IMac G4 20"
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| This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables | 
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| This device is in the WorkNeeded:General category because it was flagged as missing general information about the device. The information may be incomplete, using default text, or inaccurate and should be verified with external sources if possible. If you can add or correct information on this page, please feel free to edit it and do so. | 
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iMac G4 20"
| Preliminary Information | |
|---|---|
| Release Year | 2003 |
| Leak Risk | High |
| Batteries | 3.6v PRAM Battery |
| Mounting Technology | Through Hole, SMD, BGA, Sockets |
| Capacitor Types | Aluminum Electrolytic |
| Destructive Entry | No |
Known Issues
Symptom or Problem Encountered
Causes
- Bad capacitors on the power supply
- Symptoms may be the iMac does not turn on at all or turns on once in awhile after spamming the power button.
Solutions
- Recap the power supply
Disassembly Notes
I recommend following a guide from online like iFixit. One tip is if the hard drive and dvd drives come out, unscrew the DVD drive and slide it back and they should both slide out easily.
Original Parts
iMac G4 20" Power Supply
Important Note: I did not record the capacitor locations on the power supply, I also did not replace them all, but have their values and sizes, so please confirm where each capacitor goes when you are replacing yours. So take note what value of capacitor goes where when you are removing them.
| Qty | Capacitance | Voltage | Diameter/Size | Height |
|---|---|---|---|---|
| 2 | 2700 µF | 16 | 0.5" | 1.1" |
| 1 | 1000 µF | 25 | 0.256" | 0.48" |
| 1 | 560 µF | 50 | 0.514" | 0.972" |
| 1 | 120 µF | 50 | 0.32" | 0.637" |
| 1 | 1000 µF | 16 | 0.32" | 0.755" |
Replacement Parts
iMac G4 20" Power Supply
Capacitor replacements are in the same order here as the originals above.
| Qty | Compatible Part Number | Order Links |
|---|---|---|
| 2 | EEU-FK1C272 | DigiKey Mouser |
| 1 | 25ZLS1000MEFC10X20 | DigiKey |
| 1 | 50ZLH560MEFC12.5X25 | DigiKey |
| 1 | 50ZLJ120M8X16 | DigiKey |
| 1 | 16ZLJ1000MCE10X16 | DigiKey |
If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.