PowerMac G4 MDD: Difference between revisions
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*Recapping the entire power supply generally fixes the problem. Although there is a chance some other components are faulty. | *Recapping the entire power supply generally fixes the problem. Although there is a chance some other components are faulty. | ||
==Disassembly Notes== | ==Disassembly Notes== | ||
Please be careful when opening the power supply because there are high voltage capacitors inside which can cause great injury to yourself. There are 5 screws holding the housing together and 4 screws holding the fans that need to be removed. Once the screws are removed, the top part of the housing needs to slide away from the fans. After that | Please be careful when opening the power supply because there are high voltage capacitors inside which can cause great injury to yourself. There are 5 screws holding the housing together and 4 screws holding the fans that need to be removed. Once the screws are removed, the top part of the housing needs to slide away from the fans. After that, the fans can be disconnected from the fan control board (though they may be zip tied to adjacent cables). | ||
There are four screws around the perimeter of the main board, after those are removed the board should be mostly free, though you may get hung up on a filter cap that's behind the AC input. This cap is only adhered to the board, not soldered to anything, so it can be broken free of the main board without having to worry about desoldering anything. At this point the board should finally be free enough to slide it out and flip it over to desolder the two wires going to the AC input, take note of the orientation for reassembly. | |||
The fan controller board has capacitors on it that may need to be replaced (this is where C401/C402/C403/C405/C407 are located). Even if they don't, it is recommended that this board be desoldered and moved out of the way to allow easier access to the capacitors behind and around it, as these do need to be replaced. The fan controller board is held in with both solder and a decent amount of adhesive, it may prove difficult to get it free of the main board even once the solder and most of the adhesive has been removed. | |||
==Original Parts== | ==Original Parts== | ||
=== | ===AcBel API1PC36=== | ||
''This recapping guide is only for the | ''This recapping guide is only for the AcBel 360w and 400w API1PC36 Rev. B power supply units. There are Samsung power supplies also for the MDD which this guide does not cover.'' | ||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
|+Capacitor [[Capacitor Specifications|Specifications]] | |+Capacitor [[Capacitor Specifications|Specifications]] | ||
Revision as of 22:37, 25 March 2024
- For more information, see this article's corresponding Wikipedia page: https://en.wikipedia.org/wiki/Power_Mac_G4#3rd_generation:_Mirrored_Drive_Doors/FireWire_800.
| 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 | 
|
The G4 MDD is the third and final generation of Apple's Power Mac G4s, named so due to its Mirrored Drive Doors. It was produced from 2002 to 2004, and is notable for being one of the last Macs capable of running Mac OS 9 (with some caveats).
| Preliminary Information | |
|---|---|
| Release Year | 2002 |
| Leak Risk | High |
| Batteries | One (1) PRAM Battery |
| Mounting Technology | Through Hole, SMD, BGA, Sockets |
| Capacitor Types | Aluminum Electrolytic |
| Destructive Entry | No |
Known Issues
Symptom or Problem Encountered
Causes
- Power Supply is Faulty with bad capacitors.
- When you try to power up your MDD, you will typically get a quick power light and fan spin and it will shut off.
Solutions
- Recapping the entire power supply generally fixes the problem. Although there is a chance some other components are faulty.
Disassembly Notes
Please be careful when opening the power supply because there are high voltage capacitors inside which can cause great injury to yourself. There are 5 screws holding the housing together and 4 screws holding the fans that need to be removed. Once the screws are removed, the top part of the housing needs to slide away from the fans. After that, the fans can be disconnected from the fan control board (though they may be zip tied to adjacent cables).
There are four screws around the perimeter of the main board, after those are removed the board should be mostly free, though you may get hung up on a filter cap that's behind the AC input. This cap is only adhered to the board, not soldered to anything, so it can be broken free of the main board without having to worry about desoldering anything. At this point the board should finally be free enough to slide it out and flip it over to desolder the two wires going to the AC input, take note of the orientation for reassembly.
The fan controller board has capacitors on it that may need to be replaced (this is where C401/C402/C403/C405/C407 are located). Even if they don't, it is recommended that this board be desoldered and moved out of the way to allow easier access to the capacitors behind and around it, as these do need to be replaced. The fan controller board is held in with both solder and a decent amount of adhesive, it may prove difficult to get it free of the main board even once the solder and most of the adhesive has been removed.
Original Parts
AcBel API1PC36
This recapping guide is only for the AcBel 360w and 400w API1PC36 Rev. B power supply units. There are Samsung power supplies also for the MDD which this guide does not cover.
| Part Number on Board | Capacitance | Voltage | Diameter/Size | Height | Type |
|---|---|---|---|---|---|
| C3, C4, C5 | 100 µF | 450 | 0.7" | 1.6" | Radial |
| C7 | 220 µF | 35 | 0.3" | 0.64" | Radial |
| C8, C32, C401 | 47 µF | 25 | 0.18" | 0.46" | Radial |
| C10 | 2200 µF | 16 | 0.4" | 1.2" | Radial |
| C13 | 2700 µF | 6.3 | 0.4" | 1.1" | Radial |
| C16, C29 | 2200 µF | 6.3 | 0.4" | 0.9" | Radial |
| C21 | 3300 µF | 10 | 0.4" | 1.2" | Radial |
| C30, C55, C56, C402 | 0.47 µF | 50 | 0.2" | 0.45" | Radial |
| C35 | 470 µF | 35 | 0.4" | 0.8" | Raidal |
| C41 | 680 µF | 35 | 0.4" | 1.2" | Radial |
| C43 | 100 µF | 25v | 0.25" | 0.45" | Radial |
| C53, C57 | 4.7 µF | 50 | 0.2" | 0.45" | Radial |
| C59, C60 | 1000 µF | 10 | 0.325" | 0.76" | Radial |
| C403, C405, C407, C45 | 10 µF | 50 | 0.2" | 0.45" | Radial |
| C416 | 470 µF | 16 | 0.32" | 0.6" | Radial |
Replacement Parts
ACBel API1PC36
| Part Number on Board | Qty | Compatible Part Number | Order Links |
|---|---|---|---|
| C3, C4, C5 | 3 | 450HXW100MEFR18X25 | DigiKey Mouser |
| C7 | 1 | 35YXJ220MCA8X11.5 | DigiKey Mouser |
| C8, C32, C401 | 3 | 10PX1000MEFC8X11.5 | DigiKey Mouser |
| C10 | 1 | 16ZLS2200MEFC10X25 | DigiKey Mouser |
| C13 | 1 | UHW0J272MPD | DigiKey Mouser |
| C16, C29 | 2 | 6.3ZLH2200MEFC10X20 | DigiKey Mouser |
| C21 | 1 | 10ZLS3300MEFC12.5X20 | DigiKey Mouser |
| C30, C55, C56, C402 | 4 | UPS1HR47MDD1TD | DigiKey Mouser |
| C35 | 1 | 35ZLH470MEFC(T8)10X16 | DigiKey Mouser |
| C41 | 1 | 35ZLH680MEFC10X23 | DigiKey Mouser |
| C43 | 1 | 25YXG100MEFC6.3X11 | DigiKey Mouser |
| C53, C57 | 2 | UPW1H4R7MDD | DigiKey Mouser |
| C59, C60 | 2 | 10ZLS1000MEFC8X16 | DigiKey Mouser |
| C403, C405, C407, C45 | 3 | 50YXF10MEFC(T1)5X11 | DigiKey Mouser |
| C416 | 1 | 16ZLK470M8X16 | DigiKey Mouser |
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. Replacement capacitors can be found on both digikey and mouser, or pick your preferred source.