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SET uses a optical light engine--lamp which is quite hot shines into the engine---blue is first to get the light and heat and is usually first area in the lens and baffles to get damaged(loss of blue leaves red and green which equal a yellow screen.
From your description. It sounds klike you have some bad glycol or fluid in one or more of the picture tubes. to repair this the glycol can be replaced. To do this is a complicated proceure that requires the tubes to be removed. one the glycol is replace it has to be aligned something that not all that easy At our shop this repair would averge 375 to repair
Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from www.TvRepairKits.comand do the repair yourself. Its a fairly easy DIY fix. Here is an example video
You-Tube video "9oI1Nzq7CR8" placeholder (do not delete)
yellow tinting is a indication of browning or alge growing in what is known as crt fluid also know as glycol. although this can occur in any of the three tubes blue is your most likely tube. dirty gylcol can be changed. but is a involved repair. you have to remove the tube. remove glycol disassembel tube clean thoughly with denatured alchol. reassemble fill with clean fluid ..replace tube then align and reconverge. as a tech aournd a 2 hour job
the dirty glycol can also cause the perfect focus to fail as the sensors cant "see" through the fluid. this is a very common problem on these units