Worn CRT or other issue? (Sony)

[JohnCT]

Originally Posted by grossbard

quick update: Finally added RGB to this TV like I'd planned for a while. It was dead simple, just injected into the CC daughterboard header.

Looks WAY better than even s-video. Very crisp image.

There's still a red bias to the gray scale. I stuck a colorimeter on it and it confirmed it for me. There's no red cut or red gain in the service menu so I wasn't able to dial it down. Any suggestions? Is the red gun working harder to compensate for the other guns? Also, I seem to recall reading a specific reason why sony CRTs don't have red cut/gain available to adjust but I can't quite remember.

If it's favoring the reds, then the green and blue aren't doing their jobs, which is pretty typical for a TV like this with a bunch of hours on it.

If the CRT is strong, you don't need those other adjustments. I would guess it was a cost decision.

When you're dealing with an unbalanced tube, the more adjustments you have the better. One manufacturer (can't recall now) had low, mid, and high drives for all three guns in the service menu.

John

[grossbard]

Originally Posted by JohnCT

If it's favoring the reds, then the green and blue aren't doing their jobs, which is pretty typical for a TV like this with a bunch of hours on it.

If the CRT is strong, you don't need those other adjustments. I would guess it was a cost decision.

When you're dealing with an unbalanced tube, the more adjustments you have the better. One manufacturer (can't recall now) had low, mid, and high drives for all three guns in the service menu.

John

Thats what I was afraid of. Well, I'll just enjoy this TV while it lasts and keep an eye out for possible tube swap candidates, but 20" Sonys are becoming quite rare around here.