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Macintosh LC III and Performa 450
The Macintosh LC III (also branded as the Performa 450) was sold by Apple Computer from February 1993 to February 1994. Like all Macintoshes of its era, its original surface-mount electrolytic capacitors leak their contents and require replacing for both functionality and to protect critical traces on its circuit board from being eaten by electrolyte.
Known Issues
Maxell Battery "Bombs"
- Causes
- Apple placed a small lithium battery on the Macintosh LC III/Performa 450's Logic Board to power and preserve the contents of the Parameter RAM (PRAM). Apple used a number of different brands of battery for this purpose, one of which is Maxell. Maxell lithium batteries are notorious for rupturing in storage and spewing its highly corrosive contents all over the board.[1] If your Macintosh LC III/Performa 450 is still intact with its original PRAM battery, THE BATTERY MUST BE REMOVED IMMEDIATELY, even if it is not Maxell brand.
- Solutions
- Macintosh LC IIIs/Performa 450s with exploded PRAM batteries are pretty much irreparable, save for replacing the entire Logic Board.
Original Parts
Revision 820-0650-A Logic Board
Capacitor Specifications and Footprint Information[2]
| RefDes
|
Qty
|
Capacitance (µF)
|
Voltage (V)
|
Mount
|
Size
|
Type
|
Brand
|
| C8, C19, C20, C21, C22
|
5
|
47
|
16
|
SMD
|
|
Aluminum Electrolytic
|
Unbranded
|
| C2, C4, C5, C7, C18
|
5
|
10
|
16
|
SMD
|
|
Aluminum Electrolytic
|
Unbranded
|
| C13
|
1
|
100
|
6
|
SMD
|
|
Aluminum Electrolytic
|
Unbranded
|
References
