View Full Version : Cap Kit did next to nothing....see pics...advise needed
tholly
04-03-2004, 09:59 PM
The cap kit from Zanen just got done being put on my Nintendo vs. Monitor with little success. I have before and after pictures.....and there really isn't much of a change. Anyone have any ideas what else could be wrong or what to try?
Before (tinted plexy glass cover down which hides screen burn)
http://home.ptd.net/~tholly/1.jpg
After (tinted plexy glass cover up, don't mind the screen burn)
http://home.ptd.net/~tholly/2.jpg
http://home.ptd.net/~tholly/3.jpg
FABombjoy
04-03-2004, 10:47 PM
Trippy...
Looks like the red is completely gone in the after pics. How are the connections on the neck board?
Have you gone through the convergence procedures in the service manual? It looks like the yoke is way off kilter and/or the convergence magnets are all wrong.
tholly
04-03-2004, 10:58 PM
Trippy...
Looks like the red is completely gone in the after pics. How are the connections on the neck board?
Have you gone through the convergence procedures in the service manual? It looks like the yoke is way off kilter and/or the convergence magnets are all wrong.
Well...my father was the one that worked on this. He works on electronics for a living, but not on anything like this. Also, I don't have the service manual, so I can't go through that unless you have a link or scan of the manual that you could possibly share with me.
Since he doesn't specifically work on monitors, he would need an explaination of what the yoke is or how to adjust it or how he would fix the convergence magnets.
Any help would be greatly apprecitated. If my father has directions and knows what parts he needs he can fix it, he just needs to know what to do.
Thanks.
FABombjoy
04-04-2004, 04:20 AM
Well, I don't have a copy of that particular monitor, but the procedures are fairly generic between vendors. See if you can search around online for a PDF of a different Sharp monitor.
The yoke is what provides deflection for the electron stream. It is the bell-shaped thing on the neck of the tube that's wrapped in magnet wiring. If it's out of alignment, the paths of the electrons go all over the place causing issues like what you're seeing.
Some monitors have the yoke as far up on the tube as it can fit, and some use rubber stops to hold it in proper position. This is why having the proper service manual is important, as it's the only thing that can tell you for sure. However, seeing how messed up the image is, it probably couldn't hurt to loosen the clamp and move it around a bit to see if it helps anything.
Once the picture is squared up as best as possible by moving the yoke, then the convergence magnets come into play. There are a few metal rings on the back of the tube (near the connection to the neck board), and they usually have tabs sticking out so they can be adjusted. These are used to fine tune the color convergence and purity. Again, the service manual will have the proper procedure.
The manual will also have the proper procedure for setting the HV or B+ voltage on the monitor. It's good to verifiy the voltages to ensure that the monitor works properly and has good picture.
Sylentwulf
04-04-2004, 07:13 AM
Holy crap, yeah that's not cap's at all, that's a SERIOUS convergence issue.
tholly
04-04-2004, 02:39 PM
Can anyone help me out with a service manual, or a link to where I can see a scan of one?
Sylentwulf
04-04-2004, 02:56 PM
What's the monitor medl name/number? I should have the owners manual in .pdf format somewhere.
tholly
04-04-2004, 03:22 PM
Sharp
XM-1801N 19" color- Nintendo
tholly
04-04-2004, 08:03 PM
I'm not home to work on it, but my father is and he said that he got the picture a little straighter, but it doesn't fill up the screen yet and the only colors he is getting really good are green. I haven't seen it, but he said the words are clear and easy to read now.
Hopefully Sylentwulf can get me the .pdf of the monitor manual and possibly point us in the right direction.
RichD
04-04-2004, 10:07 PM
Here is a site with the PDF for the Vs. UniSystem:
http://www.mikesarcade.com/arcade/manuals.html
Here is a site with arcade monitor manuals including the Sharp XM-2001N:
http://www.mikesarcade.com/arcade/monitors.html
The sharp manual does show you how to adjust the yoke.
tholly
04-09-2004, 10:01 PM
well, i tried a cap kit, adjusting the yoke position, adjusting the convergence magnets, adjusting all the knobs such as r, g, and b gain and i tried adjusting the horizontal coil thing with a tweaking tool. nothing helps to get the horizontal size wider. the whole picture is crushed into the center 1/3 of the monitor. vertical size is fine.
i was wondering if anyone has an idea on how to adjust the horizontal size that we are not thinking of, short of having to replace a part. i am thinking there might be a bad transistor, but i wouldnt really know for sure. any help would be greatly appreciated.
