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  Do the red LED's on the squares burn out?
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   Author  Topic: Do the red LED's on the squares burn out?  (Read 853 times)
Ismenio
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Re:Do the red LED's on the squares burn out?
« on: June 27, 2005, 06:26PM »
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Mike,

I had to play with them on some experiments and when I was fixing the Byte XD300. It’s 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 what’s 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.



These links may be somewhat helpful:

http://www.pinballnews.com/learn/leds.html (dealing with pinball machines but some good tips here)

http://marvin3m.com/gp/#display (pinball machines again but more good tips)

http://www.uashem.com/pageid-378.html (more tips, this time related a digital voltmeter)

Let us know how it goes and when you can start accepting our malfunctioning computers to be repaired!

Ismenio

PS: This is what I'm having to deal with. In this case I have a set of displays in a single board, which helps a lot:





Wikipedia entry: http://en.wikipedia.org/wiki/Seven_segment_display
« Last Edit: June 27, 2005, 06:59PM by Ismenio » Report to moderator Logged

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Mike Watters
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Re:Do the red LED's on the squares burn out?
« Reply #1 on: June 27, 2005, 02:13PM »
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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

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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Robert Weck
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Re:Do the red LED's on the squares burn out?
« Reply #2 on: June 27, 2005, 04:37AM »
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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 assume that they can be replaced individually, but I have no idea how.

Mike

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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Mike Watters
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Re:Do the red LED's on the squares burn out?
« Reply #3 on: June 25, 2005, 12:29AM »
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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
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 assume that they can be replaced individually, but I have no idea how.

Mike
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Dick Schneiders
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Re:Do the red LED's on the squares burn out?
« Reply #4 on: June 24, 2005, 08:19PM »
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Quote from: 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


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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Mike Watters
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Re:Do the red LED's on the squares burn out?
« Reply #5 on: June 24, 2005, 05:05PM »
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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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Ismenio
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Re:Do the red LED's on the squares burn out?
« Reply #6 on: June 24, 2005, 04:50PM »
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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!
Will you take pictures to share with us?

Ismenio
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Dick Schneiders
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Re:Do the red LED's on the squares burn out?
« Reply #7 on: June 24, 2005, 11:48AM »
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Quote from: 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.


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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Re:Do the red LED's on the squares burn out?
« Reply #8 on: June 24, 2005, 11:37AM »
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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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Dick Schneiders
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Re:Do the red LED's on the squares burn out?
« Reply #9 on: June 24, 2005, 05:27AM »
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Quote from: 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


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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Ismenio
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Re:Do the red LED's on the squares burn out?
« Reply #10 on: June 22, 2005, 06:15PM »
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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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Dick Schneiders
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Do the red LED's on the squares burn out?
« Reply #11 on: June 22, 2005, 04:57PM »
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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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