I guess I'll do some testing and see if it shows up too badly in games then.yoZe wrote:From my experience (and believe me I have reworked the image on a lot of crt's), from your pictures, readjusting the yoke will not improve the convergence. I think you already have a very good convergence.
You can at the limit bring a little better with strips in the corners but even with strips I am not convinced that we can obtain better than what you already have.
I guess I have it focused pretty well then. I just eyeballed it until the corners weren't blurry and the center area looked crisp. I'll take one last look before closing it up though.Josh128 wrote:Focus must be balanced from center to the top and bottoms. Best focus in center will leave you with blurry tops/bottoms/corners and vice versa. My Hitachi 27MMV20B manual says to put up a crosshatch and adjust focus for the 6th horizontal line from the top, as this should be the best balance. In the 240p suite grid with red outlines, that would be the 4th or 5th horizontal white line from the top.
It's either bad polymer/ceramic capacitors that are responsible for the "S-Shaping" wavelength, and sometimes a bad coil, or just a flat tube being flat.yoZe wrote:A lot of crt tv have horizontal linearity problems and I never found anything, either on the chassis or in the service menu to correct this defect.
I regularly search for a solution to this problem but I still haven't found anything until now.
It means that some capacitors have lost their capacity or it's a chassis design problem with capacitors not having the right value from the beginning?tongshadow wrote:It's either bad polymer/ceramic capacitors that are responsible for the "S-Shaping" wavelength, and sometimes a bad coil, or just a flat tube being flat.
A little bit of both, it's hard to tell unless you have bought the display brand new. Here's a interesting document about H-Linearity.yoZe wrote:It means that some capacitors have lost their capacity or it's a chassis design problem with capacitors not having the right value from the beginning?tongshadow wrote:It's either bad polymer/ceramic capacitors that are responsible for the "S-Shaping" wavelength, and sometimes a bad coil, or just a flat tube being flat.
Otherwise, the problem is the same on flat or curved tubes.
I have for example 4 flat trinitrons with a FE-2 chassis which have no linearity problem.
Yeah, something like that seems to be the textbook procedure. I honestly find it easy to adjust, just wiggle it back and forth a bit until it looks good.Josh128 wrote:Focus must be balanced from center to the top and bottoms. Best focus in center will leave you with blurry tops/bottoms/corners and vice versa. My Hitachi 27MMV20B manual says to put up a crosshatch and adjust focus for the 6th horizontal line from the top, as this should be the best balance. In the 240p suite grid with red outlines, that would be the 4th or 5th horizontal white line from the top.
Uh, this looks quite wonky indeed. Give the age of the CRT, might be time for a recap?Tempest_2084 wrote:Last but not least here is my PVM 1943MD. This is the one I'd really like to get working to be my backup, but as you can see it has some geometry issues (no convergence issues thankfully). Any suggestions on how to fix the wonky geometry here?
I wish I could find someone who could do that for me. That's beyond my abilities.ASDR wrote:Uh, this looks quite wonky indeed. Give the age of the CRT, might be time for a recap?Tempest_2084 wrote:Last but not least here is my PVM 1943MD. This is the one I'd really like to get working to be my backup, but as you can see it has some geometry issues (no convergence issues thankfully). Any suggestions on how to fix the wonky geometry here?
You ain't seen nothin', then.maxtherabbit wrote:that's about as good as I've ever seen one of those WEGAs look tbh
My suggestion for service menu stuff is to focus hard on UPIN/LPIN, PAMP, VBOW... switch back and forth between anything involving bowing and pincushioning and you can really get those corners dialed-inTempest_2084 wrote:I'm jealous.
Honestly, I think my best bet is to look for another Trinny and hope it has better geometry/convergence than my current one. I don't think there's much more I can do with it.
With my TV I spent a good hour or so playing with the service menu, but to fix what's wrong I need to either redo the yoke adjustment again and potentially screw up what I've got and/or get some magnets (not just the convergence strips I have) and play with those. As for my PVM, that I'm afraid probably needs a recap (or possibly magnets as well). Since the TV isn't a rare or desirable Trinitron model (it's a base KV27FS100) I'm more inclined to just find a better one and keep this one as a backup. For the PVM I'd love to find someone who can recap and adjust it, but as far as I know no one around here does that and there's no way I'm shipping it somewhere.kitty666cats wrote:My suggestion for service menu stuff is to focus hard on UPIN/LPIN, PAMP, VBOW... switch back and forth between anything involving bowing and pincushioning and you can really get those corners dialed-inTempest_2084 wrote:I'm jealous.
Honestly, I think my best bet is to look for another Trinny and hope it has better geometry/convergence than my current one. I don't think there's much more I can do with it.
KV-__FS100s are awesome! Just because they aren't that one with a PVM's voltage regulation doesn't mean they aren't desirable...Tempest_2084 wrote:With my TV I spent a good hour or so playing with the service menu, but to fix what's wrong I need to either redo the yoke adjustment again and potentially screw up what I've got and/or get some magnets (not just the convergence strips I have) and play with those. As for my PVM, that I'm afraid probably needs a recap (or possibly magnets as well). Since the TV isn't a rare or desirable Trinitron model (it's a base KV27FS100) I'm more inclined to just find a better one and keep this one as a backup. For the PVM I'd love to find someone who can recap and adjust it, but as far as I know no one around here does that and there's no way I'm shipping it somewhere.kitty666cats wrote:My suggestion for service menu stuff is to focus hard on UPIN/LPIN, PAMP, VBOW... switch back and forth between anything involving bowing and pincushioning and you can really get those corners dialed-inTempest_2084 wrote:I'm jealous.
Honestly, I think my best bet is to look for another Trinny and hope it has better geometry/convergence than my current one. I don't think there's much more I can do with it.
Oh I didn't mean it was a bad tv, I meant it wasn't one of those rare expensive models. To keep any Trinitron model is good enough for what I need. I'm looking for a 100 or 120 as a replacement.kitty666cats wrote: KV-__FS100s are awesome! Just because they aren't that one with a PVM's voltage regulation doesn't mean they aren't desirable...