AlanD
04-09-2004, 10:27 PM
I don't have the schematic in front of me for that monitor but is the horizontal width coil in good shape? It is usually white plastic with wire wrapped around it. Sometimes it cracks or the internal slug is broken. The soft metal slug inside will shatter if you try and turn it with metal tools. (Tust me I know) Go to Rat Shack and get a set of TV tools which are all plastic for I think around $6. I would start in that area for the problem.
AlanD
AlanD
04-09-2004, 11:05 PM
Oops I can't read very well. See that you did work on the horiz. coil. Mainly just make sure the coil hasn't broken loose from the board underneath. If worst comes to worst I may have an old monitor chassis for Nintendo (unknown condition) I'll give you for shipping. At least you may get some parts off of it you need. Let me know if I can be more help.
DasCrewShtool
04-10-2004, 07:09 AM
do you plan on doing more of this, if so sencore makes really good tube analyzers, it can tell you where your voltage is off, and also can rejuve the tube, you can usually pick one up fairly cheap on E-Bay, if you plan on using this on newer tubes you will have to download the info for newer tubes, I have one that was made in the early 80's that has served me very well. I am actually an engineer for a TV station, if you need further help we can discuss this more thouroughly, I have worked on many monitors.
tholly
04-10-2004, 12:54 PM
Someone told me that I may need to use a Degaussing Coil on the monitor. Could that be a possible solution, or is it not worth trying?
tholly
04-10-2004, 01:50 PM
I asked a friend of mine (who's much more experienced with arcade monitors than I) what could cause that, and he said most likely the yoke being out of position (either too close to the tube, or too far away).
I hope you marked the position of the convergence rings *before* you started moving them, otherwise you'll probaby never get the convergence back to where it should be again.
well....i ruled out the yoke being outta position being we have tried adjusting it the full length ... all the way forward and all the way away...the was little to no change in the picture
the convergence rings were marked with white glue, so i can get those back to where they were, but adjusting them and the yoke did nothing.
tholly
04-11-2004, 01:46 PM
well, i tried a degaussing coil on the monitor too, which did nothing. i have no idea where to go from here, or what else to try.
chadtower
04-12-2004, 10:05 AM
At this point, bring it to a quality repairman or replace it.
tholly
04-12-2004, 12:34 PM
At this point, bring it to a quality repairman or replace it.
yea, i think that is probably the plan.....they just arent easy to find around me....
Well... if you need to adjust the width, you need to actually adjust the ones marked vertical, since the monitor is oriented vertically. About the missing red color, have you adjusted the potentiometers on the neckboard (the small square board at the end of the tube)?
Do you have a picture of it as it sits now?
Anyway, it looks like it's a relatively minor problem since everything actually works, so it shouldn't be a big deal to fix (looks like the yoke is out of alignment, you said that you moved it back and forth, did you try actually spinning the yoke?). Anyway, I'd go to www.klov.com and ask on their message board... a guy named KenLayton will for sure help you out (he knows what he's talking about ;) ).
DogP
tholly
04-19-2004, 01:44 PM
Well... if you need to adjust the width, you need to actually adjust the ones marked vertical, since the monitor is oriented vertically. About the missing red color, have you adjusted the potentiometers on the neckboard (the small square board at the end of the tube)?
Do you have a picture of it as it sits now?
Anyway, it looks like it's a relatively minor problem since everything actually works, so it shouldn't be a big deal to fix (looks like the yoke is out of alignment, you said that you moved it back and forth, did you try actually spinning the yoke?). Anyway, I'd go to www.klov.com and ask on their message board... a guy named KenLayton will for sure help you out (he knows what he's talking about ;) ).
DogP
sorry about taking so long to reply, but as the school year winds down i have a lot of exams coming up this week and next and i have been kinda busy. i am away at school, so i dont have a current picture, but i can probably get one this weekend because i believe i am going home. as it sits now, the colors do not seem to be meeting up correctly and all the picture is crushed into the middle 1/3 of the screen
once i have some extra time i will go to klov and look for kenlayton. also, my dad thinks a guy he knows is coming to look at it, so hopefully he will be helpful also
thanks for your reply
MrKitt
04-19-2004, 04:26 PM
Holy crap, yeah that's not cap's at all, that's a SERIOUS convergence issue. LOL
hence it looks like convergence but still to accurate on both sides to be that kinda of issue.. try replacing whatever memory circuit the board uses probably a 24LC02 or something like it look for a small 8 īpin ic chip. mostly when a new empty chip is put in, the screens cpu blasts in default values.