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The problem is in the picture tube board circuit. Sometimes the CRT socket doesnt connect well to the CRT pins. Or maybe there have bad solders from RGB transistors. check those transistors, Also the bad thermistor discolored the entire tv screen.
Find the vertical IC and check for very small cracks on the solder joints of its pins and resolder (approx. 10 Pins). Also check in the same area for a 1 micro farad at 50 vdc capacitor that goes bad and replace it.
Try lowering the brightness and contrast. Sounds like you are overdriving the picture tube. Green gun in picture tube may have a shorting element; if so no fix for that other than pic tube replacement.
Isolate filament voltage from CRT,i.e. unplug
Crt socket from pix tube.Measure filament voltage on CRT PCB.If present,suspect bad pix tube.If missing,solder any/all connects in
filament circuit,meaning CRT board first then
the picture tube on your TV set is exausted. Please contact your nearest Authorized Sony Service for further help/advice.
After all, Sony is a good choice. The next TV set you buy could be one of Sony-s Bravia LCD.
It seems your set has a loose conection in the high voltage circuits,in fact by now it should have many loose conections in different areas like the power supply and the horizontal deflection circuits,if you are familiar with tv service you can use the information as the first step to take,some of the loose conections are hard to see even for the trained technician but the one giving you this problem should not be hard to see,if you are not too familiar with tv service be safe and call for assistance from a servicer a least for an estimate.