WG Chassis Questions

cpu.slave

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I have a 19K7901 which never looked right - had issues with brightness washing out all the colors, colors being weird, etc. and I could never adjust it to look correct. After plenty of reading I figured a new cap and fly kit would help. I finished the work last night, reassembled and it really hasn't changed much - now where it should display black it's blue, the whites are more yellow, slight diagonal lines. An hour of adjusting and that's the best it gets. So, any ideas as to what to look at? Could it be the neck board, tube, or chassis?

I don't have a lot of experience with arcade displays and the only other one I have is a 19k4901 - can I swap the chassis to that tube to see if it's a problem with the tube itself or at least confine the problem to the neck board or chassis? Can a tube have a problem?

If it matters, the 7901 is in a Road Blasters and the 4901 is in a Pole cockpit.
 
Since you have very little monitor experience, the answer is no. You would have to swap yokes which is really gonna make things worse for you when it comes to converging. On top of this is the possibility that the tube pinouts are different
 
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Thanks for saving me from making an ugly situation worse. Days like this I'm wishing I stuck with pins...

So the yolk is more or less chassis dependent, based on pin out. Is there anything I could look at to try to narrow down the problem? I mean short of gamble on ebay for a 'working' chassis' that may or may not be the actual problem?
 
brightness/contrast tips:

brightness, turn all the way up, then turn it down until the black is black (not greyish)

contrast, turn all the way up, then turn it down until your text no longer smears.

can't think of a way to adjust screen. I guess you keep raising that up until your picture is no longer super dark.
 
If you are unable to get your colors uniform, this means one of two things. Either you don't know what you are doing on color adjustement, or the tube is bad (requiring replacement or rejuvenation).
While attempting to adjust to the test screen, the blue adjustments do little to nothing while the blue itself is overpowering the red and green. For now all I can do is adjust enough to get the game playable with the colors being off - back to where I started essentially.

Just to satisfy a curiosity, and to eliminate the video board itself from being the problem however remote the possibility, I pulled the two machines close enough to run the video from the road blasters to the 4901 in the pole (after verifying cable order) - it was a nice clear and clean picture with all the colors being correct.

So I guess I'm now on the hunt for a compatible working tube... I can't justify a rejuvenator purchase to try and see if it will work - especially on a tube with plenty of burn.

I least I learned I can re-cap a chassis without damaging either it or myself. Thanks for all the help.
 
BTW - if this monitor chassis is the version that has the little bitty board attached to the top of the left wall with two wires going to it, your brightness and colors can be affected if one of those wires breaks loose...
 
I have a WG K7901 doing the exact same thing as the original poster described. Based on the responses either the pots are not adjusted correctly or the tube is bad? I have adjusted the various pots myself (not a newbie at this), in every possible configuration, so those are good. That leaves me with a bad tube? Is everyone in agreement on that?

I recall years ago hearing other causes, but cannot find those posts now. :(

Scott C.
 
While attempting to adjust to the test screen, the blue adjustments do little to nothing while the blue itself is overpowering the red and green. For now all I can do is adjust enough to get the game playable with the colors being off - back to where I started essentially.

Just to satisfy a curiosity, and to eliminate the video board itself from being the problem however remote the possibility, I pulled the two machines close enough to run the video from the road blasters to the 4901 in the pole (after verifying cable order) - it was a nice clear and clean picture with all the colors being correct.

So I guess I'm now on the hunt for a compatible working tube... I can't justify a rejuvenator purchase to try and see if it will work - especially on a tube with plenty of burn.

I least I learned I can re-cap a chassis without damaging either it or myself. Thanks for all the help.

I know it's an older thread... but if you haven't done anything with this yet, take the monitor to a TV repair center. They'll rejuvenate for you for, probably, next to nothing.
 
I know it's an older thread... but if you haven't done anything with this yet, take the monitor to a TV repair center. They'll rejuvenate for you for, probably, next to nothing.

If they actually have a rejuvenator. Local place in town I went to check out a tube, and they got rid of theirs because they never used it. I finally picked one up for myself.
 
If they actually have a rejuvenator. Local place in town I went to check out a tube, and they got rid of theirs because they never used it. I finally picked one up for myself.

I wouldn't trust any TV repair center without a rejuve. As far as I'm concerned, they might as well say they don't have any electrical outlets in the shop.

But the times being what they are... I guess they can still operate without out because of all the new fangled LCD and plasma doodiebops. These are mad times, I tell you... MAAAAAAD!
 
But the times being what they are... I guess they can still operate without out because of all the new fangled LCD and plasma doodiebops. These are mad times, I tell you... MAAAAAAD!

That's exactly what they're doing. The shop has been around forever, and last time I went in I think I saw one tube TV in the "bay" and ten LCD.
 
I laugh when I drive by the TV repair shop near me... it still says "TV & VCR Repair" :D . I REALLY want to bring an old clunky VCR in there and get a repair quote :p .

DogP
 
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