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Print Page Chess Computer Community
    General Category => Discussions about Chess Computers => Message started by: Dick Schneiders on June 22, 2005, 04:57PM
	

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Title: Do the red LED's on the squares burn out?
Post by: Dick Schneiders on June 22, 2005, 04:57PM

One of the little red LED's on a square of my recently acquired Fidelity Elite Avant Garde isn't lighting up. Do these things burn out, or is this some loose connection? Is it difficult to replace/repair these little lights?

Thanks,

Dick Schneiders


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Title: Re:Do the red LED's on the squares burn out?
Post by: Ismenio on June 22, 2005, 06:15PM

Dick, to be picky, LEDs don't burn out like light bulbs as they don't have filaments, but like any other electronic component they can get damaged. Whether it needs replaced or a wire just re-soldered, the operation should be pretty straighforward. I think you may even be able to find a suitable replacement at your local Radio Shack.

Let me know if you need help with that. And congratulations again!

Ismenio


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Title: Re:Do the red LED's on the squares burn out?
Post by: Dick Schneiders on June 24, 2005, 05:27AM

[quote author=Ismenio link=board=1;threadid=325;start=0#msg2607 date=1119489335]
Dick, to be picky, LEDs don't burn out like light bulbs as they don't have filaments, but like any other electronic component they can get damaged. Whether it needs replaced or a wire just re-soldered, the operation should be pretty straighforward. I think you may even be able to find a suitable replacement at your local Radio Shack.

Let me know if you need help with that. And congratulations again!

Ismenio
[/quote]

Ismenio,

I looked at the Radio Shack on-line catalog and there are several choices as to LED's. How are the sizes determined? They show them as 3mm, 5mm, 10mm, etc. Is this the width (or diameter) of the LED at the base? Does there need to be any consideration as to the rating of the LED as to current load?

Thanks,

Dick Schneiders


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Title: Re:Do the red LED's on the squares burn out?
Post by: mychess on June 24, 2005, 11:37AM

Hi,

Are you sure about the LED ?
They have a good fiability (far better than two soldering).
Can you push-pull it when it must lightning to test the soldering ?
For the size, it's the daimeter, but desoldering the bad led before, and you have a model.

Cordialy.


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Title: Re:Do the red LED's on the squares burn out?
Post by: Dick Schneiders on June 24, 2005, 11:48AM

[quote author=mychess link=board=1;threadid=325;start=0#msg2632 date=1119638273]
Hi,

Are you sure about the LED ?
They have a good fiability (far better than two soldering).
Can you push-pull it when it must lightning to test the soldering ?
For the size, it's the daimeter, but desoldering the bad led before, and you have a model.

Cordialy.
[/quote]

I will open up the computer case and check it out. I did push on the non-working LED a little bit, and nothing happened. Hopefully when it is exposed more, I can see what is going on.

Thanks much for the help and answers.

Dick Schneiders


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Title: Re:Do the red LED's on the squares burn out?
Post by: Ismenio on June 24, 2005, 04:50PM

Dick,

I would do exactly what Olivier (mychess) suggested. Once you have it open you should be able to get the exact dimensions for the LED.
Soon we will all be repairing our own computers! :D
Will you take pictures to share with us? 8)

Ismenio


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Title: Re:Do the red LED's on the squares burn out?
Post by: Mike Watters on June 24, 2005, 05:05PM

This is a good thread. I am listening and learning. Letting you guys do all the hard work. :)

When Dick has mended this one I shall start a thread to get help mending LED display segment failures. But don't let me interrupt.

Mike


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Title: Re:Do the red LED's on the squares burn out?
Post by: Dick Schneiders on June 24, 2005, 08:19PM

[quote author=Mike Watters link=board=1;threadid=325;start=0#msg2644 date=1119657903]
This is a good thread. I am listening and learning. Letting you guys do all the hard work. :)

When Dick has mended this one I shall start a thread to get help mending LED display segment failures. But don't let me interrupt.

Mike
[/quote]

Mike,

I certainly am learning all this stuff as we go, and don't know much about it, as is obvious. Is there really such a thing as a LED display? I had always considered them to be LCD's.

Ismenio,

Yes, I will try and take some pictures once I get into these computers. The Conchess won't take much bravery since it doesn't work, but the Fidelity Elite Avant Garde works perfectly, so I am a bit nervous about opening it up just to replace a single LED.

Once I start doing this, hopefully I will become as comfortable at this as you seem to be. ;)

Dick Schneiders


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Title: Re:Do the red LED's on the squares burn out?
Post by: Mike Watters on June 25, 2005, 12:29AM

[quote]Mike,

I certainly am learning all this stuff as we go, and don't know much about it, as is obvious. Is there really such a thing as a LED display? I had always considered them to be LCD's.


Dick Schneiders
[/quote]Dick

Here I go interrupting. :-[

I don't know much, but I do know a LED is a Light Emitting Diode, and those are also used in the displays in the old chess computers like the CC1 with the red segments to make up the letters and numbers. And a LCD is a Liquid Crystal Display, a more advanced technology that I think draws less current etc.

As the individual segments in LED displays can fail and the rest work perfectly I (oops!)ume that they can be replaced individually, but I have no idea how.

Mike


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Title: Re:Do the red LED's on the squares burn out?
Post by: Robert Weck on June 27, 2005, 04:37AM

Hi Mike,
[quote]
I don't know much, but I do know a LED is a Light Emitting Diode, and those are also used in the displays in the old chess computers like the CC1 with the red segments to make up the letters and numbers. And a LCD is a Liquid Crystal Display, a more advanced technology that I think draws less current etc.

As the individual segments in LED displays can fail and the rest work perfectly I (oops!)ume that they can be replaced individually, but I have no idea how.

Mike
[/quote]
All the (in the most cases!) seven segments of a LED display are together in one unit. You can't replace a single segment...


best regards,
Robert


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Title: Re:Do the red LED's on the squares burn out?
Post by: Mike Watters on June 27, 2005, 02:13PM

[quote]All the (in the most cases!) seven segments of a LED display are together in one unit. You can't replace a single segment...


best regards,
Robert

[/quote]Robert

Thanks for that information. I shall look out for them in my local electronics store.

Has anyone changed an Led Display?

Mike


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Title: Re:Do the red LED's on the squares burn out?
Post by: Ismenio on June 27, 2005, 06:26PM

Mike,

I had to play with them on some experiments and when I was fixing the Byte XD300. Itís not all that hard but you need patient and good tools. Make sure you use a light soldering iron and be careful not to let it touch the little pins more than whatís necessary for the soldering process. It helps a lot to have some support to hold the circuit board so that it stays firm in place and you can have both hands to work with.



Wikipedia entry: http://en.wikipedia.org/wiki/Seven_segment_display



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