shmups.system11.org

Shmups Forum
 
* FAQ    * Search
 * Register  * Login 
It is currently Sun Nov 18, 2018 11:49 am View unanswered posts
View active topics



Post new topic Reply to topic  [ 18 posts ] 
Author Message
 Post subject: Fix rotation on CRTs?
PostPosted: Tue May 03, 2016 3:42 pm 



Joined: 03 May 2016
Posts: 11
Hi, I have a few CRTs with this issue, presumably due to shipping. I'm not entirely sure if the whole tube is slightly out of whack or if it's something with the yoke, but the symptom is always the same, the image appears to be rotated to some degree, sometimes clockwise, sometimes counterclockwise. No way to do anything about it in the service menu. Is there any good guide for fixing this problem?


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Tue May 03, 2016 4:35 pm 


User avatar

Joined: 17 Apr 2008
Posts: 1570
A picture would help


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Tue May 03, 2016 5:34 pm 



Joined: 23 Dec 2015
Posts: 169
Some late-model Trinitrons have a rotation option in the service menu called TROT.

Most of the time, the only fix is to open the back, slightly loosen the screw holding the yoke to the tube neck, and manually rotate the yoke yourself.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Wed May 04, 2016 2:30 am 



Joined: 29 Apr 2015
Posts: 89
If you're seeing the same thing on multiple CRTs, it's probably due to earth's magnetic field than shipping damage.
A number of late-model CRTs - not just trinitrons - had options to correct for this.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Wed May 04, 2016 9:40 am 



Joined: 25 Jul 2008
Posts: 1000
Location: Leeds
+ just to check - you're definitely talking about (the typically hidden on consumer sets) service menu and not the regular adjustment menu?

Specific crt models in question? (perhaps someone has some specific advice/experience).

Large metal girders/construction elements can also distort magnetic fields in a similar manner (though tend to be a wavey effect in relation to a bar length) - though as others noted rotation likely to be due to location/earths magnetic field. Most screens should have corrections for this very reason (manufacture in one place, ship to all over the world).


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Wed May 04, 2016 8:27 pm 



Joined: 03 May 2016
Posts: 11
As far as examples go, here is a light case of it on a Sony KV-14LT1E. http://i.imgur.com/JE9tK37.jpg Sorry in advance to everyone who has the same issue on their CRT and was oblivious to it until now :) This is a 2000 model and there is no option for rotation in the service menu, but I have also seen worse cases on PVMs and early 90s Trinitrons without service menu. I don't care about the other geometry imperfections with CRTs, but this one really sticks out to me.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Wed May 04, 2016 9:45 pm 


User avatar

Joined: 17 Apr 2008
Posts: 1570
eliteshmupper wrote:
As far as examples go, here is a light case of it on a Sony KV-14LT1E. http://i.imgur.com/JE9tK37.jpg Sorry in advance to everyone who has the same issue on their CRT and was oblivious to it until now :) This is a 2000 model and there is no option for rotation in the service menu, but I have also seen worse cases on PVMs and early 90s Trinitrons without service menu. I don't care about the other geometry imperfections with CRTs, but this one really sticks out to me.


My Hi-scan trinitron actually had a rotation option in the user menu, not service menu.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu May 05, 2016 5:45 pm 



Joined: 25 Jul 2008
Posts: 1000
Location: Leeds
It may require a different button combinations, but I don't think I've seen a 90s trinitron without a service menu. Some early ones I think can be accessed by both holding both volume buttons (on the set not on the remote ... or was that both program buttons ... one of the two :)

Service manual annoyingly enough suggests the 21 inch could adjust rotation from regular menu... there's some other references to rotations but not sure if it's what we're after. You might be out of luck with rotations on the 14" model unless you manually adjust.

http://j.mdownload1.free.fr/Schemas/Son ... 14LT1x.pdf


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu May 05, 2016 8:25 pm 



Joined: 23 Dec 2015
Posts: 169
BazookaBen wrote:
eliteshmupper wrote:
As far as examples go, here is a light case of it on a Sony KV-14LT1E. http://i.imgur.com/JE9tK37.jpg Sorry in advance to everyone who has the same issue on their CRT and was oblivious to it until now :) This is a 2000 model and there is no option for rotation in the service menu, but I have also seen worse cases on PVMs and early 90s Trinitrons without service menu. I don't care about the other geometry imperfections with CRTs, but this one really sticks out to me.


