Question about Sony KP-43HT20 43" Rear Projection HDTV-Ready Television
Your convergence board has failed.
This is very very common in older projection TVs like yours - maybe the #1 problem.
The TV has three color tubes in the lower half of the cabinet that project an image off the main mirror and onto the back of the screen. The convergence board processes the signals to the tubes and adjusts the light beams so that the red, blue and green images all line up at the point where they hit the back of the screen. When the board fails, the light beams don't line up and you get the '3D' image with the separated colors and bowing near the edges.
The board has two main components called convergence amplifiers (some call them STKs or convergence ICs). They can fail. It is also common for some pico fuses or fusible resistors on the board to pop. If all three colors are off, then the STKs are probably bad. If only one color is off, then it could just be a pico fuse.
Some people have fixed the board themselves but it is not a job for a beginner. The parts are only about $60 but you need to know what you are doing. I can point you in the right direction and give you part numbers etc. but you need to have a good understanding of soldering and troubleshooting basic electronic components etc
A guide on how to fix this problem :-
To have it repaired will cost you about $300-$400.
I'm sorry it isn't the best news.
Let me know,if needed further assistance.
Hope i helped you.
Thanks for using ' Fixya ' and have a nice day!!
Posted on Oct 01, 2010
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Posted on Jan 02, 2017
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