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have you tried a power reset, unplug all components from the TV unplug it from the wall, then push and hold the power button for about 30 seconds, then plug all components back in, plug it into to wall then turn it on again.
I have a older 2006 SXRD rear projection TV. I had the same problem after the TV warmed up this yellow tint started in the corner and crawled its way down the TV. It turned out that Sony had a recall on the optic block of the TV. If you replaced the Lamp and adjusted the color this kinda sounds like the same problem. Here is a link explaining it. In this article it shows up as a green haze and blob, but in my TV it manifested as a yellow tint.
yes replace the lamp, sony units have certain specs that the lamp must meet to operate correctly. If the Lamp you purchased is made by LTI, these lamps do not last long as they are poorly manufactured. Look at the bulb and see who is the maker if its says LTI then replace with a Phillips brand that meets spec's for sony.
This sounds like a power board problem. It is likely that capacitors on the board are failing so they can only store enough charge to properly supply DC current to the video board for a brief time. A shop will most likely suggest that you replace the power supply board entirely. If it were my TV I would remove the board and replace the bad capacitors for a few dollars myself. Depending on your experience with electronics and soldering you may want to do the same. Otherwise having a shop replace the board makes the most sense - the labor charges to repair the old one would not be worth it.