WG 25K7195 (k7000) Color issues - no red

[ZEN]

I serached forums for a while with no definitive answers so i pass on to you experts

I have a working W/G K700, specifically a 25K7195 monitor.  ArcadeVGA card working it, everything is great except little to no RED, this is after adjusting all the pots (also black levels on sister board).  I am not running a JPAC, and I have no video amplifier,  could this be the culprit?, I would not assume so since all else looks great, and Ultimarc noted WG monitors dont need amplified.

Does the standard CAP kit solve color issues?  I guess I never thought this was a reaosn to do caps, but since this is my first foray into Mame to arcade monitor I need to learn.  Any help would be great.

I dont think the breakout cable is bad, I have two K7000 monitors and the red level in that one, when hooked up showed up considerably more (that test was on a monitor that is not as crisp).

I am missing somthing probably obvious, any help I would appreciate..

[SirPeale]

The reason you don't find a definitive answer is because there isn't one.  There are several reasons for missing colors:

1) bad color drive transistor on the neckboard

2) bad input transistor on the chassis

3) bad input cable

4) broken color input on the chassis

5) failing tube and/or failing red electron gun in the neck of the tube.

I've highlighted that which I think it is, since it's a K7000.

If you can find access to someone with a rejuvenator, you can test your tube to see if that's indeed what it is.  And possibly repair the problem for the time being.

The color is there, right?  Just really dim?

[Ken Layton]

Bad tube, especially if the tube was made by Zenith. Connecting it to a rejuvenator to test it will confirm if the tube is bad or not.

[ZEN]

the color is there, but just rather dim, the red posts on the board really only change the spectrum and it reds up the backgriund a little.
-the tube is a Zenith, and it operates great except for the low red.
-I am about to buy a new 25" now I have this problem, do you guys reccomend I go a certain route for a decent price....

[SirPeale]

A rejuvenator might be able to help the tube.  Only way to tell is to hook the tube up to it.  Post your location, perhaps a member is nearby that can help.

Other than that, tube swap.

[ZEN]

I am located in the Lincoln/Omaha Nebraska area...any outside chance someone out there has one? 
-Not sure I could handle a tube swap or not, saw the examples of such on the web.  At this point, it may be best to buy a new monitor, what existin,g 25 is best bang for yer buck?
  I am on my 3rd 25", thus I am frustrated....

 I may try a cap kit on a 257131 that also works....


Thanks Ken and Peale for your help now and in the future

[qrz]

ask around for the name of any former TV repairmen.

most of us still have a lot of ....... er , stuff 

and yes , zenith did have some crappy crts mid 90's .    mostly grid shorts (that are easy to circumvent )

trash day is a good time to locate a donor crt . assuming a rejuve doesn't do the trick .

qrz