Question about Sharp 25R-S100 25" TV

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Horizontal blue line

Picture goes black with only horizontal blue line along middle of screen. picture will come back on by tapping on top or side of cover. is this loose connection with solder fix or does an electronic board have to be replaced? Sound not affected during picture blackouts. picture good quality when on.

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  • Anonymous Oct 13, 2008

    The screen goes black, with a think horizontal blue line in the center. The audio still works, but changing channels the channel numbers do not pop up nor does the screen change back after turning on and off. I tried taping the sides and the top of the television, but it doesn't help. Is my television dying? I've had it for over nine years.

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The intermittent horizontal line is cause by a loose solder connection in the vertical amplifier IC.
The IC is mounted on a heatsink nearby or around the flyback transformer.
The way to fix this failure is to add fresh solder where you see some brown spots on the circuitry that were cause by components getting hot.
Good Luck.

Posted on Jun 20, 2008

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Best Solution posted on Apr 12, 2008 Asker's Rating 3%20stars_w.png
dc2eb76.jpg MikeNJ1964
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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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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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