My Hi-scan trinitron actually had a rotation option in the user menu, not service menu.


A lot of late model Trinitrons have this, but it rotates in big chunks... for very fine rotation, the service menu setting called "TROT" can let you rotate at fractions of degrees.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Wed Jul 11, 2018 3:18 pm 


User avatar

Joined: 24 Oct 2017
Posts: 15
Location: London, UK
On a tangent, my Trinitron's image rotates slightly when I put it in the desired position in my room. It's ridiculous and annoying but true. Don't think it's because of any metal furniture or other devices, can only guess it's metal or power cabling in the walls or something. When I plug it in a different room in the house it goes straight again. I'm just thankful I worked this out before i tried messing with the deflection yoke, which I was considering.
_________________
Top five: R-Type, Gradius Gaiden, Tatsujin Oh, Flying Shark, Raiden


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Wed Jul 11, 2018 3:26 pm 



Joined: 02 Mar 2017
Posts: 678
On PVM's, unless you have a higher end model like a 20L5, 20M4, etc. you'll have to manually rotate the yoke. Even their 14" variants of those higher-end models don't have this in the service menu if my memory serves. REALLY annoying when a $400 MSRP Consumer TV has the option to rotate in a menu but the $1,800+ PVM doesn't...

And this is the single most common tweak I have to do to PVM's when they come in - like a good 60% of them need it done.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu Jul 12, 2018 5:59 am 



Joined: 01 Feb 2016
Posts: 42
Dochartaigh wrote:
On PVM's, unless you have a higher end model like a 20L5


My 20L5 has a slight rotation problem, but I was never able to find a menu setting that rotated the picture, even in the service menu.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu Jul 12, 2018 7:52 am 



Joined: 01 Jul 2016
Posts: 38
I had this issue in one of my PVM's due to shipping . PVM monitors don't have the rotation setting, I fixed it by slightly rotatating the yoke.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu Jul 12, 2018 9:50 am 


User avatar

Joined: 08 Mar 2012
Posts: 552
Location: Finland
gray117 wrote:
Large metal girders/construction elements can also distort magnetic fields in a similar manner (though tend to be a wavey effect in relation to a bar length) - though as others noted rotation likely to be due to location/earths magnetic field. Most screens should have corrections for this very reason (manufacture in one place, ship to all over the world).


I had this problem because of a small Ikea table lamp once.
_________________
~The artist formerly known as TheRedKnight~
My fighting game photography: videograpple.tumblr.com


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu Jul 12, 2018 12:28 pm 


User avatar

Joined: 19 Feb 2012
Posts: 232
Location: United States
I assume you do this while the crt is powered on when adjusting yoke.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu Jul 12, 2018 3:06 pm 



Joined: 02 Mar 2017
Posts: 678
jd213 wrote:
My 20L5 has a slight rotation problem, but I was never able to find a menu setting that rotated the picture, even in the service menu.


I tried to find my notes for this (and failed), but I believe it's called landing (only have my 14L5 out now otherwise I would double-check). It only rotates it a little bit, FYI.



ChuChu Flamingo wrote:
I assume you do this while the crt is powered on when adjusting yoke.


Yes. In a nutshell, loosen the clamp screw near the guns (some models have two), and I always wear rubber gloves just in case, and GENTLY muscle it (rotate) to one side. Some funny sounds can occur as the epoxy or whatever they use breaks loose, and you can loose a rubber shim if it's ancient and the glue it totally gone, but that's about it. Tighten the screw back and it should be good (just got done doing this to like 6x PVM's last week).


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu Jul 12, 2018 6:45 pm 



Joined: 21 Aug 2016
Posts: 347
Does anyone happen to have pictures of the process? I would like to rotate the yoke on my PVM to fix the rotation and it seems pretty simple, but I just don't want to mess it up and I've not had much luck finding exactly what to look for.

Edit: j/k, this video explains it all and it looks super, super easy: https://www.youtube.com/watch?time_cont ... zdZZbI1BzU.


Top
 Offline Profile  
 
 Post subject: Re: Fix rotation on CRTs?
PostPosted: Thu Jul 12, 2018 8:32 pm 


User avatar

Joined: 08 Jan 2016
Posts: 446
Location: San Jose, CA
Landing affects purity.
_________________
Image


Top
 Offline Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 18 posts ] 

All times are UTC


Who is online

Users browsing this forum: Google [Bot], Syntax, the Goat and 10 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Space Pilot 3K template by Jakob Persson
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group