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  1. #1
    AgX
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    Repairing an LCD display

    I just repaired a 12 years old telephone base station where the LCD display meanwhile turned blank completely. That display does not have pressure contacts but a plastic foil with printed conducting paths which is glued/laminated to the LCD’s base glass and the LCD’s printed circuit board. After quite some time I found out that this foil somehow lost electrical contact, though on visual inspection and mechanically it seemed totally right.

    After further experimenting I realized that applying heat of 180°C and pressure reinstalled electrical contact. I used a digitally controlled solder iron with a screwdriver type of tip.

    After quite some delicate work with a head loupe I succeeded in getting nearly all pixels work again. Only at three contacts I spoiled it as the tip used was slightly wider than the contact zone, and and at these three contacts I seemingly cut the printed conducting paths of the foil at the point where the foil runs over the edge of glass base plate. So it seems a good idea to chose a tip a little less wide than the contact zone, but not too small (no pencil tip) in order to spread pressure evenly.

    I’m curious for how long my repair will last…

  2. #2
    Ralph Javins's Avatar
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    Good morning, AgX;

    The Antex Precision soldering iron made in England has several sizes and shapes of interchangeable tips available. The smallest tip I have for mine is the 1/32 inch or 0.75 mm diameter cylindrical tip. For working around recent SOIC and other high density contacts for integrated circuits, it has been very helpful.
    Enjoy;

    Ralph Javins, Latte Land, Washington

    When they ask you; "How many Mega Pixels you got in your camera?"
    just tell them; "I use activated silver bromide crystals tor my image storage media."

  3. #3

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    I have/had an Antex soldering iron, 15W with a gold-plated needle tip (the finest one available for the iron). It's worth the money, great iron. Heats up extremely fast, nice even heat. The tip was sweet but delicate.
    I love those irons.

  4. #4
    AgX
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    too early been pleased...

    Today the display faded totally again.

    Well, that probably means that I should be more sceptical on any goods with LCD displays in future.

  5. #5

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    I don't know if this is still a live post, but here goes:
    Canon in their T80 user manual gives the life of the LCD at about 5 years, and suggests taking it to a repair depot after that time for replacement. As the T80 was one of the first cameras to have a large lcd on it, I wonder if any display of similar vintage might have time expired?

  6. #6
    AgX
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    Does that suggestion by Canon refer to the time since manufacture or the active (switched on) time? I don't know.
    Anyway, the displays of my T90 are still fine. Though, as others, I am worried.

    This case of attempted repair by me was on a telephone and not the actual LCD failed but its contacts. Though the effect is the same. And LCD's can be contacted different ways.

  7. #7
    Andrew K's Avatar
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    Canon actually put the lifespan warning into the service manuals to cover themselves against a mass of future warranty claims.

    Back in the 80's no one knew for sure how long an LCD was going to last?

    In the time I repaired cameras for Canon Australia I think I replaced 1 LCD that was faded/dim out of maybe 500 repairs involving faded LCD's...most faults involved damaged LCD's (90% of repairs) where the cameras were dropped.

    The other 10% was divided into dirty/faulty connector strips - maybe 5%. The other 5% involved a faulty circuit board where the PCB was faulty and wasn't driving the LCD correctly...
    A camera is only a black box with a hole in it....

    my blog...some film, some digital http://andrewk1965.wordpress.com/

  8. #8
    AgX
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    Great to learn that at least this problem maybe not as serious as commonly stated.

  9. #9
    benjiboy's Avatar
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    My Canon T90 was made in September 1986 and the LCD display is fine, I have three bodys and they are all fine, there must be tens of thousands of them still about like that.
    Last edited by benjiboy; 08-16-2010 at 06:52 AM. Click to view previous post history.
    Ben

  10. #10

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    Quote Originally Posted by AgX View Post
    I used a digitally controlled solder iron with a screwdriver type of tip.
    Whats a "digitally controlled solder iron"?

    Can you dial in your desired tip temperature?
    Last edited by Ray Rogers; 08-16-2010 at 08:22 AM. Click to view previous post history.

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