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Plain ole user
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Can you adjust it and not get it right, or does it not change? Are you in the service mode?

Edge focus on these is normally poorer than the middle if you have the middle focused. You can split the difference by focusing somewhere in between.

Why did you change the board and why do you suspect these transistors?
 

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Plain ole user
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11,121 Posts
You need to post an image of the problem. It sounds like you just are not adjusting it properly.
 

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Plain ole user
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11,121 Posts
Your problem is not defective ICs. You have either reached the limits of adjustability or you just have not adjusted the sets as well as they can be adjusted. Likely the latter. There are often geometric distortions at the edges. Some can be corrected and some cannot. They often require a great deal of time and experience to optimize. You have to become familiar with all of the options and methods that a particular set provides, as well as how controls interact and what the limits might be.
 

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Plain ole user
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11,121 Posts
Do you have a service manual? I cannot tell you what other adjustments that there might be from memory, and because you have not said what adjustments you have made.
 

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Plain ole user
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11,121 Posts
Blue horizontal linearity is off. You also need to clean your lenses and mirror.
 

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Plain ole user
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11,121 Posts
Study the explanation of convergence circuits and repairs in the sticky (first 10 posts). Study the service manual and learn what horizontal linearity does and how to adjust it. I cannot tell you from memory exactly what controls to use, as they are not intuitive and you have to follow the manual to understand the procedure.

Do not change coolant. Do not remover the lenses unless you are certain you understand which screws to use. Be very careful with the lenses and mirror.
 
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