Question about Projection Televisions
I'm having a problem with my television, there is a blue shadow displayed by the screen, for example there is a subject on the news I can see the person in the middle, and off to the side there is a blue shadow.
After some research I read it could be convergence problems or image retention, I'm just not sure which one's the one causing the problem.
I've tried convergence reset, it didn't work.
I tried manually aligning the blue, but the crosses used to move that color around the screen until its on top of the main cross which is suppost to have all colors there to be aligned, doesn't move enough to meet up with the cross. The blue crosses just move a bit but never fall on top of the crosses its suppost to, it just stops. There is a series of crosses throughout the screen to do this adjustment individually, but the blue color doesn't seem to fall in place in any of them.
Is there another alternative could I try?
If I have to reach a tech, how expensive should I expect it to be?
This is a V-21 Chassis common, with these symptoms, for failure of the convergence amps. This set uses two STK 392-110 Sanyo amps mounted on a heat sink and hard to miss. They're a 40 pin ic about the size of a half pack of cigarettes.
It has also been my experience that two or more of the yoke return resistors need to be replaced, most commonly R8c21 and R8c22, both are 3.9 ohm 1w but test all of them for reliability.
Hope this helps!
William Rayburn, CET
PO Box 442
Long Beach, WA. 98631
Posted on May 14, 2009
If you have gone into the customer menu and CONVERGENCE is skewed and will not adjust:
One or both of the two STK-392-110 convergence chips that this set uses are bad.
The chips are about 2 1 /2 inches wide by 1 1/2 inches tall and are black in color. They are mounted on metal heat sinks with fins and are side by side--they will have the Stk-392-110 number printed on them in white letters.
If you locate them take a good look at all the light blue resistors in front of them--most are marked 2.2 ohms---look for any that are white or discolored in the middle---if you find one or more YOU HAVE FOUND YOUR PROBLEM.
BOTH chips and any bad resistors need to be replaced and the set adjusted. If you can do this repair you can save a lot of money as you can buy both chips (a pair) on Ebay for about 12 dollars plus shipping.
I have start to finish instructions for this repair on this type of set. Keep in mind, I am not allowed to post MY email address here for you.
If you cannot do this repair yourself, shop around your area--most shops charge 300-400 for this kind of repair--I do them here for 200-250 and have done hundreds of them.
If they say it has to go to the shop--keep looking as any good tech can do this repair in your home in about 1 hour.
If you have any questions or need advice reply to this posting here OR check out all my many solutions here for more information concerning what I have told you.
I am here to help people.
Regards, SD TECH
Posted on Nov 01, 2009
Testimonial: "SD TECH, THankyou for your quick and informative reply to my problem with my Panasonic PT-56TW53. "
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