Question about Hitachi 53UDX10B 53" Rear Projection Television

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Six year old 53UDX10B - Faint Horizontal Lines in Picture

Hello, My 2002 TV has been working perfectly up until yesterday when it developed faint horizontal lines across the entire picture. I would estimate 3/4 to one inch apart. Very slight but visible enough to be annoying. I would greatly appreciate any help... All the best.. Mike

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This is a pretty common fault here Mike. I cannot remember the capacitor number, but it is right off of the flyback transformer and supplies the screen voltage to the picture tube driver transistors. You will need to get a scematic and trace out and check the flyback secondary capacitors for leakage, I am sure you will have more then on or two capacitors that need to be replaced. One more thing with this TV set. Look right under where the picture tubes are on the printed circuit boards, for an indication of fluid leakage or an oily substance. If you see any evidence of this, turn off the TV set and unplug it and call out a tech to try and clean off these boards before any further damage happens. Good Luck

Posted on Jun 25, 2007

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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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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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