Macintosh Performa 550: Difference between revisions
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The '''Macintosh Performa 550''' (also branded as the '''Macintosh LC 550''' and '''Macintosh Performa 560 Money Edition'''<ref>[https://web.archive.org/web/20171201041206/https://www.thefreelibrary.com/MONEY+AND+APPLE+TEAM+UP+TO+OFFER+MULTIMEDIA+PERSONAL-FINANCE+COMPUTER+...-a014712650 Money And Apple Team Up To Offer Multimedia Personal-Finance Computer System] (Press Release). January 17, 1994</ref>) was sold from October 1993 until March 1995. The logic board is essentially the same one used in the '''Macintosh Color Classic II'''. 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. | The '''Macintosh Performa 550''' (also branded as the '''Macintosh LC 550''' and '''Macintosh Performa 560 Money Edition'''<ref>[https://web.archive.org/web/20171201041206/https://www.thefreelibrary.com/MONEY+AND+APPLE+TEAM+UP+TO+OFFER+MULTIMEDIA+PERSONAL-FINANCE+COMPUTER+...-a014712650 Money And Apple Team Up To Offer Multimedia Personal-Finance Computer System] (Press Release). January 17, 1994</ref>) was sold from October 1993 until March 1995. The logic board is essentially the same one used in the '''Macintosh Color Classic II'''. 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 == | == Known Issues == | ||
=== Maxell Battery "Bombs" === | === Maxell Battery "Bombs" === | ||
; Causes | ; Causes | ||
: Apple placed a small lithium battery on the Performa 550/LC 550'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. '''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. | : Apple placed a small lithium battery on the Performa 550/LC 550'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. '''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 | ; Solutions | ||
: Macintosh LC IIIs/Performa 450s with exploded PRAM batteries are pretty much irreparable, save for replacing the entire Logic Board. | : Macintosh LC IIIs/Performa 450s with exploded PRAM batteries are pretty much irreparable, save for replacing the entire Logic Board. | ||
== Original Parts == | == Original Parts == | ||
=== Revision 820-0368-A Logic Board === | === Revision 820-0368-A Logic Board === | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 25: | Line 20: | ||
|- | |- | ||
|C1, C2 | |C1, C2 | ||
| | |2 | ||
|100 | |100 | ||
|6 | |6 | ||
| Line 34: | Line 29: | ||
|- | |- | ||
|C3, C5, C6, C11, C12, C13 | |C3, C5, C6, C11, C12, C13 | ||
| | |6 | ||
|47 | |47 | ||
|16 | |16 | ||
| Line 43: | Line 38: | ||
|- | |- | ||
|C9 | |C9 | ||
| | |1 | ||
|10 | |10 | ||
|16 | |16 | ||
| Line 51: | Line 46: | ||
|Unbranded | |Unbranded | ||
|} | |} | ||
<references /> | |||
[[Category:Computer]] | |||
[[Category:1990s]] | |||
[[Category:Apple]] | |||
{{DEFAULTSORT:Macintosh_Performa_550_and_LC_550}} | |||
Latest revision as of 20:26, 27 May 2023
The Macintosh Performa 550 (also branded as the Macintosh LC 550 and Macintosh Performa 560 Money Edition[1]) was sold from October 1993 until March 1995. The logic board is essentially the same one used in the Macintosh Color Classic II. 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 Performa 550/LC 550'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. 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 820-0368-A Logic Board
| RefDes | Qty | Capitance (μF) | Voltage (V) | Mount | Size | Type | Brand |
|---|---|---|---|---|---|---|---|
| C1, C2 | 2 | 100 | 6 | SMD | Aluminum Electrolytic | Unbranded | |
| C3, C5, C6, C11, C12, C13 | 6 | 47 | 16 | SMD | Aluminum Electrolytic | Unbranded | |
| C9 | 1 | 10 | 16 | SMD | Aluminum Electrolytic | Unbranded |
- ↑ Money And Apple Team Up To Offer Multimedia Personal-Finance Computer System (Press Release). January 17, 1994