Been playing on a SONY PVM-1342Q for a while now and decided to adjust some of the geometry once I got the 240p suite to work on my sd2snes. Managed to get the geometry more or less acceptable and even found the focus pot and was able to fine-tune that. However, adjusting the focus pot got me looking closer at the actual pixels and I started to notice two things. Some of the portions of the screen are perfect on convergence but there seems to be a slight "bleed" on the right edge of white text - such that the line does not form a clean-cut edge:
Is there a way of adjusting this? Or is simply the property of the aging tube?
Secondly, I noticed in another corner of my screen there's some issues of convergence:
It seems to not be uniform - there are patches with no convergence issues, and other patches like the above. I would guess that playing with the convergence rings on the tube would adjust it across the whole screen, not just certain patches. Again, can this be fixed or is it simply property of aging tech?
I don't know what to tell you about it being in patches around the screen...but I've seen similar convergence issues on several of the 20" PVM's I've own/seen/messed-with/friends bought/etc. All of those ONLY had the convergence be off on the very edge of the corners most frequently (top left/right, bottom left/right). I was told it's pretty much normal in those far corners (i.e. if it's not that bad), and if you really want you can tune it a little bit with those rings (some of the service manuals have some tips you can look into following -
but form the videos I've watched seems to be kinda a random no-rhyme or reason process - or maybe they just weren't good at explaining it).
All these 20" seem to be perfect while playing a game (sitting as close as maybe 3' away even), so I've never really worried about it. How does yours look during actual use? If it's easily noticeable even while playing a game, then, and only then would then go into it and try to tune it some more.
All my 14" PVM's (had 5ish so far) have been perfect ironically, and my two BVM's (14 and 20") likewise perfect. P.S. take this info with a grain of salt - I'm still a novice in all this - just posting my experiences and what I've researched about this particular issue so far.
Dochartaigh wrote:
All my 14" PVM's (had 5ish so far) have been perfect ironically, and my two BVM's (14 and 20") likewise perfect. P.S. take this info with a grain of salt - I'm still a novice in all this - just posting my experiences and what I've researched about this particular issue so far.
Thanks Dochartaigh. I've actually used this display for a year without noticing any of this. Only once I started adjusting the focus did I start to scrutinize each pixel. It really is a rabbit hole and I'm not sure if it was worth starting.
I have a manual but it's missing some pages. I know the convergence can be adjusted with the tube rings ("coarse" adjustment) but I wonder if there are finer convergence adjustments that can be made with some pots on the PCB and if these would help here.
I'm with you. I just recently hooked up a Raspberry Pi 3 to my BVM/PVM's (via RGBs), and could run 240p test suite for the first time (I don't use any Everdrives or such), and I almost got sucked down the "this monitor needs to be perfect" rabbit hole (basically because the BVM's really are so much cleaner in those tests than any one of my PVM's - even when the PVM is 800 TV Lines), but when I put on a game and it's being displayed on all 5 or 6 monitors at the same time, it's REALLY hard to distinguish one from another, especially when I'm back a couple feet (it all comes down to which monitor's brightness/contrast I happen to like for that certain game - which is easily adjusted on these anyway).
Honthro wrote:Been playing on a SONY PVM-1342Q for a while now and decided to adjust some of the geometry once I got the 240p suite to work on my sd2snes. Managed to get the geometry more or less acceptable and even found the focus pot and was able to fine-tune that. However, adjusting the focus pot got me looking closer at the actual pixels and I started to notice two things. Some of the portions of the screen are perfect on convergence but there seems to be a slight "bleed" on the right edge of white text - such that the line does not form a clean-cut edge:
Is there a way of adjusting this? Or is simply the property of the aging tube?
You're correct. This can be caused by picture tune ageing. In that case only real solution would be to turn down the contrast.
Honthro wrote:
Secondly, I noticed in another corner of my screen there's some issues of convergence:
It seems to not be uniform - there are patches with no convergence issues, and other patches like the above. I would guess that playing with the convergence rings on the tube would adjust it across the whole screen, not just certain patches. Again, can this be fixed or is it simply property of aging tech?
This happened with new CRTs too. It's normal for them to be a out of convergence in the corners. It can be compensated for by inserting a tiny magnet (made for the purpose) in just the right spot between the deflection yoke and the CRT. This is the way a corner convergence adjustment was done on all but the most expensive TV/monitors > 20 inch.
