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capacitor_relacement [2026/06/24 04:50] – [Clean The Board] wthwwcapacitor_relacement [2026/06/24 06:55] (current) – [Macintosh LC III, Performa 450 (820-0650-A)] Phipli
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 Again, practice on garbage boards if you are unsure of yourself.  When soldering new caps back on, pay special attention to the polarity of the capacitor and the markings on the logic board.  Often there will be a positive (+) symbol printed on the board.  The side of the tantalum capacitor that has a stripe is positive (+), so face that side of the capacitor toward the (+) symbol.  With surface-mount tantalums, it helps to apply some solder to both sides of the new capacitor first.  Then line the cap up on your logic board and simply heat both sides to make a connection. Again, practice on garbage boards if you are unsure of yourself.  When soldering new caps back on, pay special attention to the polarity of the capacitor and the markings on the logic board.  Often there will be a positive (+) symbol printed on the board.  The side of the tantalum capacitor that has a stripe is positive (+), so face that side of the capacitor toward the (+) symbol.  With surface-mount tantalums, it helps to apply some solder to both sides of the new capacitor first.  Then line the cap up on your logic board and simply heat both sides to make a connection.
  
-===== Capacitor Quantity and Type, for Macintosh Models =====+===== Capacitor Quantity and Type for Macintosh Models =====
  
 Some logic board revisions may have a different number of capacitors, so make sure to look first and verify this information.  If yours is different, please create an account here and add it to the page by clicking the edit button up on top.  Note that these numbers include capacitors only on the logic board and not, for example, in the power supply.  Post on the [[http://68kmla.net/bb|68kMLA Forums]] if you suspect you have bad caps in your power supply and would like help. Some logic board revisions may have a different number of capacitors, so make sure to look first and verify this information.  If yours is different, please create an account here and add it to the page by clicking the edit button up on top.  Note that these numbers include capacitors only on the logic board and not, for example, in the power supply.  Post on the [[http://68kmla.net/bb|68kMLA Forums]] if you suspect you have bad caps in your power supply and would like help.
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 Replace with Tantalum: Replace with Tantalum:
-  * 11x 47µF (?V) +  * 11x 47µF (25V) 
-  * 2x 10µF (?V)+  * 2x 10µF (16V)
  
 Replace with Electrolytic: Replace with Electrolytic:
-  * 3x 470µF (?V) +  * 3x 470µF (16V) 
-  * 1x 220µF (?V)+  * 1x 220µF (16V)
  
 ==== Macintosh IIsi (820-0301-A) ==== ==== Macintosh IIsi (820-0301-A) ====
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 ==== Macintosh LC III, Performa 450 (820-0650-B, Rev. D) ==== ==== Macintosh LC III, Performa 450 (820-0650-B, Rev. D) ====
 +
 +**Warning!**
 +The -5v Rail Capacitor on the LC III is labelled incorrectly on the silk screen and usually / always installed backwards from factory. While this wasn't ideal with a conventional electrolytic, when installing tantalum capacitors this can result in sudden and violent failure.
 +
 +**Prior to installing capacitor C22, use continuity testing on a multimeter to confirm the orientation.** As this is a negative power rail, the side with continuity to ground is the +ve side of the capacitor (i.e. the side marked with a band on a tantalum capacitor).
 +
 +See : [[https://68kmla.org/bb/threads/lciii-recap-apple-design-fault-47uf-reversed.27834/|https://68kmla.org/bb/threads/lciii-recap-apple-design-fault-47uf-reversed.27834/]]
  
 Replace with Tantalum: Replace with Tantalum:
-  * 5x 47µF (16V)+  * 5x 47µF (25V)
   * 5x 10µF (16V)   * 5x 10µF (16V)
   * 1x 100µF (6.3V)   * 1x 100µF (6.3V)
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 ==== Macintosh LC III, Performa 450 (820-0650-A) ==== ==== Macintosh LC III, Performa 450 (820-0650-A) ====
 Replace with Tantalum: Replace with Tantalum:
-  * 5x 47µF (16V) - C8, C19, C20, C21, C22+  * 4x 47µF (16V) - C8, C19, C20, C22 
 +  * 1x 47µF (25V) - C21
   * 5x 10µF (16V) - C2, C4, C5, C7, C18   * 5x 10µF (16V) - C2, C4, C5, C7, C18
   * 1x 100uF (6V) - C13   * 1x 100uF (6V) - C13
 +
 +Alternatively, it is acceptable to use 25V parts for all 47µF here to avoid ordering multiple different items.
  
 Gallery: Gallery:
capacitor_relacement.1782276651.txt.gz · Last modified: by wthww