Question about Sony KP-51WS510 51" Rear Projection HDTV-Ready Television

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Blurry and some purple and green curved lines when borders are on the screen. text and borders curve also on the top and bottom of the screen.

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Posted on Jan 02, 2017

  • 1694 Answers

SOURCE: Blurry Curved Picture

Convergence IC's need to be replaced...change them both..
part # STK392-560.....Check soldered-in fuses...........T.

Posted on Dec 26, 2007

  • 1113 Answers

SOURCE: Sony 61 projection - kp61hs10

WARNING! If you don't have any electronic experience this is not for you, Perform this procedure totally at your own risk. High Voltages exist in your tv and on the boards I am going to talk about, and can have high voltages on them even after the tv is unplugged

This sounds like the convergence circuit going bad

I would highly recommend you get a service manual for your set, if you don't have one already. You can download one from ( .

While you are reairing clean the refelective mirror inside you TV. You have to open back cover and than top cover to clean mirror and also dont forget to clean CRT lenses ,they are mounted facing upward ,you may find a lot of dust sitting on CRT lens, clean the 3 of them ie r.g.b..

What has normally happened is that the convergence output driver ic's either one or both of them has shorted. Causing your picture to be un-converged, The Symptom of your failure can take on many different looks, so one explanation of what the failure looks like will not be adequate. It will be basically one or more (red,Green,Blue) crt's are not aligned correctly, and colored shifted, and distorted picture of some kind will be seen. Auto focus will not fixit and may even make it worse. When these ic's short, they can cause one or more pico fuse to blow. Allot of people ignore this part of the repair and get themselves into trouble. Please listen to my warning, and make sure you check these fuses!
About the boards:
The two boards we will be working with are the "D" and "G" boards. They will have a big "D" or "G" stamped into them. On most models the "D" board will be to the center left of you when looking from the back. The "G" board will usually be to the left of the "D" board and standing vertically. When removing the board make a mental note of where all the plugs go. The Flyback (the big gray transformer near the back) has a fat red wire coming out of it. To remove this wire push down and twist on the distribution block side. Don't try to remove it from the flyback side, you can damage the flyback. There is a focus wire going upto the focus block as well, pull the wire straight out of the focus block side. But if you have enough room to work behind your television you can leave the red and focus wires in the tv, just flip the board over at the television after removal.
The Parts:
The parts you will need are two ic's that are referred to as STK ic's. This is in reference to the first three letters of the part number. You will also need some pico fuses. The pico fuses are little yellow fuses that look like resistors. When they blow, they will show no physical sign of failure. The amperage rating will be printed on the fuse. For example a 5 amp fuse will have the number 5000 on it. A 3.15 amp fuse will have the number 3150 on it. You will need to use an ohm meter to test these fuses.picofuse.jpg f0f219158e118e83-15a6913-11600c8211a-44d2-803275887.jpgf0f219158e118e83-15a6913-11600c8211a-44d2-803275887.jpg
If your set uses either STK392-110, or STK392-120, you should replace them with a higher wattage part; either the STK392-150 or STK392-180. Since this is a very prolific problem, there are allot of companies that make cheap bad ic's that can be purchased usually for around $6.00 - These replacement ic's are BAD, they will FAIL on you again. I have had allot of experience with this problem, please listen to my warning! Only get a set that is from a reputable manufacturer. If your ic part number is something other than the ones I mentioned above, ONLY use the EXACT same part number for replacement. The part number is boldly printed on the part.

After you take out the bad convergence IC's YOU MUST apply a generous amount of heat sink compound on the backs of the new IC's. Failure to do so will lead to premature breakdown of the convergence IC's due to excessive heat not being dissipated away from the iC's.
The Location of the parts;
The stk ic's are on the "D" board, attached to large heat sinks, When looking from the back you can see the heat sinks but the part's themselves will be pointing away from you and hard to see without removing the board, or using a mirror to look at the part numbers. The fuses are generally located under the fins of the heat sinks. There are several of them and vary by model. On the "G" board there will be two yellow pico fuses near the connector going to "D" board. These fuses provide power to the stk ic's you must check these as well.
The Repair:
When replacing the STKs make sure you use heat sink compound on the back of the ic's before installing them. Also as a rule of thumb, screw or clamp the ic's down to their heat sinks before you solder the pins. Replace any blown pico fuses and re- install your boards. When you turn your set on it may still be out of convergence due to many factors. Try pressing the auto focus button on front of your set. If this does not work, you will need to do a convergence. Please see my article "Sony Convergence Procedure" to complete this part.
Possible Problems after the repair;
Many things can happen during your repair, the most common problem and one that even I - an experienced tech still have problems with are not plugging in all the wires. This will cause various strange problems. So if the set acts differently than It did before. First suspect that you have missed a wire. Don't assume that you got all the wires in. it is extremely easy to miss one. I have had people and techs tell me "I am sure I plugged in all the wires" but when I investigate a little further we find that wire that was hidden behind something else and once we plug it, all will be well. Another issue you need to be aware of is if you are in convergence mode and you cannot move one of the colors in either vertical or horizontal directions. Re-check you pico fuses and solder. 99% of these problems are due to either shorted pins or a missed pico fuse.

more info link

STK ic pic

59efbae.jpg 4e54d15.jpg PICO's

Posted on Dec 28, 2007

  • 398 Answers

SOURCE: Curved blue lines on screen.

You have a completely different problem. The screen voltage for the blue picture tube is slightly too high on your set. This will put fine lines in the background of the picture, called retrace lines. This is very common and easy to correct. Remove the front speaker cover and the access panel behind it. Look inside and you will see a black box with six controls, each control having a little white glue on it. This is the Focus/Screen block. Three controls are labeled Focus and three are labeled Screen. The screen control in the center is for green but I am not sure if the screen control on the left or right is for blue for your model. With the TV on, set it to VIDEO 1 but do not connect anything to the VIDEO 1 jacks. This will produce a pure dark picture, showing any faint lines in the background. Choose one of the screen controls and increase (turn clockwise) it slightly. If the blue lines do not get brighter it means you are turning the red screen control, so put it back where it was and choose the other screen control. When you find the blue screen control, decrease (turn counter-clockwise) it until just when the blue lines are gone. If you want you can check that the red and green screen controls are set to just below the point where their faint lines are visible. When done, replace the panels and your picture will be back to perfect.

Posted on Apr 12, 2008

  • 3459 Answers

SOURCE: KP-53HS30 My picture is curved

Your TV most likely a convergence failure. ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
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.


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 Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.

Posted on Jun 19, 2009

SD Tech
  • 14553 Answers

SOURCE: double image shows in red

it is quite fixable and usually in your home; it is called convergence--kp57wv500 uses two STK 392-560 convergence Ic chips; both and any bad fuses or resistors around them need to be replaced and the set adjusted after.

I fix a lot of these sets in my area---if you call a shop you will pay 300-400----a lot of independent people will do it for under 250 in your home--shop around--now is the slow time of the year for tv shops---you could buy both IC chips on ebay for less then 13 dollars plus shipping---this is a normal problem in all projection tv sets--the chips have a white grease on the back of them designed to transfer heat--after several years it drys out and one of them goes bad---repair should take about an hour or so in your home---you should ask yourself if 200-300 dollar repair is worth while, could you replace the set for this? If the chips are replaced and the set adjusted they should be good for 4 or 5 years at the least.

I do this here for free so if this has been helpful give me a vote here. If you have questions or need more help here is my email:

Posted on Aug 19, 2009

Testimonial: "Thanks for the detailed advice. Will look into it repair, but plasmas look so nice these days!"

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