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Released in 1989 by apple computer, discontinued in 1991

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I need help with my hissing monitor

i bummed the back of the monitor and now when i turn it on it hisses but still makes the chime noise and starts up the hard drive , i really need a fix asap cause i was fixing this up for my dads b day and now its broken please help anyone .

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I agree with OldTurkey on bad caps. We used to buy complete repair kits with all the caps but those aren't available any more.

I had a 1984 128k M0001 machine sent to me last month, first with bad RAM and after that the caps failed after 5 hours. As I'm not up on this machine anymore I sent the power supply board to this guy and he did a great job on the repair with high quality parts, he is slow but does very good work, and his prices are very reasonable:

www.MacCaps.com

MACCAPS.COM 

22222 ROETHEL DRIVE

SUITE D

NOVI, MICHIGAN 48375

UNITED STATES

Charles Phillips

248 325 8812

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jarrodebdon could be bad capacitors as well as an issues with the flyback transformer. Careful with that, lots of volts on the CRT part of the Mac. You'll have to open it up and isolate the sound a bit better. Take lots of pictures and post with your question. Use this guide for that. That way we can see what you see. Great place for schematics etc can be found right here. For your own safety, here is the Apple guide for that ESD-&-CRT-Safety.pdf Remember that all capacitors will still retain a current. discharge those before messing with it.

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jarrodebdon will be eternally grateful.
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