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Sony kp41s3u - blue screen

Switched it on and got an all blue screen one day (red and green are there but flash)
popped the back cover off and you can see the red and the green tubes flashing really fast, but the blue just sits there bright with no flashing.
Any ideas?

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  • FunkedUp Feb 26, 2008

    I dont have any distortion on picture, its just blue.

    I cant see any menus even if i did get them to come up. The menu on sonys are all green and the green tube is flashing really fast.

  • FunkedUp Feb 26, 2008

    I've tried unplugging things from the blue tube and then the blue doesnt start up at all but it does stop the others flashing. They are still dim though.

  • FunkedUp Feb 26, 2008

    I fixed it.

    turns out it was a bad connection on the box with the adjustable focus for each colour.

    No soldering or parts required!!!!!!

  • FunkedUp Mar 20, 2008

    ok the problem came back. Its not a loose connection on focus block but i can still cure it temporarily by swapping 2 colours on the back of the focus block.



    Any ideas whats causing this???

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  • 4,402 Answers

Convergence amp ic bad or loose connection on ic's

http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/


Posted on Feb 26, 2008

  • Cary Farah
    Cary Farah Feb 26, 2008

    that would be the focus block. good job
    please post this as fixya!

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Best Solution posted on Apr 12, 2008 Asker's Rating 3%20stars_w.png
dc2eb76.jpg MikeNJ1964
Rank:guru_s.gif Guru sony.gifSony Expert
Rating: 89%, 674 votes
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.
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noavatar_s.gif gator149
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MikeNJ1964 was exactly right! I have a Sony KP-65WV600 that had horizontal green lines that showed when the picture was darker. I had to remove 3 screws on the right and left side of the tv holding in the speakers...carefully pop out the middle panel from the clips holding it in....remove 4 screws from the cardboard in the middle and remove the cardboard. I then saw the six screws. The adjustment screws were the three below. I turned the middle screw until the lines dissapeared. I tried the left screw and blue lines appeared which I then adjusted away.
THANKS a bunch. SAVED me money!!!

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