Is this a monitor issue?

toolguy

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Could someone please help? My Ms Pac CT just started doing this. I feel its a baord issue, but was wondering what everyone else thinks?

4600 WG, its been capped when I restored it and all solder joints re-flowed. It was fine until last Sat.

Here's what's wrong...

All the white i.e. high score, P1/P2 score, and dots, all have blue tint behind them. Two of the ghosts are the same color, red/orange, ms pac and the attract marquee "Staring Ms Pac" are all orange, two of the ghosts have blue eye pupils, the remaining ghosts are normal black pupils, and the cyan ghost is now blue.

If a monitor issue, can anyone tell me what could be wrong?

Thanks,
 

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Looks like your convergence is off. Did you bump the yoke or drop the top harder than normal?

Certainly could be a board issue, but I would verify the monitor convergence first.
 
One monitor issue is a convergence problem.

It's possible you have a green problem, too.

Other than that, it seems like a board issue....
 
Looks like your convergence is off. Did you bump the yoke or drop the top harder than normal?

Certainly could be a board issue, but I would verify the monitor convergence first.

It started doing this when I left it on. It was fine for an hour or two and then did this. I did not bump the yoke though, have not disturbed it in a long time.
 
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Well, you could start by adjusting the green color knobs on the neckboard to see if they help.

Don't know when it was recapped last, and if it IS missing green, it could be a tube issue also...
 
Well, you could start by adjusting the green color knobs on the neckboard to see if they help.

Don't know when it was recapped last, and if it IS missing green, it could be a tube issue also...

Just tried the green adjustment and all it did was make the black darker.

I recapped the monitor, so its all new, unless a new cap blew out on me I guess.


I also searched convergence on the site and it appears the purity rings have to be adjusted. Unless I'm wrong here?
 
Just tried the green adjustment and all it did was make the black darker.

I recapped the monitor, so its all new, unless a new cap blew out on me I guess.


I also searched convergence on the site and it appears the purity rings have to be adjusted. Unless I'm wrong here?

That's correct. There are instruction in the 4600 manual.

Check to see if you have a green signal going to the neckboard...
 
That's correct. There are instruction in the 4600 manual.

Got 4600 manual, will check convergence...

Check to see if you have a green signal going to the neckboard...

One more quick question mod, how do I check for a green signal?

Never done that before, hope I can do it with a DVOM as that's all I have.

Do I check continuity on the green yoke color transistor legs?
 
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Find the wiring to the neckboard for the red/green/blue. Measure the DC voltage at that point (red on color, black on frame). Usually you'll get about 6vdc. If you have it on the red/blue, and 0 on the green, then that tells us something is wrong on the main chassis, the wiring to it, or the game pcb. If all three colors are measuring the same, then we concentrate on the neckboard or tube.

And don't forget that there are TWO green adjustment pots...
 
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