Slight Blue Tint with Color Down

[Outland]

I'll report back with results! Thanks!

[Outland]

I just tried it. When I first got into service mode, the values were as follows.

B0-34
B1-38
B2-42
B3-32
B4-10
B5-7
C0-8
C1-97
C2-83
C3-111
C4-95
C5-98

I set them to the default values listed in the service manual.

B0-67
B1-33
B2-33
B3-35
B4-8
B5-8
C0-8
C1-128
C2-128
C3-128
C4-128
C5-128

Not only is the weird blue tint completely gone, the image is spectacular compared to before. MUCH brighter, I had to set brightness and picture way down before I was comfortable with it.

Am I good? Picture looks great.

[old_tv_nut]

The differences in C1, C2, and C3 had to be compensating for the old tube's cutoff values. Setting them to equal default values with good results indicates that the new tube's guns are much more balanced.

If there is no problem with the picture , I'd call it good.

[old_tv_nut]

By the way, what test pattern or image did you use?

[Outland]

Originally Posted by old_tv_nut

By the way, what test pattern or image did you use?

I didn't use anything. I just set everything back to the default values and the image looks great now with everything. I calibrated picture and brightness to 7.5 IRE and 0 IRE.

The only problem left is that it's always had a small color problem where the outline of bright objects, like red and green, have a magenta outline to the left. Here's a photo of a bright red object. Looks like red starts a little late drawing from left to right. Is this convergence?



This doesn't occur on the old TV, which is the same TV as this one but with a tired tube.

The differences in C1, C2, and C3 had to be compensating for the old tube's cutoff values. Setting them to equal default values with good results indicates that the new tube's guns are much more balanced.

Are you suggesting the tube was replaced at some point?

[Electronic M]

Convergence problems manifest as a color fringe on a white line on a black background...if it doesn't do that then it is not convergence, but more likely a video/IF issue.

[Outland]

No problems with white lines. What is IF?

[old_tv_nut]

Originally Posted by Outland

This doesn't occur on the old TV, which is the same TV as this one but with a tired tube.



Are you suggesting the tube was replaced at some point?

I misunderstood - thought you were talking about new tube in old TV.

Regarding the color fringe, it's convergence only if it's there with the color turned all the way down.

If it appears only when the color is turned up, it's something in the phase response; IF alignment, chroma alignment, fine tuning. Whether it's a problem depends on how strong it is. Analog sets are seldom completely free of this.

[old_tv_nut]

IF = Intermediate Frequency
Alignment involves aligning the Radio Frequency (RF) circuits in the tuner and the IF circuits in the IF amplifier. It must be done with an alignment generator and oscilloscope; cannot be done by eyeballing the picture.

[Outland]

I misunderstood - thought you were talking about new tube in old TV.

Ah, I see. No, I just have two, my original and the new one. They are 99% identical from the same production run. The old one I've had for years is simply getting tired, so when I saw the new one pop up for free a year or so ago I grabbed it. The new one looks like it was used much less, but had this weird tint issue.

Originally Posted by old_tv_nut

Regarding the color fringe, it's convergence only if it's there with the color turned all the way down.

If it appears only when the color is turned up, it's something in the phase response; IF alignment, chroma alignment, fine tuning. Whether it's a problem depends on how strong it is. Analog sets are seldom completely free of this.

If I turn color all the way down, the fringe is still there, everything just becomes black and white. I'll take a photo when I get a chance, as well as with some white lines.

[Popester]

You must be a gamer as that's a play station logo. My personal recommendation is to enjoy the set as is. It doesn't sound like you have much in the way of tv test equipment. You have that logo pretty zoomed in and I can see it's not a convergence issue. Guessing that tv is from the nineties or late eighties. A CRT set can never be compared to a modern HD tv but for what there technology was it was very adequate for its time. Sit back and enjoy it. Glad you got the color balance adjusted.

[Outland]

Originally Posted by Popester

You must be a gamer as that's a play station logo. My personal recommendation is to enjoy the set as is. It doesn't sound like you have much in the way of tv test equipment. You have that logo pretty zoomed in and I can see it's not a convergence issue. Guessing that tv is from the nineties or late eighties. A CRT set can never be compared to a modern HD tv but for what there technology was it was very adequate for its time. Sit back and enjoy it. Glad you got the color balance adjusted.

Good eye. Not really a gamer, the Playstation came with the TV for free, along with some games. The intro logo is a very good example of the fringe though, due to the stark red on black. I'm probably going to sell or donate it.

Correct, the TV was manufactured in November 1994. The reason I brought up the fringe is because I have the same TV (manufactured in July 1994) and while it has a very tired tube, which was the reason I picked the second one up, it doesn't have the fringe, which makes me think it's an adjustment issue.

You have that logo pretty zoomed in and I can see it's not a convergence issue.

Is the issue intermediate frequency?

[Outland]

Sit back and enjoy it.

No problem there. The old TV I've had since new, though my dad bought it. I am very cheap (and a poor student) so I hung onto it all these years, fixing little issues here and there. I simply wore out the tube, so when a second one popped up (for free), I couldn't resist continuing the legacy. Besides, I work a lot so I don't really watch much TV.

I guess you could say I like this model line from Panasonic.

[Outland]

Here is a photo of a basic grid of white lines.

[Electronic M]

Originally Posted by Outland

Here is a photo of a basic grid of white lines.

Is the color level set to min in that picture? I see red dots parallel to the line that look like some sort of IF or video stage noise/ringing issue being decoded as color dots...If it weren't for those dots it would almost look like miss convergence (though I'm pretty sure it is some sort of video ringing effect).

goofy idea: If you still have the set with the weak CRT maybe try swapping the main PCBs between the two sets. Maybe the board from your old set will drive the CRT without that ringing artifact. Be sure HV is discharged before unplugging the HV lead.