Yet another Zenith To identify

[zeno]

Chromatic switch works like this.
OFF ( not red ) works off the normal controls for brite, color, tint
& picture ( contrast ). You can adjust them by hand.
ON ( RED ) turns all those controls OFF. The 4 controls are hollow
& have a duplicate screwdriver control behind the regular control.
When ON you adjust for best pix. It also turns on ATG
( auto tint guard ) that has nothing to do with your troubles.
For now just run it in off.

If you havent check the long package on the 9-88-? They were a
"check EVERY ONE" for cold solder. Most had cold joints after a few yrs.
The 9-89 probably is OK & almost any problem is related to one
color. IIRC it had just the video out & 3 color out transistors.

We refer to short hand module part numbers. Keep in mind many are
newer versions and have more numbers like 9-88-01, 9-90-02,
150-190-01 etc. You need them to get the RIGHT replacements !

Lastly with good grey scale & the G-2 controls at about 25%
you have a as new or nearly CRT.

73 Zeno

[Dreamsbeard]

Originally Posted by zeno

Chromatic switch works like this.
OFF ( not red ) works off the normal controls for brite, color, tint
& picture ( contrast ). You can adjust them by hand.
ON ( RED ) turns all those controls OFF. The 4 controls are hollow
& have a duplicate screwdriver control behind the regular control.
When ON you adjust for best pix. It also turns on ATG
( auto tint guard ) that has nothing to do with your troubles.
For now just run it in off.

If you havent check the long package on the 9-88-? They were a
"check EVERY ONE" for cold solder. Most had cold joints after a few yrs.
The 9-89 probably is OK & almost any problem is related to one
color. IIRC it had just the video out & 3 color out transistors.

We refer to short hand module part numbers. Keep in mind many are
newer versions and have more numbers like 9-88-01, 9-90-02,
150-190-01 etc. You need them to get the RIGHT replacements !

Lastly with good grey scale & the G-2 controls at about 25%
you have a as new or nearly CRT.

73 Zeno

the 9-88 looks fine, and after letting the TV play a few more hours and adjusting the "brightness range" I would say that this TV has no brightness problem after all. Picture is amazingly good! (after convergence and focus adjust of course)

Now I really need to get that sound sorted out. I powered the TV today and the sound came back, but with that god awful snow sound. Speaker seems fine (reads 15 ohms). Took a picture of the sound board, would it be possible that the volume wire is not pluged in the right place? (look at the sticker on the bottom left corner).

Also , but this is a minor problem, I seem to be at the extreme (no more range) for the focus adjustement. Fortunatly the focus is good enough, but I can go no further on the adjustment and I do not have sufficient range to see the focus go bad after the sweet spot...does it means that I would need a new focus divider?

Edit

Made a video of the problem : https://youtu.be/2rv4x7kawYg

[zeno]

Focus is almost always the tripler. Check it for cracks,
it may start arcing on the first hot humid day. Also watch for
arcing at CRT socket but you should smell & hear that.

Dont remember any audio problems, odds are 99% its
on the module.

73 Zeno