Resolved Replacing iMacG3 speakers suffering from foam-rot


AL1630

macrumors 6502
Apr 24, 2016
311
234
Idaho, USA
Very informative, nice to see we finally have a good way to fix these. I'll have to save it if/when this happens to the speakers on my G3.
 

philgxxd

macrumors regular
Feb 11, 2017
164
110
Malaga, Spain
The only problem I see could be the lack of that metal part on the back of the old speaker that I think is there for magnetic shielding for the CRT tube because the moving coil of the speakers can cause the image to wobble (?).
Sorry if I don't get the technical terms right.

I definitely want to try this as my iMac G3 is my first Mac ever I got as a teenager from my parents and have that same problem.
 

Recaptcha353

macrumors newbie
Nov 24, 2018
10
13
USA
Hello, all!
I just finished my own repair of my iMac G3 (DV) blueberry after watching the YouTube video above and ordering the speakers from the link in the video's description. It works great! The lack of metal shielding doesn't affect the picture at all. I placed a dab of superglue at both tabs on the speaker and placed a small rubber piece between the speaker and the screw to hold it in. It sounds just like the original and looks just like the original. It took awhile to get the speakers as they came from China (17 days exactly), but it was worth the wait.

Here's a link to the speakers on eBay (from the video):

https://www.ebay.ca/itm/2pcs-1-inch-4-4W-Full-range-Speaker-On-stage-Crystal-Bluetooth-For-HARMAN-JBL/302539025332?hash=item4670bb2bb4:g:9h8AAOSw0y1aFUNI&_sacat=0&_nkw=2pcs+1"inch+4Ohm+4W+full-range+speaker+On+stage+Crystal+Bluetooth+For+HARMAN/JBL&_from=R40&rt=nc

We finally do have a definite way of refurbishing iMac speakers!
 
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AL1630

macrumors 6502
Apr 24, 2016
311
234
Idaho, USA
The lack of metal shielding doesn't affect the picture at all. I placed a dab of superglue at both tabs on the speaker and placed a small rubber piece between the speaker and the screw to hold it in. It sounds just like the original and looks just like the original.
Awesome! I've seen a lot of complaints about foam rot over the years, good to know there's an easy cure for it now. I wonder if a similar trick would work on the Pro Speakers.
 
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Recaptcha353

macrumors newbie
Nov 24, 2018
10
13
USA
I wonder if a similar trick would work on the Pro Speakers.
I'd say so. You would just need to know how to take the pro speaker shells apart.

A few things the video didn't mention:

1. Both the original speakers and the new ones have a red dot on one of the connectors. The red (positive) wire goes on this connector.

2. Clean the old adhesive off of the speaker shells around where the front of the old speaker used to fit. If you don't the new speakers won't seal properly and it will look bad.

3. make sure the new speakers fit tightly inside the shell. The video recommended sandwiching a piece of something between the screw and the speaker to make up for the slim size of the replacement speakers. If you don't do this correctly, then the speakers WILL rattle. Use a tad of hotglue or superglue if you have to.

4. There are two types of JBL/HARMON Odyssey replacements on the market. Ones with straight speaker terminals, and those with 90 degree "elbow" speaker terminals. Don't buy the speakers with 90 degree terminals. They won't fit.

See the attached photo for more info.
 

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bobesch

macrumors 65816
Original poster
Oct 21, 2015
1,213
833
Kiel, Germany
Fixed another iMac mit rotten speakers today.
Since removing the speaker-bubbles of the iMac is a bit tricky, I wanna post pictures about how I managed to remove them and without breaking the plastic parts holding the speaker-bubble in place.
To remove the speaker-bubble I've tilted it to the side with the help of a wooden cooking spoon in order to bend the hook in middle a little bit upwards. By then moving the bubble up and down continuing tilting/pushing it then the middle hook eventually got out of its holding position.
Maybe there are more convenient ways to release the speaker-bubbles out of their place?

As a nice add-on to the shipped speakers, there was a thick layer of plastic foam which fitted nice to hold the speakers in place.

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