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I have a Hitachi Ultravision projection TV model # 46uxtb built in August 1991 Serial # wlh003111. The picture is very dark and to be able to see it I have to turn up the contrast and brightness so much the pirture is distorted and filled with ghosts. I was told by one website that the projection bulb is bad to replace it. I called a local vendor for the part and He said that this tv do not have a projection bulb (it is too old for a bulb) and it's most likely a power supply problem or a bad circuit board or bad connections on the circuit board. He guessed 400 or 500 dollars to fix it. Does this have a projection bulb?? I've looked in your library for simial problems but could find none. Thanks

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  • michaella872 Feb 02, 2010

    Hi



    I can take a picture of the screen I'll set the brightness and contrast to the mid point and show you what that looks like.



    I purchased this tv used about 4 years ago, at 1st it was looked good but over the next 2 years it started to go dark. I have never cleaned anything & I doubt if the past owner had cleaned it because he had it built into a cabinet on a wall.



    Thanks for the suggestion I'll take a before and after photo and send them to you. Do you have any directions or instruction/ pictures of the disassemebly of this unit??



    Thanks again.



    Michael Latine

  • michaella872 Feb 02, 2010

    Hi



    I checked this number last night if it is not 46UX7B then it can only be 46VX78 I can not tell if the U is a V ...... and if the B is an 8 .... but the other numbers are correct.



    Thanks

  • michaella872 Feb 02, 2010

    Hi



    Can you scan it to email as a pdf and I can print it out??



    Thanks



    Michael Latine

  • michaella872 Feb 02, 2010

    I would have thought you could do it thru this connection but here it is



    michaellatine@howardhanna.com



    Thanks

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Your unit has 3 crts. Red,Green & Blue. I'm amazed that a unit made in 1991 is still functioning but if the only problem is that it is dark you can probably fix it by turning up the screen drive for each gun. Over time the parameters of the tubes change and they need to be adjusted. This will require some knowledge of the relationship of the dynamics of the system. It will also require doing the adjustment with the set operating and exposure to voltages which are lethal. It would probably be better to let a qualified tech adjust it. The shop you spoke to obviously does not know what they are talking about. Find a shop which has experience with older units and understands the relationship of screen drive, picture adjustment and brightness.This is a simple fix and shouldn't take more than 1 hour by a professional. I would guess less than $100. At the same time have them clean the lenses and mirror and if necessary touch up the convergence. It still should not cost more than $100 from a reputable shop. Let me know how this works out and if you need any more help.

hardrocko

Posted on Feb 03, 2010

  • Kim Yearick
    Kim Yearick Feb 08, 2010

    As I stated your unit does not have a lamp. The age of the unit would lead me to believe the crts are going bad. Obviously not worth replacing. I really think someone should try turning the screen drives up a little. It could at least partly solve your problem and make the unit viewable. With the age of the unit it certainly can't have much time left. Let me know how you make out.



    hardrocko

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First: I know quite a lot about these sets as I have repaired them for years; I own a 60 inch also made in 1991. As far as the picture being dark that could be caused by the lens on the 3 picture tubes inside the set being dusty if they have not been cleaned for several years---there is also a mirror inside.

You can post a photo of what the picture looks like here if you are willing. The other problem these sets at this age is they used 3 smaller boards that have what are called surface mounted caps that dry out with age--one is for PIP, one for Signal, and one for convergence memory. If one of those is bad--no longer available and very expensive to repair.

Most of these 1991 sets have two rectangular plastic pieces that you remove left to right just under the screen on front; then there is a grill below that has to be removed and a few more screws and the entire screen and frame come off to clean the lens and mirror. Most of these sets you can also get at the lens from the rear if you remove the back cover of the set--clean them with a lens cloth or paper towel with glass cleaner sprayed on the towel.

Let me know if the lens and or mirror have or have not been cleaned for a long while. If possible try to take a photo of what the picture looks like and you can post it here--If you need to know how let me know.

Let me know what questions if any you have--I am here to help.

SD TECH

Posted on Feb 02, 2010

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  • SD Tech
    SD Tech Feb 02, 2010

    Yes, in fact I should have the entire service manual for this set on CD---I have a CD with over 150 manuals for these sets--double check model number to confirm actual model--I have not checked but the one listed may be incorrect at the last few letters.

    SD TECH


  • SD Tech
    SD Tech Feb 02, 2010

    I have the basic service manual for it with exploded views etc.

    It is over 20 pages and too long to post except by email.

    Let me know if you need more help.

    SD TECH



  • SD Tech
    SD Tech Feb 02, 2010

    Yes, it is in PDF from Hitachi. I am not ALLOWED to ask for a email address.........




    SD TECH


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