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SOURCE: How to change convergence ICs in Sony KP-57WS510 TV?
Replace Both STKs convergence ICs big black ics with number on them STK392-560.Parts 1-800-223-3205
SOURCE: white corners SONY KDL52XBR6
This is called a dark shading error. All the LCD consumer sets have some visible degree of this effect. Some will be a little less or more than others even from the same batch in the assembly run. This has to do with the optical design quality of how the back-plane lamps illuminate the screen. The design and assembly tollerance of this area is very critical.
Normally, LCD screens don't show their best picture in a darkened room. The very black regions of the picture content may look a little washed out. LCD screens are best watched in a room that is lit, but not very bright. You have to consider that there is a powerful set of lights behind the polarized panel of the LCD display, and there will always be some breakthrough of light.
If you want a TV that is more like a CRT in its characteristics a Plasma would have been a good choice. The trade-off with the Plasma is that it does not have the picture sharpness of the LCD. A Plasma set is best watched in a darkened room.
If you have an LCD computer monitor, take a look at it in a dark room with a black screen. You will most likely see the dark shading errors. Only the very expensive production studio type LCD monitors have less of this error than the consumer sets, and they are not absolutely perfect.
Jerry G.
SOURCE: Screen shakes / jumps vertically on my Sony KP-51HW40
The jitter is called a vertical sync problem. The problem is on the "A" board. It can be replaced or rebuilt but will be quite expensive to service.
michtech
SOURCE: Sony TV rear proj works but color is blue
Problem : Convergence Chip Failure ( common problem )
Here are some of the most common symptoms and example photos of a convergence problem
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 need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com.
They have put together a kits for most models. If you don't see a kit
for your set send them a quick note and they will put one together for
you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.
I hope this will solve your issue.
Good Luck.
If my solution proves useful please accept it.
Regards
Arjun
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