Failure in the path for the red video channel, or failure in the screen itself. Needs process of elimination with spare boards and parts to try. Otherwise very costly diagnostics tools are required, and also the necessary test point information.
If the set is out of warranty this can be too costly to service. Get a new set.
Blue should converge on top of "yellow".Bad connection(s)
on blue convergence IC.Replace both IC's for durable repair.
Check pico fuses.Reset convergence alignment.
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