Whenever the screen is mostly dark (like night scenes in movies or video games) the picture tends to run downward. If this were a really old TV I'd just turn the V-Hold button until it showed right. How do you fix this on my model? there's no v-hold and I've worked with all the menu options for display and picture. i set the display as bright as I could, Adjusted the screen position, done the flash focus and convergence settings. Nothing works. I'm so frustrated!!!
SOURCE: Convergence problem
you will need to replace the stk ic's they are mounted to 2 large heat sinks in side the tv. the ic numbers are on the chips themselves. i do believe it is stk392-510 for sony. once you have the number you can buy these anywhere online. just put new ones in and should be good to go. if this doesnt work then there are a few resistors and fuses by the ic's that sometimes fail.
SOURCE: Sony TV losing focus
Your TV most likely a convergence failure. ( common problem )
Here are some of the most common symptoms and example photos of a convergence problem
Here are some photos of convergence problems.
Here is a quick test....
Using your original remote go-to the tv settings then goto the convergence section.
Try to adjust the red and then the blue convergence.
You should be able to move them up, down, left, and right.
If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. 
SOLUTION
You will need to replace the convergence chips and possibly some convergence resistors and pico fuses. Its a fairly easy DIY job or you can call in a pro. If you want to do the repair yourself check the site www.TvRepairKits.com. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.
SOURCE: sony kp 57hw40 Convergence Problem The screen
If after the Flash Focus™ feature has been performed, the colors on the FLASH FOCUS screen do no line up (converge), press the
FLASH FOCUS button on the television to begin the
cycle again. If the colors on the FLASH FOCUS screen
continues to appear misaligned, service will be required .
NOTE: It is recommended to
perform the Flash Focus™ feature about thirty minutes after the television has
been turned on and keep the room as dark as possible.
SOURCE: Sony DLP has Dark Screen
Techman007 is correct here. Lamps have "lifetimes" of a certain number of hours. The lamp indicator is there to let you know that the lamp is likely to fail soon as it has reached its expected lifetime. That does not mean that there aren't lamps that will fail sooner. In your case, the lamp is not producing the amount of light required for a good picture. This is normal for lamps as they age. The light output for all lamps decreases with use. Normally this does not occur in such drastic ways however.
Since you are getting light from the lamp, the ballast is working as expected. The ballast is similar in function to the ballast for a flourescent light, it either works or doesn't.
One other thing that can be checked is the fan area and any glass surfaces for dust and dirt. Again this will effect hte overall light output, but not in such a drastic way. When you next change the lamp, carefully clen any glass surfaces as well as the fan area. Please note that any access to the lamp area should be done after the lamp has had time to cool. These lamps are burn hazards.
Dan
SOURCE: I have the Sony KDS-
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.
http://www.avsforum.com/avs-vb/showthread.php?t=1086180
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