Question about Hitachi 57F500 57" Rear Projection HDTV-Ready Television

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Hitachi 57inch tv 4 years old has a black mark on the screen

The screen has a black mark looks almost like a a paint brush stroke it's 2 inches wide by 10 inches long on the bottom left hand side of the screen bottom on the mark is darker than the top. Does anyone have any suggestions on a fix or what the cost would be to fix it?

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  • jsbm1234 Jan 09, 2009

    you can see with the TV on or off & you can see the picture through it so it's not blacked out, I think it may be the screen, but what would have caused it? We haven't cleaned the screen recently and we don't use any spray cleaner just a damp cloth.

  • jsbm1234 Jan 12, 2009

    Is it possible for this to go away on it's own, since we first noticed it on Thursday 1/8 it has gotten a little bit smaller last night while watching TV 1/11 I noticed it was shorted & thinner? I haven't looked at it today to see if there was any difference.

  • Anonymous Jan 18, 2009

    i have black srips gooin to my tv . they go away then they gt bigger its very upsetting how do i fix this so i dont have to pay the eek squad a million dollars to fix this

  • Rusty Larmann
    Rusty Larmann May 11, 2010

    Sounds like it could be in the screen itself if I understand the symptom. Maybe if you describe how dark it is or weather you can see a picture on that section of the screen. If it can only be seen when the set is turned on or if it only shows up on certain backgrounds would also help.

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Thanks for your reply. The only thing that causes marks like that is usually the glue that holds the lenticular screen and the fresnal lens together heats up and drips (or slides) down. There is usually a strip of black tape that seals the two pieces of thin, glass sheets. This allows for easier installation and keeps debris from getting between screen and lens, however, someone overlooked the elements of heat and aging on this tape.The screen and lens can either be replaced or disassembled and cleaned. They are very expensive, (a few hundred dollars each), and disassembly can be very tedious. One caution I must give you is to make sure if you seperate the screen and lens make sure they go back together facing the same way. Try to clean only with warm water and a few drops of a very mild cleanser like dawn. If all else fails, you can buy a used screen sometimes from a local factory authorized service center. Occasionally they save the ones that are in decent shape. I have one 57" screen here in cincinnati that would work. Good luck, Russmann.

Posted on Jan 12, 2009

  • Rusty Larmann
    Rusty Larmann Jan 13, 2009

    From your description of the problem, I think you need to remove the screen and see if anything is hanging down inside. It's pretty simple, just get a person to help lift it off of it's hooks on each side. But first, remove the speaker grill and the row of philips screws beneath screen. Sometimes you must also remove pushbutton assembly, then lift screen up and disconnect any plug connector going to convergence sensors. You should be able to see any debris in the screen by holding it up to the light, or by looking at the tubes and mirror. Let us know if I've been any help, Russmann.

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