Question about Projection Televisions
There is some sort of magnetic pull, distorting the color of the t.v to pink and green. we have moved everything away from the t.v yet the color will not return completly. Is there anything we can do to restore a full normal screen?
It is problem of failure of convergence ICs or related circuit. Please confirm model number of your TV that is Sony KP-57WS500 to help you out.
It would be nice if you could past TV snap shot here for easy understanding.
Posted on Oct 03, 2008
Your TV most likely has one of two possible problems.
Problem #1: 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.
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.
Problem #2 CRT Fluid is Cloudy
Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.
Picture of a set that needs the fluid changed.
TV set after fluid change
What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.
Posted on Feb 22, 2009
This can be repaired by a Degaussing coil from most TV repair places. If you haven't already you should shut down the TV and wait till it cools maybe 1 hour or so and then when you turn it on there should be a degaussing circut that might clear this up for you build into the set. Its not that strong a signal and usually takes care of minor discolorations. If it doesn't have that then a shop can come and take care of it pretty fast usually.
Posted on Mar 29, 2009
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