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| Author | Suggestions/Advice... (Read 9034 times) | ||||||||||
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OrganistAnthony
4 MB  Posts: 4 
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on: January 18, 2011, 19:02
I have a Power Macintosh 5500/250, that I love dearly. However, I'm pretty sure the built in monitor won't last much longer as it has a high pitched squeel on all of the resolutions I find acceptable to use, and just recently a bit of screen jiggle on certain resolutions when the computer is first turned on. I've looked around on ebay and the web for replacement cases, thinking I could always use my motherboard and hard drive with a "shell" of another 5xxx series computer with a good working monitor, or even an LC 5xx series computer. I honestly haven't seen any of these AIO macs anywhere on the web under $200, and I've not seen a single one of these AIO macs on ebay. I thought this would be a really easy computer to find, and that everyone would want to get rid of them. I called around and there were a couple of computer stores that would be willing to take a look at it, but I'm afraid it might be more trouble and expense than what it's worth. I'm willing and open to listen to any suggestions other System 7 Today users might have! -Anthony |
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wove
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1024 MB Posts: 1363
Reply #1 on: January 19, 2011, 07:09
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The PM 5500 is indeed a very fine machine. I am a big fan of the all in one design. The parts motherboards, monitors etc are for the most part interchangeable between any of the 5xxx machines. Putting the MB from a 5500 into a 5400 turns the 5400 into a 5500. High pitch squeal from the monitor comes from either the flyback transformer or the yoke. They always vibrate at a high pitch, it is the nature of the design for all CRTs. Over time the vibration breaks down the varnish coating which then allows the individual strands of wire to move. Not really different than a violin string. The yoke is the coils that go around the back of the tube, if they are the source of the noise, there is not much you can do beyond replace them. The flyback transformer is big and not attached directly to the tube. If it is the source of the noise you can generally fix it by very thoroughly soaking it and coating it with fresh varnish. Although generally very annoying CRTs can operate for years making the squealing. Eventually the vibration causes wear on the varnish insulation and the coils will begin shorting out. That is not really harmful either, but it changes the electrical properties and cause distortions in the picture. I would suggest you continue limping it along until you find a good deal on a unit without a squeal. bill
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OrganistAnthony
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4 MB Posts: 4
Reply #2 on: January 26, 2011, 21:13
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Thanks so much for the information, Bill! I'll keep looking and feel a little better knowing that is won't go "boom". I also noticed on one of the "better" resolutions, the monitor gets louder when more white is being displayed on the screen.
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