Help Identify My Monitor!(Identified) Help with Black Bar Scrolling (Vid incl.)

[Peja]

Hey everyone, I just bought a used cabinet with some monitor issues.  I want to identify it but I can't seem to see any model numbers on it.  Unless the sticker that says OC152533-SI (Philips 32v) is the model....in that case, there isn't much information out there on it at all.  A google search for me comes up with 3 hits.  Here are a few other pictures that hopefully someone can identify it.  Thanks!!

[lilshawn]

could be a kortek or a sharp image. if you can remove the main board and shoot a photo of it, someone might recognize it.

allot of chassis are made by a different main company. even though it would have one name, it's identical to another by a different name and different company.

[Peja]

Thanks for the quick reply lilshawn.  I have actually read a lot of your posts on monitors and have found them useful.  Now if I could just figure out why I have a large black semi transparent line scrolling from bottom to top I will be about golden.  I should also probably replace the caps also.  The monitor is a little darker than I would like but maybe caps would fix that.

I will try to remove the board and get a better picture.....hopefully I hear that pop upon discharge you were talking about in your other post lilshawn.

Thanks

[grantspain]

it could be a pentanic/rodotron chassis
the black line is earth interference,either you need to earth the frame,cab or link field ground(earth) to common(ground) on the power supply

[Peja]

I will have to make sure but it looks a lot like this board......http://www.therealbobroberts.net/mon81.jpg

I will also look into those pentanic/rodtron series of monitors.

Is there a tutorial or anything on how to fix that earth interference?  I am pretty new to the whole monitor thing and just don't know how to ground the frame/cab/link field to the ground on the psu.  In fact, I am not even sure what the link field is!!

Thanks for the help grantspain!!

[lilshawn]

you just need to find a metal part on the monitor and tie it to the ground on the power supply that is powering the board hooked up to it. it appears the monitor chassis you have does match the Sharp Image link you supplied. if it is, it will have only a 2 wire connection for power... it won't have a ground.

it's kind of like the hum you get with a stereo when you have a bad connection, or when you pull out the rca connection so only the center part is connected. bzzzzzzz.

the power supply should have a terminal labelled FG or have the symbol for ground on it. connecting the monitor and the ground together should get rid of a great deal of that noise you are seeing.

[Peja]

Great thank you for the help.  So if I am reading this right(probably not), I would bolt a wire to the metal frame somewhere on the monitor and attach the other end to the FG part of the power supply that is on the board in my 3rd picture?

Thanks for helping an idiot!!  haha

[lilshawn]

sorry, i didn't notice in your third pic, you have a green wire there (red terminal crimp) screwed to the metal... check to be sure it's attached to the power supply... you should have something like this in the cabinet somewhere...



this power supply powers the game board. it has the FG terminal (third from the bottom) it should be connected ultimately to the ground pin of the plug going to the wall.

[Peja]

Perfect.....I will take a look when I run home this afternoon.  Thanks!!


So I took a look at where that green wire goes but I will have to do a little more investigating.  Here are some pictures of what I saw in there.  


The green ground goes into an adapter with the black cord that comes from the silver heat sink type part on the right.


The green wire then comes down through the cabinet and into another plug adapter to the right of this namco board.


This is the pic of my power supply.  I am not sure if that green wire goes into the FG slot or not, there are green wires in there but they don't look the same color.  Should I just run a wire directly from above on the frame to the FG terminal and bypass the clip adapters??  EDIT:  The green wire connects at that clip up top then heads down to another clip which then turns into a double green wire where one goes to the FG terminal on the psu and the other goes to that metal bracket where the power cord goes through the back of the machine in the next picture.  Also from the FG terminal a green wire connected to the other green wire goes the to the wall power plug.  There is also a black wire that goes from the FG terminal to a GND terminal on the psu.


The green wire from the monitor up above looks to be the same color that goes to this metal bracket and screw.  


Last there was one other ground wire that comes off of this metal bracket and onto the chassis that you can barely see at the bottom of the picture.  



Once again, thank you for all of your patience and help!!!

[lilshawn]

it seems everything is tied together proper...

i'm leaning towards possibly another issue, but if you could grab some pics of the issue you're having... or better yet a video, that would be awesome.

good job with the photos by the way  feel free to take a little wider shots, we can always zoom in to look at something. 

[Peja]

Alright....me again.  I ended up taking about 3 videos this morning.  I think this first one shows mostly what it is doing.....also I haven't said anything about this before but notice the vertical line that bends on the left side of the screen.  Not sure if this has anything to do with the black bar or not but I figure, one problem at a time. The faint orange/yellow glow in the top right corner is just a reflection of my light on upstairs. 

Anyways, I have 2 more videos that actually show the issue but this first one should suffice.  Just let me know if you want to see the others.

View My Video

Once again....thanks for your help!

[Peja]

Shameful Bump.....

Any ideas on how to fix the problem of the black bar scrolling in the video I posted? 

Thanks

[grantspain]

contrast and brightness are too high

[Peja]

Thanks for the response grantspain......I will mess with those controls in a bit.  After I turn the brightness down, if it is too dark, would this be due to the fact it needs a cap kit?

Thanks!

[grantspain]

Thanks for the response grantspain......I will mess with those controls in a bit.  After I turn the brightness down, if it is too dark, would this be due to the fact it needs a cap kit?

Thanks!

possible but tbh there is only normally one cap that affects the brightness and thats on the g2 circuit-normally a 250v 10uf or 4.7uf on the neck card
cap kit can't hurt though-as long as you install all the caps correctly

[Peja]

grantspain,

I messed with the controls a little bit(back of monitor and on degausser board) and it seemed to help a little bit but there is still a bar scrolling up.....just not as dark but definitely still there and noticeable.  I can't really go too much darker on the brightness or I won't be able to see the game.  

