Popeye 18-z2ab monitor...stumped!

wizard154

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Hello everyone,
I have been working on my first monitor repair (Popeye Table 18-Z2AB) with blank screen

I replaced these components:
B+ pot
LA5112N Regulator (from Twisty Wrist arcade)
B+ filter capacitor with a 470uf/200v (from Bob Roberts)
Deluxe cap kit

After all the new components, monitor has come to life and is perfect----( on the bench)

Now, my problem is that when I drop the monitor back into the table, the colors are all screwed up.

It looks great out of the machine and on the bench, but I did notice if I turn the monitor left or right the colors change, even on the bench.

On the bench, I have positioned monitor with screen facing up to imitate its normal position in the cabinet and it looks great. But as soon as I drop it into the cabinet the colors change.

This has got me stumped.

Anyone have any idea what is wrong?

Thank you in advance.
 
Unshielded speakers? Transformer too close to screen?

Hi,

Thank you for your help.

I have changed nothing in cabinet, everything is factory.

I do want to backup and say that yesterday I had the monitor in cabinet and it was perfect, but today when I turned it on and the screen was jumping and monitor whining.

I removed monitor and turned down B+ pot and everything was ok. Why the B+ voltage changed I don't know.

Then I replaced monitor back into cabinet and the colors changed.

Also, there is a pretty loud humming when speaker is plugged in.

If it is the speaker, the colors should be correct if I unplugged the speaker wire, correct?
 
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The jumping & whining sounds very much like a sync issue. Probably a bad connection somewhere.

Unplugging the speaker will have no effect, if it's unshielded the large speaker on the back of it will discolour the screen whether it is being fed a signal or not.
 
but I did notice if I turn the monitor left or right the colors change, even on the bench.

This is normal, and can happen with any monitor. It's the Earth's magnetic field messing with it.

The issues you're having when installing it in the cabinet is also magnetism. Hewitson outlines some of the possible culprits. Also, did you plug the monitor's degausssing coil back up after working on it?

Edward
 
This is normal, and can happen with any monitor. It's the Earth's magnetic field messing with it.

The issues you're having when installing it in the cabinet is also magnetism. Hewitson outlines some of the possible culprits. Also, did you plug the monitor's degausssing coil back up after working on it?

Edward

Hi,

I thought it might have something to so with earth's magnetic pull, but what can I do to compensate.

Yes I did re-plug in the degaussing wires, but actually I do not know exactly what degaussing does.

If I unplug the degaussing wires and plug back in will maybe that help me.?

I was just out tinkering with it and it is weird.

If I turn monitor screen straight up the colors change gradually until they are all messed up when I am totally perpendicular.
 
I tried the drill but it had some effect while degaussing but soon as I pulled the drill away nothing had changed.

But, I then turned the machine so it's colors where the worst and waved a strong magnet from a computer hard drive over the screen it different areas and the colors returned to normal

Hopefully it will last.
 
a magnet is the absolute worst thing you could do to a monitor.
my bet is that it will return worse since you used the magnet.


use the drill will the game is on.

Peace
Buffett
 
a magnet is the absolute worst thing you could do to a monitor.
my bet is that it will return worse since you used the magnet.


use the drill will the game is on.

Peace
Buffett

Oh boy!, Damn, I knew it couldn't have been that easy.

I'll keep an eye on it and re-use the drill if it returns.

Thanks
 
I did some magnet vs monitor goggling and found this article

http://answers.yahoo.com/question/index?qid=20060723132940AAZtbwh

Best Answer - Chosen by Asker

"You need to preform a process called "degaussing" to your TV. It is a simple fix. You just need either an electro magnet, or a stronger magnet that was used to damage the set. Take the magnet and start waving it over the screen as close to the actual screen you can get with out actually making contact.After moving the magnet over the damaged area in a circular motion for a few revolutions move the magnet towards the closest corner of the screen and then just as if you were wiping off the screen swoop the magnet over the corner of the screen then completely away from the TV. It may take a few times repeating this motion to fix the problem, but it does work. "


So, Since the hard drive magnet I used is so strong I may have successfully "degaussed" it.

Possible??
 
it may be possible.

but it does not do it correctly.

you need an alternating magnetic field to do it properly.

that is what a drill/coil/wand does.

all you do with a magnet is pull the magnetic field in one direction not in opposing directions. so all it does is pull one way and can throw off the rest of the screen in the long run or magnetize a metal part on the monitor/frame some where and that is what you are trying to eliminate by degaussing the monitor in the first place.

Peace
Buffett
 
To add to what buffett has said, using a strong magnet can also do permanent damage to the shadow mask, rendering the tube absolutely useless.
 
I have another question concerning the monitor.

In these forums while searching for info during the repair, the B+ voltage is always mentioned as 108vdc.

I have this Sanyo 18-Z2AB out on the bench with screen pointing up and running 12 hours straight. The B+ voltage has varied from 105vdc to 109vdc during this time with no ill effects on the screen, except for a constant slight wave.

Is this normal?
 
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