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Main => Monitor/Video Forum => Topic started by: konp on October 27, 2014, 07:17:49 am

Title: Sony Trinitron - Sharp in the middle, fuzzy on the borders. How would I fix?
Post by: konp on October 27, 2014, 07:17:49 am

I'm thinking it'd be as simple as playing with the FOCUS and SCREEN knobs on the flyback, as it really does look like the borders of the screen are out of focus, almost like a vignette effect.

The model is KV-XJ29M31.

Title: Re: Sony Trinitron - Sharp in the middle, fuzzy on the borders. How would I fix?
Post by: Sarver Systems on October 27, 2014, 11:08:52 am

degauss? Just my uneducated guess.

Title: Re: Sony Trinitron - Sharp in the middle, fuzzy on the borders. How would I fix?
Post by: yatzr on October 27, 2014, 11:21:50 am

Is it a dynamic convergence problem?  If you display a plain white crosshatch picture, are the white lines still white on the edges, or do they turn into separate red, green, and blue lines?  Or do they stay white, but just get fuzzy?

Title: Re: Sony Trinitron - Sharp in the middle, fuzzy on the borders. How would I fix?
Post by: Sarver Systems on October 27, 2014, 11:29:49 am

Hmmm, convergence. Didn't think of that

Title: Re: Sony Trinitron - Sharp in the middle, fuzzy on the borders. How would I fix?
Post by: rCadeGaming on November 14, 2014, 08:35:26 pm

Try the pots on the flyback, then convergence adjustments, but it could just be a low-quality tube or chassis.  Not all Trinitrons are made equally.  I have a bunch of KV-27FS120's, which have great picture.  I have also two KD-27FS170's, which have garbage focus in the corners, even though they use the same tubes.  No amount of tweaking at the flyback or yoke could fix it.  I even tried swapping tubes, flybacks, driver boards, and yokes, but the problem always stayed with the chassis.