Any other ideas?  

Thanks again for the help.

[grantspain]

try removing the earth to the monitor

[Peja]

So you mean remove that green wire that goes to the back of the chassis?  Or is there a wire that is physically on the monitor somewhere??  Sorry, this is my first monitor job so I am not exactly sure which one out of the two wires screwed to the chassis is the one I should remove.

Thanks again.

[grantspain]

just that green wire,if you have ever seen a dancing stage with rolling bars thats the fix btw-remove the monitor earth

[Peja]

I removed the green wire and the screen remained the same.  Like before, it isn't as dark after messing with the brightness/contrast but it is still there. 

Thank you.

[grantspain]

do you still get it if you remove the video signal plug?

[Peja]

haha...I have no idea what a video signal plug is.  Is this down below on my game board or up above on my monitor board?  Any pictures of it?

Thanks grantspain.

[Peja]

UPDATE:

So I tried changing VGA cables but that didn't seem to help.  Line was still there.  I unplugged the VGA all together but then the screen was just black. 

Then I decided to unplug this white plug/cable(pic 1) from the jamma board that goes to the cpu part of the machine(pic 2) and the scrolling black bar is no longer there.  Of course it is just a grey screen backlit screen but the line is gone.  However, the left squiggly line is still there. (pic 3 - sorry about the picture quality, I had to turn the brightness on the camera up high).   I am not sure if this helps but maybe it is a start.  Hopefully someone has an answer. 






Thanks Peja

[grantspain]

it could an issue with the namco jvs to jamma pcb,do you have a jamma board you can use to check

[Peja]

Unfortunately, no I do not have a jamma board to check it with....I am eventually turning this into a MAME machine but do not have/know what video card I need to get to sync up with the tv. 

Since that squiggly line is on the left hand side, is there anything I can do about that for now until I research on what kind of vid card to buy?  That way when I do buy a card, it will be ready to go.

Thanks grantspain. 

[grantspain]

just try disconnecting the jamma connector and then turn the screen volts up a little bit,i have a feeling all the interference is coming from either the jvs i/o pcb or the psu

not sure what card you want to use,i know you can use a load of different ones with soft 15khz or get a dedicated arcade vga card from ultimarc and use a jpac for the controls interface

[Peja]

Ok, I think I am following you here.  The jvs i/o pcb is the board with the namco printed on it in my picture right?  And the jamma pcb is the one that is behind the metal box that speakers and vga connect to correct?

How do I go about turning up the volts up a little bit?  Is it the dials on the board that is connected to the neck of my monitor or is it on the psu itself?   I have a multimeter that I can use to test volts somewhere if need be.

Sorry about all of the stupid questions but this whole thing is new to me....thank you for being patient and teaching me.

Peja

[grantspain]

you have a jamma wired cab with a dual sync 15/24khz  monitor,the game board system is a namco system 246.The system 246 is a jvs interface game system that requires a jvs to jamma i/o to work on a jamma cab-thats the small pcb plugged into the jamma connector with the vga,audio phonos and kick harness

if you wanted to mame this cab all you would need(i ain't no mame expert btw) is a jpac interface and a pc with a graphics card capable at running at 15khz(or 24khz)-most poeple would use a ultimarc avga card to do this as it's off the shelf and comes with software and instructions-but you can use other cards using a program called soft 15k

back to the monitor,
the screen volts is a pre brightness controls underneath the focus control-both of which are located on the flyback transformer(google it)
with the jamma interface disconnected you will not have any picture of such but by turning up the screen volts a little you will see a blank raster-if you can still see the interference at this point then you know the problem is earth,mains noise or an oddball monitor fault

don't go sticking your hands in the monitor chassis area willy nilly like or you will end up rocketing across your living room

[Peja]

Perfect.....thanks for the instructions and break down.  Tonight I will disconnect the jamma interface and slowly turn up the brightness on the back of the monitor.  I have done this before so it shouldn't be a problem.  So once I turn it up, if I remember correctly the screen starts to turn white.....hopefully that squiggly line disappears.

Thanks grantspain. 

[Peja]

Ok, so I turned my brightness/voltage up in the back of the monitor after disconnecting those cables from the board and it made it a lot brighter so you can see a better picture......unfortunately, the black squiggle line is still there and the edges of the screen are distorted in certain parts as well.  Of course the scrolling black bar is gone now since the board isn't hooked up. 

Here is a picture:



Any thoughts on what this could be? Oh and the picture was taken at an angle so don't think the screen is slanted or anything.......just the black line and the edges are the problem now.

Thanks again!

[grantspain]

noe see if horizontal size or horizontal hold adjustments affect the line

[Peja]

Unfortunately no, messing with horizontal hold, width, or posi didn't change the black line.

Thanks.

[grantspain]

probably caps then-there are no guarantee's though
could be poor quality chass/tube combo

[Peja]

Alright, thank you then sir.......I appreciate all of your time and help with this.  You helped me learn a lot about my monitor.  I will update this thread after I put new caps in.  I will just order a cap kit from bobroberts and replace the ones he sends me....hopefully that works.

Thank you!!

[Peja]

I first want to thank grantspain and lilshawn for their suggestions and solutions.  The black scrolling bar is still there, but I believe that is a faulty namco/jamma board. 

However, after installing a cap kit from Bob Roberts, the squiggly black line and borders are now gone.  The colors are much much brighter as well. 

So once again, thank you for all of your help.  I appreciate it!!

Peja